Manuale d’uso / di manutenzione del prodotto MT2834BAI del fabbricante Multitech
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BA-Series Intelligent Data/Fax Modem User Guide.
User Guide 88312000 Revision A MultiModem II Models: MT2834BA/MT2834BAI MT1432BA/MT1432BAI/MT1432BA-Mac MT932BA/MT932BA This publication may not be reproduced, in whole or in part, without prior expressed written permission from Multi-Tech Systems, Inc.
Contents Chapter 1 - Introduction and Description 1.1 Introduction ................................................................................................................ ...................... 8 1.2 How T o Use This Manual ..................
Chapter 4 - Manual Dial and Automatic Answer 4.1 Introduction ................................................................................................................ ...................... 36 4.2 Dialing/On-Line/Answering ....................
Chapter 8 - Modem T esting 8.1 Introduction ................................................................................................................ ...................... 98 8.2 Local Analog Loopback T est/V .54 Loop 3 .......................
vi.
Chapter 1 - Introduction and Description.
8 MultiModemBA User Guide 1.1 Introduction Welcome to the world of data communications. You have acquired one of the finest intelligent desktop data/fax modems available today, the MultiModem II BA series modem, from Multi-Tech Systems.
9 Chapter 1 - Introduction and Description Chapter 5 - AT Command Mode Operation Chapter 5 may be the most important chapter of this manual. It begins with an introduction and discussion on Command Mode fundamentals. A flow chart is provided to illustrate Command Mode and On-Line Mode operation and the methods used in each mode.
10 MultiModemBA User Guide 1.3 Modem Features The MultiModem BA Series modem connections can be made on Public Switched Telephone Networks ( PSTNs ) and/or point-to-point 2-wire telephone type circuits. Your modem offers interactive automatic dialing, as well as Command Mode option configuration.
11 Chapter 1 - Introduction and Description 1.4 Fax Features Your modem meets the ITU V.17 standard for sending and receiving faxes. When linked to a compatible fax machine or modem, it can transmit faxes at 14,4 K bps.
12 MultiModemBA User Guide 1.5 T echnical Specifications Your data/fax modem meets the specifications listed below: Tradename MultiModem IITM Model Numbers 2834 Series: MT2834BA, MT2834BAI, MT2834BA-M.
13 Chapter 1 - Introduction and Description Data Compression All models: V.42 bis , (4:1 throughput) or MNP 5 (2:1 throughput) data compression Speed Conversion 2834 Series: Serial port data rates adj.
14 MultiModemBA User Guide Fax Carrier Frequencies All Models: V.21CH2 (Half Duplex) 1650Hz Mark, 1850Hz Space for Transmit Originate 1650Hz Mark, 1850Hz Space for Transmit Answer V.27ter 1800Hz Originate/Answer V.29 QAM 1700Hz Originate/Answer 2834 and 1432 Series: V.
15 Chapter 1 - Introduction and Description Receiver Sensitivity All models: -43 dBm under worst case conditions AGC Dynamic Range All models: 43 dB Interface All models: EIA RS-232C/ITU V.24 Connectors All models: One DB-25 RS-232C connector; two RJ11 for phone line/telephone set; power.
16 MultiModemBA User Guide 1.6 Power Power is supplied through an AC power transformer terminated with a standard two-prong plug. The transformer supplies low voltage AC to the modem, and plugs into any conventional 115 volt AC, 60 Hz, two-prong power outlet (240 volts AC, 50Hz, .
17 Chapter 1 - Introduction and Description (24.0) 24,000 bps. (2834 models only). This LED is lit when the modem is connected at 24,000 bps. Note: if the modem falls back to 21.6K bps while in V.34 mode, both the 24.0 and 19.2 LEDs light. (19.2) 19,200 bps.
18 MultiModemBA User Guide.
Chapter 2 - Installation and Connection.
20 MultiModemBA User Guide 2.1 What is in Y our Modem Package? Your MultiModem is made up of many components. Make sure you have them all before trying to operate your modem. MADE IN U.S.A MADE IN U.S.A FX EC TR OH 24 96 14.4 19.2 24.0 28.8 CD RD SD Fax V.
21 Chapter 2 - Installation and Connection 2.2 Installation The installation of the modem consists of making the physical connections necessary to render the modem functional with your computer. This includes making the proper serial, phone line, and power connections.
22 MultiModemBA User Guide PHONE LINE ON OFF POWER EIA RS232C VOLUME Figure 2-2. MultiModemBA/BAI Connections 4 Attach the EIA RS-232C connector on the modem to the serial port on your computer or terminal with an RS-232 (or V.24) cable (you supply). Refer to Figure 2-2.
23 Chapter 2 - Installation and Connection 2.3 Loading T rio DataF AX Software The following procedure will guide you through the installation of Trio DataFAX software.
