LC 144 VF HIGH SPEED MODEM for • • Data Transmission • • Fax • • Speech Messages User Manual CREATIX Polymedia GmbH Fasanerieweg 15 66121 Saarbrücken Dieses Dokument wurde erstellt mit FrameMaker 4.0.4.
CREATIX Polymedia GmbH, Saarbrücken 1994 This handbook is protected by copyright. It must not be copied, reproduced, translated or transmitted in electronic media, in whole or in part. Accuracy of the information is not guaranteed. Any mention in this handbook of products made by other manufacturers is for information purposes only and represents no misuse of trademarks. jüt mv205a0.
Table of contents Chapter 1 INTRODUCTION 1-1 What is a Modem ? 1-1 About this Modem 1-1 Special Features 1-2 General Description 1-2 Installation Instructions 1-2 Basic Adjustments 1-3 Chapter 2 AT COMMANDS: DATA MODEM 2-1 Guidelines for Using AT Commands 2-1 AT - Attention Code 2-4 The ESC Sequence 2-4 A - Answer Mode 2-4 A/ - Repeat Last Command Line 2-5 B - BELL/CCITT Standard 2-5 D - Automatic Dialling and Dialling Parameters 2-5 E – Echo Function 2-6 F – Determining Type of Modulation and Speed
Z – Reset/Load a Stored Profile 2-10 &C – M5 Control Line 2-10 &F – Loading the Factory Settings 2-10 &G – Guard Tone 2-11 &K – Flow Check 2-11 &M – Asynchronous Dialling / Synchronous Data Transmission &Q – Synchronous / Asynchronous 2-11 &R – Control Lines S2 and M2 2-12 &S – Control Line M1 (107/DSR) 2-12 &T – Modem Test Functions 2-12 &V – Displaying the Current Configuration 2-13 &W – Storing a set Profile 2-13 &X – Setting the Clock Signal in Synchronous Mode 2-14 &Y – Selecting a Start Configuration
Chapter 3 DIALLING WITH V.25.
S37 – Speed on the Telephone Line 5-11 S38 – Delay before Hanging Up 5-11 S39 – Flow Control 5-11 S40 – General Options 5-12 S41 – General Options 5-12 S46 – Authorising a Data Compression 5-13 S48 – Directing the V.
Chapter 1 INTRODUCTION The Data Modem you have purchased represents the latest state of the art in data communication; its comprehensive facilities provide all you will need for professional data transfer purposes. In data modem mode, you can achieve active transfer speeds of up to 57 600 bps and up to 14 400 bps in fax mode. This handbook, together with the descriptive information provided with your communications software, gives all the information you need to install and operate the equipment.
Special Features Fax Transmission and Reception at up to 14 400 bps • • Automatic recall of Stored Telephone Numbers, with • Password Protection • Remote Configuration • Number Storage for 20 Telephone Numbers • Voice Mode for Onward Transfer of Voice • Information (Option) • Compression/Decompression of digitized speech General Description Synchronous or Asynchronous • • Auto-protocol: the Modem adjusts automatically to all Full Duplex Trans• • • • • • • mission Protocols and Speeds MNP 5 and V.
Basic Adjustments To make it easier for you to use your modem, two basic settings have been made at the factory, which are suitable for the vast majority of connection systems. These settings can be activated with the “&F” command. In the fax mode or voice mode, the relevant software will carry out control of modem settings for you. • for BTX Operation (Datex-J with 2400 bps), select AT&F1 in the software as the initialisation sequence • For general Remote Data Transmissions select AT&F0.
1-4 INTRODUCTION
Chapter 2 AT COMMANDS: DATA MODEM Guidelines for Using AT Commands The modem is programmed with AT commands from the data terminal equipment (computer, PC or terminal) and thus also receives instructions to cover automatic dialling. The communications or fax software (Voice Software as an option) will carry out most of these operations for you, so that in general circumstances you do not need to have a detailed understanding of the commands which are described below.
