Motorola ME-560M User manual

USER’S MANUAL
For
Motorola 56K/V90 External
Data/Fax/Voice Modem

Table of Contents
INTRODUCTION
Package Contents
System Requirement
1 - Installation
2 - COMMAND REFERENCE
2.1 General Command Information
2.2 AT Commands
2.2.a Commands Preceded by &
2.2.b Commands Preceded by \
2.2.c Commands Preceded by %
2.2.d Commands Preceded by +
2.2.e Commands Preceded by **
2.3 Dial Modifiers
2.4 Commands Not Preceded By AT
2.5 Result Codes
3 - S REGISTER REFERENCE
3.1 Register Summary
3.2 Glossary of the S Registers
4 - TESTING
4.1 Local Analog Loopback
4.2 Local Analog Loopback with Self-Test
5 - TROUBLESHOOTING GUIDE
6 - APPLICATION EXAMPLES
6.1 Dialing a Remote Modem
6.2 Dial a Stored Number
6.3 Manual Answer an Incoming Call
6.4 Auto Answer an Incoming Call
6.5 Voice to Data Switching
APPENDIX
A - CALLER ID COMMANDS

B - TECHNICAL SPECIFICATIONS
D - QUICK REFERENCE
E - GLOSSARY
F - ASCII CODE TABLE
G - Approximately Power Consumption

INTRODUCTION
Instructions for installing your Data/Fax/Voice Modem will be found in the Installation
Manual, while the information in this manual, deals exclusively with the operation of the
modem after it is installed, such as the command set, the internal configuration registers,
troubleshooting and testing.
Features
This Data/Fax/Voice Modems combine the features of a 56000 (Receive only)
/33600/28800/14400/9600 BPS for data modem and a 14400/9600 BPS for FAX modem.
Your new Data Modem gives your personal computer the ability to send and receive FAX
messages over the telephone line like a standard FAX machine. Your Data Modem also
allows your PC to communicate with other personal computers, terminals or BBS's
(Bulletin Board Systems) through the data modem functions.
When used as a data modem, your Modem uses the standard AT command set and is fully
compatible with the specification shown in the following table,
Modem Type Modulation/Function Control Code AT Command Set
Data Modem K56Flex Compatible
ITU-T V.90 Compatible
ITU-T V.34 1996 –33.6 Kbps to 2.4 Kbps
ITU-T V.32bis –14.4 Kbps to 4.8 Kbps
ITU-T V.32 –9.6 Kbps to 4.8 Kbps
ITU-T V.22bis –2.4 Kbps
ITU-T V.23 –1.2 Kbps/75 bps
ITU-T V22 –1.2 Kbps
ITU-T V.21 –300 bps
Bell 212A –1.2 Kbps
Bell 103 –300 bps
Automatic Mode Selection
Automatic Rate Adaption
Digital Near –End/Far –End Echo
Cancellation
ITU-T V.8 Signaling
ITU-T V.8bis Signaling
ITU-T V.54 Loopback Test support
ITU-T V.42/MNP™2-4 Error Correction
ITU-T V.42/MNP5 Data Compression
Auto-baud DTE Rate 230.4 Kbps Maximum
Hayes AT Commands
Fax Modem ITU-T V.17 –14.4 Kbps to 9.6 Kbps
ITU-T V.29 –9.6 Kbps to 4.8 Kbps
ITU-T V.27ter –4.8 Kbps and 2.4 Kbps
ITU-T V.21 Channel 2 –300 bps
TIA/EIA 578 Class 1 AT + Commands per
TIA/EIA 578 Class 1
Voice Modem Full-Duplex Speakerphone with Automatic
Gain Control and Room Monitor
Answering Machine
Full-Duplex Speakerphone Controller
Telephone Answering Machine Controller AT # Voice Support
Switching between DATA mode, FAX mode and Voice mode operation of your
Data/Fax/Voice Modem is done through its firmware, no hardware settings are required.
If you are already familiar with the use of a modem and the Hayes AT command set,
this modem will be extremely easy for you to use. Just read the installation procedures in
the installation manual and you are ready to begin operation.
If you are new to modem communications, we recommend that you read through this
manual first. If you come across terms that you don't understand, consult the glossary.