24 MultiModemBA User Guide 10 Click Complete Installation and the installation introduction is presented. 11 Click Next Dialog and follow the on-screen instructions to load the software. Once the software has finished loading, the following dialog is displayed: 12 Choose Manual Selection of Modem and Ports , then click Next Dialog .
25 Chapter 2 - Installation and Connection 16 Follow the on-screen instructions and when you are finished, click Next Dialog . The following dialog is displayed: 17 Click OK, Exit the Installation Program . The Trio Applications program group is displayed.
26 MultiModemBA User Guide.
Chapter 3 - Software Configuration and Modem Basics.
28 MultiModemBA User Guide 3.1 Introduction Chapter 2 guided you through the installation of Trio communications software. If you are using a different software package, there are some points you should take into consideration.
29 Chapter 3 - Software Configuration 3.2.2 The 16550 UART and Windows 3.1 Windows 3.1 may cause a loss of data when communicating at high speed, even with a 16550 UART installed.
30 MultiModemBA User Guide 3.4 PC Initialization Strings We recommend the following initialization string for a MultiModem connected to a PC-compatible computer when sharing a line with a telephone: A.
31 Chapter 3 - Software Configuration 3.5 Macintosh Initialization Macintosh computers cannot use RTS/CTS hardware flow control without a serial cable wired for hardware control. The Macintosh 128 and 512 models cannot use RTS/CTS flow control at all.
32 MultiModemBA User Guide 3.6.3 File T ransfer Protocols When you upload or download files with your modem, the host computer will ask which file transfer protocol you want to use.
33 Chapter 3 - Software Configuration 3.8 Modem Basics You control your modem by issuing AT commands, setting S-Registers, and setting DIP-Switches. You can easily change the settings of your DIP-Switches, as they are located on the right side of your modem’s chassis.
34 MultiModemBA User Guide.
Chapter 4 - Manual Dial and Automatic Answer.
36 MultiModemBA User Guide 4.1 Introduction We’ll assume that yours is the very common application, where you are using a modem to dial up a remote computer. The modem has been factory preset for originating a call to a compatible baud modem (also set up for hardware flow control, V.
37 Chapter 4 - Manual Dial and Automatic Answer 4.3 Manual Call Origination You can use the modem to both originate and answer calls. To originate calls in Asynchronous mode, you will most likely use the modem's Command mode, and give the modem automatic dialing commands (we will delay our discussion of the Command mode until Chapter 5 ).
38 MultiModemBA User Guide 4.5 Manual Answering We have shown that the modem can automatically answer incoming calls. The MultiModem can also answer manually, under your control.
39 Chapter 4 - Manual Dial and Automatic Answer 4.7 Call T ermination There are a number of ways to terminate a call, or simply stated, hang up. They are: 1) Command Mode Control. To terminate a call by Command Mode, enter +++ATH then RETURN; or, send a BREAK signal followed by ATH and a RETURN.
40 MultiModemBA User Guide.
Chapter 5 - Command Mode.
42 MultiModemBA User Guide 5.1 Introduction AT commands are the means by which you, and your communications software, are able to communicate with and configure your modem. They enable you to establish, read, and modify parameters in addition to dialing.
43 Chapter 5 - Command Mode 5.1.2 Functional Modes The MultiModem can be in one of two functional states (see Figure 5-1). These are "Command mode" and "On-line mode" . (There is also an in-between state, "Wait-for-Carrier" , where the modem is out of Command mode but not yet really On-Line.
44 MultiModemBA User Guide 5.2 Summary of A T Commands A wide variety of autodial operations and modem options can be controlled when the modem is in Command Mode. Remember, nearly all commands begin with AT . These commands are organized into several functional groups.
45 Chapter 5 - Command Mode CONTROL RS232C &C Carrier Detect Control INTERFACE &D Data Terminal Ready Control &R Clear To Send Control &S Data Set Ready Control &RF CTS/RTS Control &SF DSR/CD Control CONFIGURE &E0 Normal Mode ERROR &E1 Auto-Reliable Mode CORRECTION &E2 Reliable Mode #L0 Negotiate V.
46 MultiModemBA User Guide EXECUTE %DF Format Line Probe Display (Graph or Table Format) LINE %DP Enable/Disable Reading Line Probe From DSP during handshake PROBE L9 Display of Signal Strength Inform.
47 Chapter 5 - Command Mode 5.3 Result Codes The Command mode provides you with several responses, or “Result Codes” , that can aid you in Command mode operation.
48 MultiModemBA User Guide "Standard AT" Result Codes 2834 Series TERSE VERBOSE TERSE VERBOSE 0 OK 11 CONNECT 4800 1 CONNECT 12 CONNECT 9600 2 RING 13 CONNECT 14400 3 NO CARRIER 19 CONNECT 1.
49 Chapter 5 - Command Mode 5.4 Dialing Commands 5.4.1 Dialing Action Commands Dial Command D The letter D in a command causes the modem to dial the telephone number immediately following it. For example, if you enter ATD5551212 and hit RETURN, the modem dials the number 555-1212.