Table 1 Modem Commands Standard Commands ATA A/ ATB ATD ATE ATF ATH ATI ATL ATM ATO ATP ATQ ATS ATT ATV ATW ATX ATY ATZ +++ AT&C AT&F AT&G AT&K AT&M AT&Q AT&R AT&S AT&T AT&V AT&W AT&X AT&Y AT&Z Answer mode: Modem monitors telephone line Repeat last command line; entered without “AT” Switching between BELL/CCITT Standards at 300 or 1200 bps Enter automatic dialling Controlling repeat of modem commands on screen Determine type of modulation and speed Break off an existing connection Information on Modem pr
Extended MNP- and V.42bis-Commands AT\A Determining Data Block Size with MNP operation AT\B Sending a Break signal to the remote modem AT\F Display stored telephone numbers AT\G Modem-modem flow check (XON/XOFF) AT\J Adjusting computer/modem speed to the modem/modem speed AT\K Effects of the Break Signal AT\L MNP Block/Stream mode AT\N Switching between Direct, Normal and MNP modes AT\S Displaying current modem configuration on screen AT\W Authorise V.
AT - Attention Code The AT (Attention) Code, which introduces each command line, can be entered in upper-case or lower-case characters. Several commands (separated by spaces if desired) can be positioned one after another, in one line. A command line must end with the ASCII character which is stored in the S3 or S4 Register (or with both together). The standard value for S3 is Carriage Return (=13 decimal) and Line Feed (=10 decimal) for S4.
A/ - Repeat Last Command Line The A/ command causes the modem to repeat the command line which is stored in the command buffer, e.g. it will dial again, if the line is busy. This command is entered without AT and no reply is issued. ➮ A command line remains until the modem receives a new command. The data format should not be modified in the meantime. B - BELL/CCITT Standard The B command permits change-over between CCITT and Bell standards at 300 or 1200 bps.
Example of how to set up a Dial Command ATD T0 , P 02212971 With this, a private automatic branch exchange using tone-dialling dials zero, in order to obtain an exchange line. The modem then waits one second for the “line-free” tone so that it can dial the rest of the telephone number in pulse-dialling mode Example of the Automatic Dialling Function ATD T0 , P 02212971;H If you lift the handset during the dialling process, you can take over the connection yourself.
H – Switch Hook Check (Replace Handset) The H command will break off the existing telephone line connection (the modem “hangs up”) and the connection to the remote modem is cut off. After the H command, any other commands in the same line are ignored. ➮ This command can only be entered after an existing data link has been quitted by using the Esc sequence.
O – Return to On-Line Operation The O command causes the modem to return to Online mode, which can be left temporarily, using the Esc sequence. P – Selecting Pulse Dialling This command specifies pulse-dialling as the standard dialling procedure, until the modem receives a Tone-dialling parameter in a dialling command, or until the T command is received.
ATW1 ATW2 Once the connection has been established, messages follow sequentially regarding the speed on the telephone line, the Error Protocol and the interface speed Once the connection has been established, only the speed on the telephone line is advised X – Extended Connect Messages; Making Connections The X command determines which modem messages are authorised. Messages 0 to 4 are basic and are always issued.
Z – Reset/Load a Stored Profile The Zn command is used to carry out a Reset of an active configuration profile. In this procedure, the NVRAM values are written into the relevant Registers and the remaining parameters are changed again to the factory settings. You use the n parameter to select one of the configuration profiles which has been stored with &W (n=0,1). Any command following the Z command in the same command line will be ignored.
&G – Guard Tone In the Answer mode (upper channel transmission), the unit can send a Guard tone which in certain circumstances is a requirement for connections to the UK from abroad. With Bell 212A and Bell 103, no Guard tone is transmitted. AT&G0,1 Guard tone Off (factory setting) AT&G2 1800 Hz Guard tone &K – Flow Check This command determines the type of computer/modem flow check: AT&K0 No flow check authorised AT&K3 RTS/CTS flow check authorised (standard for data modem operation), (factory setting).
AT&Q5 AT&Q6 The modem attempts to create a data link with Error correction. You can also specify in Register S36 whether the modem should go off-line or create an asynchronous link, if this is unsuccessful. Asynchronous operation in “Normal” mode. (factory setting) &R – Control Lines S2 and M2 In asynchronous operation (see also &M0 command), the M2 control line (106/ CTS) is always set up, whether in command mode or in data mode.