Words in boldface type are command names, commands, or default settings. Carriage
returns (Enter) are noted with <CR> or [ENTER]; this does not mean to enter these
characters literally; but instead to press the Enter key.
The communication software which should be used depends on the kind of machine that
you are going to communicate with. If you are going to call a FAX machine then you must
use the Fax software. If the machine that you are going to communicate with is a modem
then you must use a data modem communications software.
Note: This manual is written to be used for several models of Fax/Data Modems.
All the description in this manual about Caller ID, V.90 and Fax class 1 apply only
to the models which support these function.
Package Contents
The following material would be the bundle of this modem.
•Power Adapter
•Serial RS-232 Cable DB25/DB9
•Phone Cable , Type RJ11
•A CD-ROM with the INF Driver inside and a communication application
System Requirement
A host computer system should with a high speed RS-232 serial port capability of
supporting 115200 BPS is a highly recommendation. Fully data/fax/voice functionality is
only supported on system using a Intel 368 processor or higher or equivalent.
LED Indicator Specification
There are several LED light show in front of modem while the modem be powered on. And each light
would indicate the difference specification or meaning as following.
LED
Indicator Description
PWR POWER -- Light when the modem has power applied.
AA Auto Answer –When the light is on, the modem is autoanswering the incoming
call
TR Data Terminal Ready –Lights when the host computer is ready to send or
receive data. Indicates the status of the DTR signal from computer.
OH Off Hook –Lights when the modem is using the telephone line.
CD Data Carrier Detect –Lights when the modem success in on line and signal to
computer.
SD Transmit Data –Flashs when the modem are sent from the serial port of
computer to modem. At high data speeds this LED may appear always be ON.
RD
MR
Receive Data –Flashs when data is sent from modem via serial port to
computer.
At high data speeds may appear to always ON.

Modem Ready –When the light is on,the modem’s power on
1 - Installation
This chapter describes how to install your Data/fax/Voice modem in your computer and
connect it to a telephone and telephone line.
Installation overview
The installation process for Windows 95/98 consists of the following steps. And please
refer to the figure 1.1.
Connect the AC power adapter
1. Plug the power cable into the connector labeled AC on the modem.
2. Plug the other side of cable into the wall outlet.
Connect the modem into the computer’s RS-232 serial port
3. Plug the male of the interface cable into the female connector (labeled Serial Port)
on the modem’s back panel. Then you might tighten the screws.
4. Plug the other side of the cable into the serial port (ie. RS-232) on the back of the
computer, the terminal, or other devices. Then you might tighten the screws.
Connecting to the telephone line
To connect your modem to the telephone line:
1. Unplug your telephone from the wall jack by pressing the protruding tab toward the
plastic connector and removing the connector from the wall jack.
2. Take the telephone cord that was included in your modem package and plug either
end into LINE JACK on the modem .
3. And plug another end of the telephone cord into the LINE jack on your wall, just as
you plug telephone set into the wall as usual.
Connecting the telephone set
By connecting a telephone to your modem, you can use the telephone to make voice calls
when your modem is turned off or not being used. To connect a telephone set to your
modem.
Take the cord attached to your telephone and plug it into the fax/modem jack labeled

PHONE. And then lift the telephone handset and listen for a dial tone. If you can hear the
dial tone as usually. Mean that the telephone line path setup should be no problem.
Connection your External MIC- PHONE and SPEAKER to Modem
For voice application adapter Micro-phone to MIC and with one external SPEAKER
jack for external Speaker extension.
Quick Install Modem Driver on Your PC
We support you two difference way for you for installing your modem on PC. We suggest
you to use PNP(Plug and Play) start-up. That would be more easy to you. First of all.
TURN ON the POWER SWITCH in the rear of modem. The PWR LED will lights up.
Start-up Modem with PNP:
A). Power up or reboot your PC.
Waiting for Windows 95/98 boot-up and Windows95/98 would find your new modem
by automatically. Then it will stop while the modem was found and a dialog box
appears with the title New Hardware Found as shown below Figure 1.1. Click on OK.
B). Then the screen show as below appears, Figure 1.3, and asking you to insert the
media with the drivers for your new hardware. Now insert the software disk with