50 MultiModemBA User Guide To activate DTR Dialing, enter AT$D1 and hit RETURN. The modem dials the phone number stored in the N0 location of memory when it receives a high DTR signal. DTR must remain high for the duration of the call, until disconnect.
51 Chapter 5 - Command Mode Automatic Pauses in Dialing , You can cause the modem to pause during the dialing sequence by entering a comma character where the pause is desired. This pause lasts two seconds. If a longer pause is desired, more than one comma may be entered consecutively, with each comma causing a two second pause.
52 MultiModemBA User Guide "Calling Card" Detect Tones $ The modem has the capability to detect AT&T "calling card" tones for the purpose of utilizing the user's calling card number to originate an on-line connection.
53 Chapter 5 - Command Mode 5.4.3 Phone Number Memory Commands Storing Phone Numbers D...N A telephone number and command line of up to sixty characters may be stored in the modem’s number memory. As many as ten of these numbers may be stored. Each number will be given a name, using the codes N0, N1, N2 up to N9.
54 MultiModemBA User Guide 5.4.4 Configuration and Default Storage Commands Store Configuration & S-Register Parameters in Non-Volatile Memory &W The modem can store configuration parameters and S-Register values in its nonvolatile read/write Random Access Memory (RAM) memory.
55 Chapter 5 - Command Mode Unix UUCP Spoofing $SP The modem can be configured in a Unix environment that employs ACK flow control as a means of monitoring data integrity. The modem can do “UUCP spoofing” , where the modem is able to generate ACKs at the DTE interface.
56 MultiModemBA User Guide 5.4.5 Command Response (Result Code) Commands Echo Command Mode Characters E If the modem is connected to a full-duplex computer, it may be necessary for the modem to be configured to echo back characters entered while in the Command Mode in order for them to be displayed.
57 Chapter 5 - Command Mode Result Codes (Basic and Extended) and Call Progress Selection X The X Command is used to select one of two possible dialing methods ( “dumb” or “smart” ), and to select various response combinations related to these methods.
58 MultiModemBA User Guide 5.4.6 Phone Line Conditioning Commands Guard Tones (Not Used in BAI Models) &G The &G command is used to control the presence or absence of guard tones from the transmitter when in Answer mode, at either 1200 or 2400 bps.
59 Chapter 5 - Command Mode Fallback Modes When On-Line #F If line conditions deteriorate, the modem automatically drops its transmission speed ( “fallback” ). The #F command controls the different ways the modem falls back. During operation, if the error rate becomes too great, the modem performs a retrain.
60 MultiModemBA User Guide Auto Speed Detect #A The function of the #A command is to detect and select the operational data rates (the “starting” speeds) with which the modem uses for initial handshake and speed selection.
61 Chapter 5 - Command Mode 5.4.7 RS-232C Interface Control Commands Carrier Detect Control &C The &C command allows you to control the status of the Carrier Detect signal (CD-Pin 8) on the RS- 232C line.
62 MultiModemBA User Guide Data Set Ready Control &S The &S command allows you to control the status of the Data Set Ready signal (DSR - pin 6) on the RS-232C interface.
63 Chapter 5 - Command Mode 5.4.8 Error Correction Commands You can use AT commands to place your modem one of three V.42 (error correction) modes of operation. These are the Normal, Auto-Reliable, and Reliable modes. Normal Mode &E0 In Normal mode of operation, the modem’s V.
64 MultiModemBA User Guide V.42 Mode Select #L The V.42 standard implements both MNP Class 3 & 4 and LAP-M error correction methods. The V.42 Mode Select command (#L) selects which type of error correction (MNP or LAP-M) your modem uses for transmissions.
65 Chapter 5 - Command Mode Enable/Disable Auto Reliable Fallback Character $F In Auto-Reliable mode, the modem is given four seconds to establish a Reliable connection.
66 MultiModemBA User Guide 5.4.9 Flow Control Commands Flow control refers to the techniques used by computer devices to stop and restart the flow of data to and from each other. Flow control is necessary so that a device does not receive more data than it can handle.
67 Chapter 5 - Command Mode Xon/Xoff Pass-Through &E7 So far, you have had three choices to make regarding pacing: 1. You can set the modem to respond to Xon/Xoff pacing. 2. You can set the modem to respond to RTS pacing. 3. You can set the modem to ignore pacing completely.
68 MultiModemBA User Guide Normal Mode Modem Flow Control On &E11 When two MultiModems are connected in Normal mode (not using error correction), Xon/Xoff can be used to control the flow of data between the modems. Flow Control can be turned on or off with the Normal Mode Modem Flow Control commands.
69 Chapter 5 - Command Mode 5.4.10 Compression, Error Correction, Flow Control, Pass- Through and Pacing Commands The modem has a variety of commands to control its error correction and data compression options. These additional commands are listed below.