AT&T6 Enquiry for a remote digital test loop. For this, the Esc sequence must be entered in an existing connection and AT&T4 must be active at the remote modem AT&T7 Enquiry for a remote digital test loop with Self-Test (see &T6). The “Self-Test” consists of a test sample, which is sent locally. At the end of this test, the number of errors detected will be reported to the computer.
&X – Setting the Clock Signal in Synchronous Mode The &X command determines down how the Clock Signal is produced. AT&X0 The modem produces its own send-pulse (factory setting) AT&X1 The modem awaits the send-pulse from the computer AT&X2 The modem produces the send-pulse from the pulse which it receives (pulse loop). This command must not be active simultaneously with two connected modems.
\F – Displaying the Telephone Number Store The command AT\F displays the telephone numbers stored with AT&Z. \G – Modem/Modem Flow Check The \G command determines whether the modem/modem Flow Check is switched on during a “Normal” connection. This Flow Check supports the modem, if data are sent more quickly than they can be handled. If the MNP buffer is full, it will send an XOFF signal (13A decimal) to the computer, so that it will interrupt the data transmission.
\K – Type of Break Control The \K command determines how the modem by-passes with a Break signal.
AT\N3 Depending on the remote modem setting, the modem tries to make a Normal, MNP or V.42 connection (Auto reliable). Hardware Flow Check is authorised (factory setting). AT\N4 The modem tries to make a V.42 (Reliable) connection AT\N5 The modem tries to make an MNP (Reliable) connection. ➮ Some types of modem will not accept an MNP connection. In such cases, use the \N0 command (Buffering) or the \N1 command (Direct mode).
%C – Authorise Data Compression By using the %C command, you can select data compression for MNP or V.42. For the compression to work, the remote modem must also have the capability for data compression and a Reliable mode (\N2, \N3 or \N4) must be active. AT%C0 Compression not authorised AT%C1 MNP 5 compression authorised AT%C2 V.
*R – Remote Configuration Once you have entered the command *R at the local modem, the remote modem can be configured via the telephone line. (Only a limited set of commands is active here). To use this facility, proceed as follows: 1. Enter ATS80=65 at the modem to be configured (the remote modem) in order to authorise remote configuration. 2. Initialise the remote modem with ATZ 3. Make the MNP connection (AT\N5) 4. Enter the Esc sequence (+++) at the local modem 5.
ENTER PASSWORD has appeared, a password which is stored in the local modem must be entered at the remote modem. ATS0=1 (so that the modem goes on-line) Provided the local modem recognizes a valid password, it will break off the connection and, after 10 seconds, it will dial the telephone number represented by the password in question. ➮ To switch off Automatic Callback, the value of Register 80 must be reset to 1 (ATS80=1, then ATZ). 2.
Chapter 3 DIALLING WITH V.25.Bis In order to change from the Hayes to V.25bis command setting and vice-versa, the value of Register 80 must be changed in each case. • ATS80=33 (Change from Hayes to V.25bis Commands) • CNLS80=1 (Change from V.25bis to Hayes Commands) ➮ Changes become active only after a modem reset (ATZ or CNLZ). To carry out a dialling operation in V.
Table 5 Commands and Modem Messages with V.25bis Command/Message Character Sequence Connection Request Call Number Identification Number CRIxx...x;yy...y xx...x (dialling character sequence) yy...y (identification number) Connection Request Call Number CRNxx...x xx...
Chapter 4 MODEM MESSAGES The modem responds to AT commands with Modem Messages. You can control their format (verbal or numeric) with the V command. In addition, the modem issues Connection Messages, when it recognizes activities on the telephone line. The X command determines which messages are authorised here. Messages regarding Error correction are controlled via the W command and with the S95 Register. The following table gives an overview of the possible messages.