label INF DRIVER or CD-ROM included with you modem, and tell you PC where to get
the DRIVER for the new modem. Then
Click on [Other Locations] to point on your floppy.
C). Pointing to the disk which we inserted..
Then pick a file named “3450RDK.INF”.
Select “Motorola MC143450RDK”for the model of modem.
Now click the [Next ]. Then the Windows 95/98 will copy some related date into the
system by automatic. And next screen changes to the one shown in following figure
1.4. Click on [Next].
D). After the modem is installed in your computer system, reboot the computer
system and waiting for it started.

OK! Let’s check up you modem. Skip the next paragraph to the Testing your
modem
If you got a failed installation in last Plug-N-Play automatically process. You may try
the following process for manual installation. If you still could not accomplish the modem
installation. Please contact to your dealer for the service.
With Manual Installation :
A). Get into the SETUP in the Start button
[CONTROL PANEL] à [SYSTM] à [DEVICE MANGER]
à [FLASH]
, and waiting for new modem detection. We recommend you to use the auto-detection
for COM port assigning. Or you must make sure that which COM port you use.
B). When the auto-detection is stop and the modem is found. Windows 95/98 would show
a standard modem was found cause of she could not recognize the name of
manufacture. So we must [Change] the name for modem.
Click on the [CHANGE…] button.
C). Point to the disk which we have prepared.
Then pick a file named “3450RDK.INF”.
Select “Motorola MC143450RDK”for the model of modem. Now click
the [Next ]. Then Windows 95/98 will copy some related date into the system by
automatic.
D). After the modem is installed in your computer system, reboot the computer
system and waiting for it started.
Testing your modem with Windows 95
Before you using any communication application to reach the modem, use the following
procedure to verify your new installed modem’s operation.
Turn on your computer and modem, use the following step to verify your new installed
modem.
1. Return to CONTROL PANL and double click on your Modems icon. You should see
your modem listed as shown in following figure 1.5.

2. To verify the modem is working, click on the tab for Diagnostics
3. Select the COM port icon that is assigned to your modem. (Remember this COM
port)
4. Select the More Info button. Windows 95 informs you that this will takes a moments
as it communicates with modem. The More Info dialog windows appears showing
your port information and the ATI commands, which verify modem installation, as
shown in Figure 1.6 blow.
5. Choose OK to leave this window. (Command response is currently preliminary and is
always subject to change per upgrade. An ERROR message or other information is
acceptable for some of I commands. ) Be sure to write down the COM port number,
so you can enter it in your selected applications software later.
This process verifies that your modem is now operational in Windows 95/98. Go to the
communications software package bundled with your modem, or your selected software,
and follow the guidelines for marking connections.

Communicating with your modem
After you complete the fax/modem installation, you can install your communication
software and use it to communicate with you fax/modem.
There are two ways you can communicate with you modem, indirectly using the features
provided in your communication software or directly using AT commands.
The indirect communication methods allows you to use the commands in your
communications software to perform operations such as dialing or answering a call, file
transfers, and terminal emulation. With this method, communications software acts as a
buffer between you and your modem, dictating the amount of direct interaction you will
have with your fax/modem. For example, your communications software may have menus
and commands that let you dial and answer calls.
If your communication software includes fax capabilities, you can also use it to send faxes
to and receive them from fax machines and fax/modem. The manual that came with your
communications software should describe how to perform these data and fax activities.
The direct communication method, on the other hand, lets you access your fax/modem
directly by sending AT commands from you keyboard and viewing the fax/modem result
codes sent to your computer screen. To use this method, use your communication
software to place your computer into local terminal or direct-connect mode (the manual
that came with you communications software should explain how to do this). The rest of

this User’s Guide contains information you can use to communicate directly with your
fax/modem:
Note: Your communication software must use the same number of start bits, data bits,
parity bit, and stop bit(s) as the remote modem or fax/modem, regardless of whether you
are using your software or AT commands to perform your tasks. Otherwise, you will not
be able to exchange data.
You may want to talk with the person at the remote device to make sure that the remote
modem or modem is using the same number of start bits, data bits, parity bit, and stop
bit(s) as your modem. The manual that came with you communication software should
describe how to change these settings. Facsimile machines are amore forgiving than
modems or fax/modems, and do not require you to specify this information.