70 MultiModemBA User Guide 5.4.1 1 Speed Conversion Commands Speed conversion is a necessary part of data compression since data must be presented to the modem faster than it can handle data, if data compression is to be effective.
71 Chapter 5 - Command Mode 1432 Series: AT$MB75 = CCITT V.23 AT$MB300 = 300 bps AT$MB1200 = 1200 bps AT$MB2400 = 2400 bps AT$MB4800 = 4800 bps AT$MB9600 = 9600 bps AT$MB14400 = 14400 bps The factory default is 14400 bps. 932 Series: AT$MB75 = CCITT V.
72 MultiModemBA User Guide Serial Port Baud Rate $SB The $SB command presets the speed of the modem’s serial (RS-232C) port, in both Originate and Answer modes.
73 Chapter 5 - Command Mode 5.4.12 Immediate Action Commands Help Screens $H The Help command is designed to give you short explanations on how to use each modem command. The Help command can be quite useful if your manual is not handy and you are in the middle of a communications session.
74 MultiModemBA User Guide Listing On-Line Diagnostics L8 The L8 command displays the current on-line CONNECT status of the modem. This display can be printed and used as a modem status report or as diagnostic information (such as when calling Tech Support).
75 Chapter 5 - Command Mode Force Answer Mode A You can force the modem into Answer mode with the modem’s A command. Entering ATA when in Command mode immediately brings your modem off-hook, out of Command mode and into On-Line Answer mode, and causes it to transmit its carrier signal over the phone line.
76 MultiModemBA User Guide.
Chapter 6 - S-Registers.
78 MultiModemBA User Guide 6.1 Introduction Certain Command Mode configurations are stored in memory registers called, S-Registers. The S command is used to assign a value to, and to read the current value of an S-Register.
79 Chapter 6 - S-Registers S4 Line Feed Character Unit: ASCII Character Range: 0-127 Default: 10 (^J) Description: S4 defines the character recognized as Line Feed. S3 may be set for any ASCII character. S5 Backspace Character Unit: ASCII Character Range: 0-127 Default: 8 (^H) Description: S5 defines the character recognized as BACKSPACE.
80 MultiModemBA User Guide S9 Carrier Detect Response Time Unit: 100 mSec. Range: 1-255 Default: 6 Description: S9 sets the time delay between when the modem first detects a valid incoming carrier signal and when the modem turns on its Carrier Detect circuit.
81 Chapter 6 - S-Registers S15 Callback Time Delay Unit: Seconds Range: 10-255 Default: 20 Description: S15 defines the time delay between Callback attempts after initial passwords have been exchanged between modems. Refer to Chapter 7 for Callback Security information.
82 MultiModemBA User Guide S26 Failed Password Attempts Unit: 1 failed attempt Range: 0-255 Default: 0 Description: S26 counts the number of times there has been a failed password attempt.
83 Chapter 6 - S-Registers S34 Buffer Length of Command Mode...After On-line Escape Sequence Unit: ASCII Character Range: 0-60 Default: 10 Description: If the number of characters after AT exceeds the S34 buffer length value, the buffer is cleared and the escape sequence is aborted.
84 MultiModemBA User Guide 6.2 Reading and Assigning S-Register V alues The S command is used to assign a value to, and to read the current value of, an S-Register. To read an S-Register value, enter the letter S followed by the S-register number and a question mark ( ? ), then hit RETURN.
85 Chapter 6 - S-Registers 6.3 A T Command and S-Register Summary The vast majority of installations are similar, with the modem being used to dial up a remote installation where the call is automatically answered. Your modem has a default configuration to dial another modem that supports error correction, data compression and flow control.
86 MultiModemBA User Guide.
Chapter 7 - Callback Security and Remote Configuration.
88 MultiModemBA User Guide 7.1 Introduction This chapter describes how the MultiModem’s Callback and Remote Configuration features operate. These features use a multilevel security system, which involves the use of LOGIN Passwords, Setup Passwords and Remote Escape Characters.
89 Chapter 7 - Callback Security and Remote Configuration 7.3 Remote Configuration Description The Remote Configuration feature is a network management tool that allows you to configure modems remotely.
90 MultiModemBA User Guide To turn your modem's Callback Security feature on and off: 7. If you want Callback Security with both remote and local password security, enter AT#DB1 and hit RETURN. You must turn on Callback Security to be able to enter dial back phone numbers.
91 Chapter 7 - Callback Security and Remote Configuration The + and/or - characters entered before the phone number are optional. The + (Deposit Number) code allows a caller to enter the number he or she wishes the Callback modem to call back when the caller uses a particular password (Step 3 of Table 7-3).
92 MultiModemBA User Guide 7.3.2 Remote Configuration Procedures The procedures for using the Remote Configuration features are the same whether or not a call originates from the remote modem. Once the modem is on-line, perform the procedures in Table 7-4.