(09) CONNECT 0600 (10) CONNECT 2400 (11) CONNECT 4800 (12) CONNECT 9600 (13) CONNECT 7200 (14) CONNECT 12000 (15) CONNECT 14400 (16) CONNECT 19200 (17) CONNECT 38400 (18) CONNECT 57600 Where X1, X2, X3 or X4 is active, these messages show the interface speed, or the speed on the line, once the data connection has been made (22) CONNECT 75TX/1200RX Modem has created a V.23 link in Originate mode (23) CONNECT 1200TX/75RX Modem has created a V.
S-REGISTERS Chapter 5 The modem has a series of S-Registers, in which the active configurations are stored. The contents of a number of Registers are stored in a non-volatile memory (NVRAM), which can be interrogated with Z, &Y and &W commands. The syntax for entering and requesting Register values is given in the description of the S command. The values of most of the Registers can be modified by using AT commands.
Register S38 S39* S40* S41* S46* S48* S80 S82 S86 S95* Range Default. Description 0–255 sec 20 Delay before “hanging up” Bit-mapped 3 Flow check Bit-mapped 105 (69h) General options Bit-mapped 131 (83h) General options Bit-mapped 138 Control data compression Bit-mapped 7 Control V.
S5 – Backspace Character ASCII value for Backspace. Entering this will delete the character to the left of the cursor (and the last character in the command memory) and the cursor moves one space backwards. Range: 0-32, 127; factory setting: 8 (ASCII Backspace) S6 – Waiting Time for Dialling Tone The value of the S6 Register determines when the modem will begin to dial after “lifting the handset” (or after recognizing the W parameter in Dialling command mode).
S10 – Delay between Carrier Loss and Hanging Up The period of time, during which the modem waits after carrier loss, before it “hangs up”. This allows for a temporary loss of the carrier. The value must be greater than the value of the S9 Register, so that the modem does not “hang up” before recognizing the carrier. Range: 14-100 1/10 sec; factory setting: 14 (1.
S16 – Modem Test Options Factory setting: 0 Bit 0 Local analogue test loop 0 OFF (factory setting) 1 ON (&T1) Bit 1 Reserved Bit 2 Local digital test loop 0 OFF (factory setting) 1 ON (&T3) Bit 3 Status of remote digital test loop 0 OFF 1 ON Bit 4 Status of a remote digital test loop, disengaged by the remote modem 0 OFF (factory setting) 1 ON (&T6) Bit 5 Remote digital test loop with Self-Test 0 OFF (factory setting) 1 ON (&T7) Bit 6 Local analogue test loop with Self-Test 0 OFF (factory setting) 1 ON &T8)
S19 – Autosync Register Bit 0 Bit 1 0 1 Bit 2 0 1 Bit 3 0 1 Bit 4 0 1 Bit 5-7 Reserved Synchronous protocol BSC HDLC Control of “Address Detector” Address Detector not authorised Address Detector authorised Non return to zero NRZ1 NRZ Mark idle flag or sync idle Reserved S20 – HDLC Address/BSC Synchronous Character Range: 0-255; factory setting: 0 S21 – V.
S22 – Loudspeaker/Authorised Modem Messages Factory setting Bit 0,1 0 1 2 3 Bit 2,3 0 1 2 3 Bit 4-6 0 4 5 6 7 Bit 7 : 117 (75h) (01110101b) Volume Low (L0) (factory setting) Low (L1) Medium (L2) Loud (L3) Loudspeaker Condition Always OFF (M0) OFF after carrier recognition (M1) (factory setting) Always ON (M2) ON during Handshake (M3) Authorised modem messages (X0) (X1) (X2) (X3) (X4) (factory setting) Reserved S23 – General Options Factory setting Bit 0 0 1 Bit 1-3 0 1 2 3 4 5 6 7 Bit 4,5 0 1 : 63 (3Fh)
2 3 Bit 6,7 0 1 2 Odd No parity (factory setting) Guard Tone No Guard Tone (&G0) (factory setting) No Guard Tone (&G1) Guard Tone 1800 Hz (&G2) S24 – Current Saving Switch This determines when the modem goes into a current saving switch, where it does not register activity at the interface, nor on the telephone line. Range: 1-120 sec; factory setting: 60 S25 – DTR Delay Time Period of time between the departure of DTR and “hanging up”.