2 - COMMAND REFERENCE
This chapter provides an alphabetized reference with examples for all commands for the
modem. The system of commands is depicted in Figure 2-1.
To use these commands for dialing or configuring the modem, make sure the communi-
cations software package you will be using lets you operate the modem through its
internal commands. If your software permits use of the modem's internal commands, read
this chapter. If not, read your software user's manual and ignore the rest of this manual.
2-1 General Command Information
Except for the A/ command and the +++ escape command described in Section 2.4, all
commands must be prefixed with the attention code AT. For instance, the Acommand
(below) would be entered as: "AT A<CR>". Without the AT prefix, the command line
cannot be executed. Once entered, AT cannot be deleted with the Backspace or Delete
key.
More than one command can be placed on a single line and, if desired, separated with
spaces for readability. Once the carriage return (Enter) key is pressed, the command line
is executed. A line with no carriage return is ignored.
The modem accepts either upper or lower case characters in the command line and ignores
any spaces within or between commands. Typing errors can be corrected with the
Backspace key. Exceptions are noted in the description of specific commands.
Variables (r and x) are listed in italics. Punctuation symbols (, ; ! @) use as dial modifiers
are listed alphabetically according to their English names at the beginning of Section 2.3.
Where two commands are separated by a slash, either command will have the same effect.
For example, if the command is listed as B0/B, issuing either B0 or B will have the same
effect.

2-2 AT Commands Description
AT Means “Attention”
Each modem’s command should start with “AT”character.
ATA Go On-line in Answer Mode
This command instructs the modem to go off-hook immediately and then make a
handshake with the remote modem. Handshaking is not available during leased
line operation.
Ais usually used to manually answer an incoming call or to switch from voice
conversation to data communication.
For others modem command, please refer to the following table from 2.1 ~ 2.26 for detail.
Each command would has denoted with an “*”which for means default setting.
Table 2.1Basic AT Commands
Basic AT Commands Description
A/ - Re-execute Command A/ - Re-execute Command
AT=x - Write to Selected S-register AT=x - Write to Selected S-register
AT? - Read Selected S-register AT? - Read Selected S-register
A - Answer A - Answer
Bn - CCITT or Bell 0= Responds with OK but does nothing.
1= Responds with OK but does nothing.
Cn - Carrier Control 1= Responds with OK but does nothing.
Dn - Dial
dial modifiers 0 1 2 3 4 5 6 7 8 9 A B C D * # (Dial digits)
L (redial last number) - Responds with Error if ATDL is issued
but if L is embedded in the dial string, it is considered as a
presentation character and hence ignored.
P (Pulse)
T (Tone)
R (Reverse to answer mode)
S=n (where n = 0 - 3)
! (Flash)
W (Wait for dial tone)
@ (Wait for silence)
, (Pause)
; (Return to command state)
^ (toggles calling tone enable/disable) - ^ is considered as a
presentation character.
H (for hangup)
- (at end of phone number for linking)
En - Command Echo 0=disable
1=enable*
Fn - Select Line Modulation 0 to 10=Responds with OK but does nothing.
Hn - Disconnect 0=onhook
1=offhook
In - Identification 0=product code showing 56000 **
1=rom checksum
2=calc rom checksum