93 Chapter 7 - Callback Security and Remote Configuration 7.4 Remote Configuration and Callback Security A T Commands The following AT commands are used with Remote Configuration and Callback Security features.
94 MultiModemBA User Guide Erase Callback Password #RCBNxx This command erases the single callback password specified by xx (0 through 29). Erase Callback Phone Number #RDNxx This command erases the single phone number specified by xx (0 through 29).
95 Chapter 7 - Callback Security and Remote Configuration 7.5 Remote Configuration/Callback Security S-Registers The following S-Registers are used with Remote Configuration and Callback Security features. Remote Configuration Character (S13) S13 defines the modem’s remote configuration escape character.
96 MultiModemBA User Guide.
Chapter 8 - Modem T esting.
98 MultiModemBA User Guide 8.1 Introduction Each time you power up the MultiModem, it performs an automatic self- test to ensure proper operation. The modem also has four diagnostic test features: Local Analog Loopback, Digital Loopback (remote/automatic), Digital Loopback (local/manual) and a modem Back-to-Back test.
99 Chapter 8 - Modem Testing 8.2 Local Analog Loopback T est/V .54 Loop 3 In this test, data from your computer or terminal is sent to your modem's transmitter, converted into analog form, looped back to the receiver, converted into digital form and then received back at your monitor for verification.
100 MultiModemBA User Guide 8.3 Digital Loopback T est/V .54 Loop 2 (Local/Manual) In this test, your modem must be On-Line with another modem that can respond to a request for Digital Loopback, such as another MultiModem.
101 Chapter 8 - Modem Testing 8.4 Digital Loopback T est/V .54 Loop 2 (Remote/Automatic) In this test, your modem must be On-line with another modem set up to respond to a request for Digital Loopback, such as another MultiModem. With the MultiModem, this ability to respond is controlled by the &T command.
102 MultiModemBA User Guide 8.5 Back-to-Back T est This test lets you connect two MultiModems with an RJ-11 cable to verify proper operation. Using a modem that is known to be operational, you can test a second modem that is suspect. 1. Plug the modular ends of an RJ-11 cable into both MultiModem’s LEASE jack connectors.
103 Chapter 8 - Modem Testing 8.6 Synchronous Mode T esting The following tests must be run with your modem in Synchronous mode (DIP Switch #12 in the Up (OPEN) position), DIP Switch #9 controls the modem’s Synchronous mode testing function. (Refer to Chapter 9 for DIP Switch information.
104 MultiModemBA User Guide 8.8 Digital Loopback T est (Local/Manual) (Synchronous Mode) This test must be run when you have a data connection with another modem. If a Local Analog Loopback Test resulted in errors, and this test passes without errors, then the problem exists in your computer-to-modem connection.
105 Chapter 8 - Modem Testing 8.9 Digital Loopback T est (Remote/Automatic) (Synchronous Mode) This test must be run when you have a data connection with another modem. In this test, data is passed to the remote modem and is looped back to the local modem (as if an ATU2 command was issued in Asynchronous test mode), as shown in Figure 8-7.
106 MultiModemBA User Guide.
Chapter 9 - DIP-Switch Settings.
108 MultiModemBA User Guide 9.1 Introduction There are several DIP-Switch options on the modem’s printed circuit (PC) board. The DIP-Switches are accessible through a cut-out on the side of the modem. This chapter explains the modem’s printed-circuit board options.
109 Chapter 9 - DIP-Switch Settings 9.2 DIP-Switch Option Settings Switch #1 Forced DTR -- "DTR" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) The modem must have a high DTR signal in order to operate. DTR is provided to the modem by the terminal or computer to which it is attached, through pin 20 of the RS-232C/V.
110 MultiModemBA User Guide Switch #3 dB Transmission Levels (Asynchronous/Synchronous Mode/Leased Line) 2834 Series: DIP-Switch #3 adjusts dB transmission levels required by some phone carriers. Place DIP-Switch #3 in the DOWN position to enable -9 dB transmission.
111 Chapter 9 - DIP-Switch Settings Switch #5 Enable/Disable Auto-Answer - "Ans" (Asynchronous Mode/Synchronous Mode/Dial-Up) In some originate-only applications, you may wish to disable the modem’s automatic answering capabilities.
112 MultiModemBA User Guide Switch #7 Request To Send Forced - "RTS" (Asynchronous/Synchronous Mode/Leased Line/Dial-Up) If your computer or terminal uses RTS-CTS protocol (typically used in some synchronous applications, but also if using hardware pacing for V.
113 Chapter 9 - DIP-Switch Settings Switch #11 "AT" Responses/Multi-Tech Responses (Asynchronous Mode/Leased line/Dial-Up) In Asynchronous mode, you can set the modem to respond with Result .
114 MultiModemBA User Guide 1432 Series: 14400 bps Operation = Switch #13 UP and Switch #14 UP 9600 bps Operation = Switch #13 DN and Switch #14 UP 4800 bps Operation = Switch #13 UP and Switch #14 DN.