2 Bit 6 0 1 Bit 7 Impulse loop (&X2) CCITT/Bell Mode (B) (only at 300 and 1200 bps) CCITT (B0) (factory setting) Bell (B1) Reserved S28 – General Options Factory setting Bit 0 0 1 Bit 1 0 1 Bit 2 0 1 Bit 3-7 : 0 V.23 Split Speed Not authorised (\W0) (factory setting) Authorised (\W1) V.23 Split Speed Direction 75 Tx (%F0) (factory setting) 1200 Tx (%F1) V.23 Semi-Duplex Not authorised (factory setting) Authorised (%F3) Reserved.
S31 – General Options Factory setting Bit 0 Bit 1 0 1 Bit 2,3 0 1 2 Bit 4-7 : 194 (C2h) (11000010b) Reserved Controlling Automatic Speed Recognition (N) Automatic Speed Recognition OFF (N0) Automatic Speed Recognition ON (N1) (factory setting) Controlling Extended Connection Messages (W) Interface speed only (W0) (factory setting) All information (W1) Only modem speed (W2) Reserved S32 – XON Character Determines the value of the XON character.
S37 – Speed on the Telephone Line Factory setting : 0 Bit 0-3 This Register is dependent on the value of the F command. If invalid values are entered, the Register returns to the factory setting. 0 Automatic speed recognition (F0) (factory setting) 1-3 300 bps (F1) 4 Reserved 5 1200 bps (F4) 6 2400 bps (F5) 7 V.
S40 – General Options Factory setting Bit 0 0 1 Bit 1 0 1 Bit 2 0 1 Bit 3-5 0-5 Bit 6,7 0 1 2 3 : 105 (69h) (01101001b) MNP 10 authorised MNP 10 not authorised (-K0) MNP 10 authorised (-K1) (factory setting) Voltage adjustment for radio telephones No adjustment possible (factory setting) Adjustment authorised M1 Speed of MNP Handshake Highest possible speed (*H0) (factory setting) Speed 1200 bps (*H1) Handling the Break Signal \K0 to \K5 (factory setting is \K5) MNP Block size 64 characters (\A0) 128 chara
S46 – Authorising a Data Compression Range: S46=136 S46=138 136 or 138; factory setting: 138 Error Correction Protocol without Data compression Error Correction Protocol with Data compression (factory setting) S48 – Directing the V.42 Handshake Range: S48=0 S48=7 S48=128 0, 7 or 126; factory setting: 7 No V.42 Handshake; attempt to make a V.42 connection The remote modem's capabilities are checked (factory setting) No V.42 Handshake, but direct Fallback.
S86 – Error Codes for NO CARRIER Messages For every NO CARRIER message a value is written into this Register, which assists in discovering the cause of the error. In each case, the initial cause of the NO CARRIER message is recorded. S86=0 Normal break of connection; no error S86=4 Loss of carrier S86=5 Remote modem has no V.
TECHNICAL INFORMATION Appendix Digital Interfaces To set up a connection between modem and computer/terminal (DTE = Data terminal equipment), an interface cable with the following features is required: ISO 2110 (SUB-D 25) to V.42 with V.28 level Interface Cables to V.
LED Indicators The LED indicators show the operating condition of the modem: Display Meaning and Function (Operating Condition) POWER Modem is is ready for operation ONLINE Modem switched to transmission line DSR Answer tone is present DCD Modem has recognized carrier tone from remote modem CTS Modem is ready to send RTS Transmit request is present DTR Computer is ready for operation GLOSSARY AAE AM BPS BSC DCE DTE DPSK DTE ETX FCS FM FSK HDLC LRC MFV MNP oK PM PSK QAM Retrain SDLC Automati
STX SYN uK Sign Length Start of Text Synchronous Character Lower Channel Data Frame, made up of Data bits Start, Stop and Parity bits CCITT RECOMMENDATIONS V.21 V.22 V.22bis V.23 V.24 V.25 V.25bis V.26 V.26bis V.26ter V.27 V.27bis V.
V.28 V.42bis Definition of the electrical characteristics of so-called non-symmetrical polar lines 9600 bps, dedicated line operation; Fallback to 7200 or 4800 bps.