3=firmware version **
4=oem identifier (LEO 56K External) **
5=country code
6=responds with Error
7=responds with Error
where ** denotes customizable parameter.
Ln - Speaker Volume 0=low
1=low*
2=medium
3=high
Mn - Speaker Control 0=speaker always off
1=speaker on during call establishment, but off when receiving
carrier*.
2=speaker always on.
3=Responds with OK but does nothing.
Nn - Automode Enable 0=disable, forcing +MS=56,0,60000,60000,0,0
1=enable, forcing +MS=56,1,300,60000,0,0
0n - Return to Online Data Mode 0=return to online without retrain
1=return to online with retrain
P - Set Pulse Dial
Qn - Quiet Results Codes 0=enable result code returned*
1=disable result code returned
2=returned only in originate mode
Sn - Read/write S-Register
n
n=v
n?
From 0 to 95
T -Set Tone Dial default tone dial*
Vn - Result Code Form 0=short form
1=long form*
Wn - Connect Message Control 0=upon connection, modem reports only the DTE speed*.
1=upon connection, modem reports error correction protocol and
DTE speed.
2=upon connection, modem reports DCE speed.
Note that the connect message response is a function of Wn, Xn
and \Vn. See Table 3.24 for detail.
Xn - Extended Result Codes 0=blind dial, no busy detect, CONNECT.
1=blind dial, no busy detect, CONNECT XXXX.
2=dial tone detect, no busy detect, CONNECT XXXX.
3=blind dial, busy detect, CONNECT XXXX.
4=full monitor, all messages*, CONNECT XXXX.
Where XXXX = DTE rate or DCE rate.
Note that the connect message response is a function of Wn, Xn
and \Vn. See Table 3.24 for detail.
Yn - Long Space Disconnect 0=Responds with OK but does nothing.
1=Responds with OK but does nothing.
Zn - Soft Reset and Restore Profile 0=soft reset & restore profile 0
1=soft reset & restore profile 1

Table 2.2AT& commands
AT& Commands Description
&Cn - DCD option 0=dcd always on
1=dcd normal*
2=dcd on in data and command mode
&Dn - DTR option Under &M0 (=&Q0):
0=DTR always on
1=escape
2=disconnect*
3=soft reset
4=tail, 108.1 ignore DTR
5=108.1 DTR dial
6=DTR dial 108.2
&Fn - Restore Factory Configuration 0=restore factory Configuration 0
1=restore factory Configuration 1
&Gn - Select Guard Tone 0=disable*
1=550 Hz
2=1800 Hz
&Jn - Telephone Jack Control 0= responds with OK but does nothing
1= responds with OK but does nothing
&Kn - Flow Control 0=disable
3=enable RTS/CTS flow control*
4=enable xon/xoff flow control
5=enable transparent xon/xoff flow control
6=responds with Error
&Ln - Leased Line Operation 0=responds with OK but does nothing
1=responds with OK but does nothing
&Mn - Async/Sync Mode Selection 0=async*
Else responds with Error.
&Pn - Select Pulse Dial Make/Break ratio 0 to 9=Responds with OK but does nothing
&Qn - Sync/Async Mode
(This is an extension of the &Mn command) 0=Responds with OK. Else responds with Error.
Table 2.2 AT& commands
AT& Commands Description
&Rn - RTS/CTS Option Under Async:
0=CTS normal*
1=CTS always on
&Sn - DSR Override 0=DSR always on*
1=DSR normal (on in data mode)
&Tn - Test and Diagnostics 0=end test
1=local analog loopback
3=response with Error
4= response with Error
5=disallow Remote Digital Loopback request from Remote
modem*
6= response with Error
7= response with Error
8=local analog loopback with pattern.
&Vn - Display Current Configuration & Stored Profiles;
Display Last Connection Statistics 0=display current Configuration and stored profiles. 1=display last connection statistics.
2=displays stored phone numbers.
3=display forbidden numbers (up to 10 numbers)
4=display delayed call numbers (up to 10 numbers)