115 Chapter 9 - DIP-Switch Settings 9.3 Speaker V olume Control You can adjust the volume of the modem’s phone-line monitor speaker with a volume control knob, located on the back of the modem next to the RS-232C connector (see Figure 9-1 for location).
116 MultiModemBA User Guide #11 Internal*/External Clocking UP (Synchronous) DOWN* #12 Sync/Async Mode* UP DOWN* * Factory Default Setting DIP Switches #13-14 Note: The modem baud rate command ( $MBn ) overrides the setting of these speed selection switches (DIP switches #13 and #14).
Chapter 10 - W arranty , Service and T ech Support.
118 MultiModemBA User Guide 10.1 Introduction This chapter starts out with statements about your modem's 5-year warranty. The next section, Tech Support, should be read carefully if you have questions or problems with your modem.
119 Chapter 10 - Warranty, Service and Tech Support 10.3 T ech Support Multi-Tech has an excellent staff of technical support personnel available to help you get the most out of your Multi-Tech product. If you have any questions about the operation of this unit, call 1-800-972- 2439.
120 MultiModemBA User Guide 10.5 The Multi-T ech BBS For customers who do not have Internet access, Multi-Tech maintains a bulletin board system (BBS) that mirrors its FTP site. Information available from the BBS includes new product information, product upgrade files, and problem-solving tips.
121 Chapter 10 - Warranty, Service and Tech Support 10.5.2 Upgrading the MultiModem The MultiModem has a Flash PROM which contains firmware code for the hardware and DSP code for the digital signal processor chips. At various times, Multi-Tech may add enhancements and/or fixes to the firmware.
122 MultiModemBA User Guide 10.8 About Ordering Accessories SupplyNet, Inc. can supply you with replacement transformers, cables and connectors for select Multi-Tech products. You can place an order with SupplyNet via mail, phone, fax or the Internet at: Mail: SupplyNet, Inc.
Appendixes.
124 MultiModemBA User Guide Appendix A - T roubleshooting Your modem was thoroughly tested at the factory before it was shipped. If you are unable to make a successful connection or if you experience data loss or garbled characters during your connection, it is possible that the modem is defective.
125 Appendix A - Troubleshooting • If you don’t get an OK , the problem may still be in the communications software. Make sure you have done whatever is necessary in your software to make a port connection. Not all communications programs connect to the COM port automatically.
126 MultiModemBA User Guide The Modem Dials But Cannot Make a Connection There can be several reasons the modem fails to make a connection. Possibilities include • lack of a physical connection to the telephone line. • a wrong dial tone. • a busy signal.
127 Appendix A - Troubleshooting The Modem Disconnects While On-line • If you have call waiting on the same phone line as your modem, it may interrupt your connection when someone tries to call you. If you have call waiting, disable it before each call.
128 MultiModemBA User Guide I Am Losing Data • If you are using data compression and a high speed serial port, set the serial port baud rate to four times the data rate. • Your UART may not be reliable at serial port speeds over 9600 bps or 19,200 bps.
129 Appendix B - ASCII Conversion Chart Appendix B - ASCII Character Code/Hex/Decimal Conversion Chart CTRL CODE HEX DEC CODE HEX DEC CODE HEX DEC CODE HEX DEC @ NUL 00 0 SP 20 32 @ 40 64 60 96 A SO H.
130 MultiModemBA User Guide Appendix C - Dial Pulse and T one-Dial Frequencies Dial Pulses Closed Open B A Digit 2 Digit 1 In the example above, the digit 2 is pulse dialed, followed by the digit 1. Each pulse consists of an A mSec. open and a B mSec.
131 Appendix D - AT Command Summary Appendix D - Command Summary Command Values Description AT Attention Code that precedes most command strings except A/, A: and Escape Codes.
132 MultiModemBA User Guide Command Values Description B n n = 0 or 1 * B0 selects V.21 answer tone. B1 selects Bell answer tone. &B n n = 0 or 1 * &B0 means normal transmit buffer size. &B1 means reduced transmit buffer size. &BS n n = 0 or 1 &BS0 means maximum transmit block size of 64 characters.
133 Appendix D - AT Command Summary Command Values Description &E n n = 0 thru 15 &E0 means no error correction. * &E1 means V.42 Auto-reliable Mode. &E2 means V.42 Reliable Mode. &E3 means no modem-initiated flow control. * &E4 means CTS modem-initiated flow control.
134 MultiModemBA User Guide Command Values Description $H n n = 1 thru 3 $H1 brings up Help Screen #1. $H2 brings up Help Screen #2. $H3 brings up Help Screen #3. I n n = 0,1or 2 I0 requests modem ID #. I1 requests firmware revision #. I2 for MTS internal use.
135 Appendix D - AT Command Summary Command Values Description 932 Series: $MB75 selects CCITT V.23 mode. $MB300 selects 300 bps on-line. $MB1200 selects 1200 bps on-line. $MB2400 selects 2400 bps on-line. $MB4800 selects 4800 bps on-line. * $MB9600 selects 9600 bps on-line.
136 MultiModemBA User Guide Command Values Description S r? r = 0-11, 13, Reads value of Register “r” and displays 15-19, 24-26, value in 3-digit Decimal format. 30, 32 or 34... $SB n n = speed 2834 Series: $SB300 selects 300 bps at serial port. $SB1200 selects 1200 bps at serial port.
137 Appendix D - AT Command Summary Command Values Description U n n = 0, 1, 2, or 3 U0 places modem in Analog Loop Originate Mode. U1 places modem in Analog Loop Answer Mode. U2 places modem in Remote Digital Loopback test mode. U3 places modem in Local Digital Loopback test mode.
138 MultiModemBA User Guide Command Description +++AT<CR> In-band Escape Sequence. Places modem in Command Mode while still remaining On-Line. Enter +++ followed by the letters A and T, up to ten command characters, and a RETURN. BREAK AT<CR> Out-of-band Escape Sequence.
139 Appendix D - AT Command Summary Password Command Summary Command Description #Ixxxxxxxxxx Login Password is any keyboard characters (x) (upper/lower case sensitive), minimum 6 and maximum 10 characters. The default Login Password is #IMULTI-TECH .
140 MultiModemBA User Guide Appendix E - DIP-Switch Summary Asynchronous Mode DIP-Switch Condition Effect #1 UP* DTR dependent on interface Down DTR forced On at all times #2 UP* Hardware Flow Control.
141 Appendix E - DIP-Switch Summary Synchronous Mode DIP-Switch Condition Effect #1 UP* DTR Dependent On interface Down DTR forced On at all times #2 UP* SDLC Mode On Down BSC Mode On #3 UP Command Mo.
142 MultiModemBA User Guide DIP Switches #13-14 Note: The modem baud rate command ( $MBn ) overrides the setting of these speed selection switches (DIP switches #13 and #14). 2834 Series: SWITCH CONDITION EFFECT #13/#14 UP/UP* 28.8 K bps Operation #13/#14 DOWN/UP 19.
143 Appendix F - S-Register Summary Appendix F - S-Register Summary S-REGISTER UNIT RANGE DEFAULT DESCRIPTION S 0 1 ring 0 -25 5 1 Sets number of rings before modem answers. S 1 1 ring 0-255 0 Counts rings which have occurred. S 2 ASCII 0-127 43 Sets Escape Code character (default is plus + sign).
144 MultiModemBA User Guide S-REGISTER UNIT RANGE DEFAULT DESCRIPTION S 29 1 1-255 20 Specifies the amount of idle time can elapse between AT commands after the SETUP password has been entered S 30 min 0-255 0 Inactivity timer used to disconnect modem.
145 Appendix G - Result Code Summary Appendix G - Result Code Summary TERSE (Digit) VERBOSE (Words) Effect 0 OK Command was executed without error; ready for next command. 1 CONNECT Modem has detected carrier and gone on-line. 2 RING Modem has detected ring caused by incoming call.
146 MultiModemBA User Guide Note: If the modem is used in MNP Reliable mode, the following responses change: 1R CONNECT RELIABLE 5R CONNECT 1200 RELIABLE 9R CONNECT 2400 RELIABLE 11R CONNECT 4800 RELI.
147 Appendix H - V.25bis Operation Appendix H - V .25bis Operation Chapter 5 described a set of commands which let the modem dial, hang-up, and be configured for various applications. However, these commands, the AT command set, are only functional when the DTE transmits data asynchronously.
148 MultiModemBA User Guide Another asynchronous mode concern is the problem of connecting at a different speed than the speed at which the serial port is set.
149 Appendix H - V.25bis Operation V.25bis Mode AT Commands The following commands will either alter standard V.25 bis behavior (so you must be careful in their use) or they are not allowed, as indicated. All other commands can be used in V.25 bis operation.
150 MultiModemBA User Guide V.25bis AT Commands The AT commands associated with V.25 bis mode are described as follows. Note that one command enables and disables V.25 bis mode and the rest are only operable in the V.25 bis mode. Enable/Disable V.25bis Mode ($V) Command The function of the $V command is to select the V.
151 Appendix H - V.25bis Operation Listing Delayed Phone Numbers (RLD) Command When a phone number is dialed by a CRN command and a connection is not made, the number is entered in the modem's V.25 bis Delayed Number list along with the number of retry attempts.
152 MultiModemBA User Guide ITU V.25bis Country Specific Information Due to the flexibility of the V.25 bis standard, each country may establish specific regulations governing the way operations are handled. The purpose of this document is to detail each country's specific regulations that affect operation of V.
153 Appendix H - V.25bis Operation 4. France a) Command/Indication modification (none) b) Delay and Forbidden list behavior 1. 2 min. delay after 1st call, 4 after 2nd, 6 after 3rd, etc. 2. After 5 retries, the number is put on the forbidden list 3. The number remains on the forbidden list forever 4.
154 MultiModemBA User Guide Appendix I - MultiModemBA Cables These cables connect your modem to your terminal or computer’s serial port. 25-PIN DTE Connector 25-PIN DCE Device 2T D 3R D 4R T S 5 CTS 6 DSR 7G N D 8C D 20 DTR 22 RI TD 2 RD 3 RTS 4 CTS 5 DSR 6 GND 7 CD 8 DTR 20 RI 22 Figure I-1.
155 Appendix J - RS-232C Interface Specifications 25 POS MALE DSUB 8 POS. MINI-DIN TD 2 RCV 3 RTS 4 CTS 5 GND 7 1 Handshake Out 2 Handshake In 4G N D 8G N D 3T D 5 RCV 876 54 3 21 8 POS.
156 MultiModemBA User Guide Appendix J - RS-232C Interface Specifications The modem's RS-232C interface circuits have been designed to meet the electrical specifications given in EIA (Electronic Industries Association) RS-232C standards.
157 Appendix J - RS-232C Interface Specifications Functional Description of RS-232C Signals: Transmitted Data - Pin 2, SD (BA) Direction: to modem Signals on this circuit are generated by the customer's terminal and transferred to the transmitter of the modem.
158 MultiModemBA User Guide Test Voltage - Pin 9, XV Direction: from modem The XV lead has 330 ohms of resistance to +12 volts DC. This lead may be used to strap other signals high.
159 Appendix J - RS-232C Interface Specifications External Transmit Clock - Pin 24, XTC Direction: to modem Supplies the same function as transmit clock on Pin 15.
160 MultiModemBA User Guide Appendix K - Regulatory Information Compliance with European Community Requirements EMC, Safety and Terminal Directive Compliance The CE mark is affixed to this product to .
161 Appendix K - Regulatory Information FCC Regulations for Telephone Line Interconnection 1. This equipment complies with Part 68 of the Federal Communications Commission (FCC) rules. On the outside surface of this equipment is a label that contains, among other information, the FCC registration number and ringer equivalence number (REN).
162 MultiModemBA User Guide Canadian Limitations Notice Notice: The ringer equivalence number (REN) assigned to each terminal device provides an indication of the maximum number of terminals allowed to be connected to a telephone interface.
163 Index Index Symbols &E0 .................................................................... 32 &E1 .................................................................... 32 &E14 ..........................................................
164 MultiModemBA User Guide Dialing a Stored Number (N) .............................. 49 Dialing/On-Line/Answering ................................. 28 Digital Loopback T est ................................ 98, 1 12 Dimensions ......................
165 Index Modem Dials But Cannot Make a Connection .. 1 26 Modem Disconnects While Online ................... 127 Modem Does Not Respond to Commands ....... 124 Modem Reset (Z) ............................................... 54 Modem-Initiated Flow Control Commands .
166 MultiModemBA User Guide self-test ......................................................... 124 T ime Elapse for Escape Sequence .................... 8 2 T ime for Carrier (Abort Timer) ............................ 79 T one Dialing: T one Spacing and Duration .
Un punto importante, dopo l’acquisto del dispositivo (o anche prima di acquisto) è quello di leggere il manuale. Dobbiamo farlo per diversi motivi semplici:
Se non hai ancora comprato il Multitech MT2834BAI è un buon momento per familiarizzare con i dati di base del prodotto. Prime consultare le pagine iniziali del manuale d’uso, che si trova al di sopra. Dovresti trovare lì i dati tecnici più importanti del Multitech MT2834BAI - in questo modo è possibile verificare se l’apparecchio soddisfa le tue esigenze. Esplorando le pagine segenti del manuali d’uso Multitech MT2834BAI imparerai tutte le caratteristiche del prodotto e le informazioni sul suo funzionamento. Le informazioni sul Multitech MT2834BAI ti aiuteranno sicuramente a prendere una decisione relativa all’acquisto.
In una situazione in cui hai già il Multitech MT2834BAI, ma non hai ancora letto il manuale d’uso, dovresti farlo per le ragioni sopra descritte. Saprai quindi se hai correttamente usato le funzioni disponibili, e se hai commesso errori che possono ridurre la durata di vita del Multitech MT2834BAI.
Tuttavia, uno dei ruoli più importanti per l’utente svolti dal manuale d’uso è quello di aiutare a risolvere i problemi con il Multitech MT2834BAI. Quasi sempre, ci troverai Troubleshooting, cioè i guasti più frequenti e malfunzionamenti del dispositivo Multitech MT2834BAI insieme con le istruzioni su come risolverli. Anche se non si riesci a risolvere il problema, il manuale d’uso ti mostrerà il percorso di ulteriori procedimenti – il contatto con il centro servizio clienti o il servizio più vicino.