See Tables 3.20 and 3.22 for detail.
&Wn - Store Current Configuration 0=store current Configuration as profile 0
1=store current Configuration as profile 1
&Xn - Select Sync Clock Source 0=internal timing*
1=responds with Error.
2=responds with Error.
&Yn - Designate a Default Reset Profile 0=use profile 0
1=use profile 1
&Zn=x - Store Telephone Number n=0 to 3
x=up to 32 digits
Table 2.3AT% and AT”? commands
AT% Commands Description
%En - Enable/Disable Line Quality Monitor and Auto-
retrain or Fallback/Fall Forward 0=disable line quality monitor and auto-retrain. 1=enable line quality monitor and auto-retrain.
2=enable line quality monitor and fallback/fall forward*.
%L - Line Signal Level Responds with OK but does nothing.
%Q - Line Signal Quality Responds with OK but does nothing.
%7<8 hex numbers><same 8 hex numbers> - Set Plug
and Play Serial Number
%8<3 ascii chars><4 hex numbers><same 3 ascii
chars><same 4 hex numbers> - Set Plug and Play Vendor
ID and Product Number
“?Display stored PnP serial number
e.g. 00000000 (as factory default)
Table 2.4AT\ commands
AT\ Commands Description
\Gn DCE-DCE XON/XOFF flow control 0=disable*
1=enable
\Kn - Break Control
(controls the response of the modem to a break received
from the DTE or the remote modem or the \B command)
0=1=clear data buffers and send break to remote modem.
2=3=send break to remote modem immediately.
4=5*=send break to remote modem in sequence with transmitted
data.
\Nn - Operating Mode 0=normal mode
1=responds with Error.
2=reliable mode
3=auto reliable mode*
4=LAPM only (i.e. disconnects if LAPM cannot be established)
5=MNP only (i.e. disconnects if MNP cannot be established)
\Vn - Single Line Connect Message 0=connect messages are controlled* by command X and W
1=connect messages are displayed in single line format

Table 2.5AT+MS commands
AT+MS Commands Description
+MS=<mod>,<automode>,<min_rate>,<max_rate>,<x_la
w>,<rb_signaling> - Select Modulation <mod> 0=V.21
1=V.22bis
2=V.22bis
3=V.23
9=V.32bis
10=V.32bis
11=V.34
56=K56flex*
64=B103
69=B212
<automode>
0=disable
1=enable*
<min_rate>
300=300 bps*
1200=1200 bps
2400=2400 bps
4800=4800 bps
7200=7200 bps
9600=9600 bps
12000=12000 bps
14400=14400 bps
16800=16800 bps
19200=19200 bps
21600=21600 bps
24000=24000 bps
26400=26400 bps
28800=28800 bps
31200=31200 bps
32000=32000 bps
33600=33600 bps
34000=34000 bps
36000=36000 bps
38000=38000 bps
40000=40000 bps
42000=42000 bps
44000=44000 bps
46000=46000 bps
48000=48000 bps
50000=50000 bps
52000=52000 bps
54000=54000 bps
56000=56000 bps
58000=58000 bps
60000=60000 bps
<max_rate>
300=300 bps
1200=1200 bps
2400=2400 bps
4800=4800 bps
7200=7200 bps

9600=9600 bps
12000=12000 bps
14400=14400 bps
16800=16800 bps
19200=19200 bps
21600=21600 bps
24000=24000 bps
26400=26400 bps
28800=28800 bps
31200=31200 bps
32000=32000 bps
33600=33600 bps
34000=34000 bps
36000=36000 bps
38000=38000 bps
40000=40000 bps
42000=42000 bps
44000=44000 bps
46000=46000 bps
48000=48000 bps
50000=50000 bps
52000=52000 bps
54000=54000 bps
56000=56000 bps
58000=58000 bps
60000=60000 bps*
<x_law>
0=u-law*
1=A-law
<rb_signaling>
0=Responds with OK but does nothing*.
1=Responds with OK but does nothing.
Table 2.5 AT+MS command
AT+MS Commands Description
+MS? Query current
e.g. +MS: 56,1,300,60000,60000,0,0
+MS=? Query range shows
+MS: (0,1,2,3,9,10,11,56,64,69),(0-1),(300-60000),(300-60000),
(0-1),(0-1)
Table 2.6AT+A8 Commands - V.8bis Requirements
AT+A8 Commands V.8bis Requirements
+A8E=<v8o>,<v8a>,<v8cf>,<cfrange>,
<v8b>,<protrange> <v8o>: 1=enable DCE-controlled V.8 origination negotiation*; other
values are not supported
<v8a>:
1=enable DCE-controlled V.8 answer negotiation*; other values
are not supported
<cfrange>:

parameter not supported - must be empty
<v8b>:
0=disable V.8bis negotiation*
1=enable DCE-controlled V.8bis negotiation
2= enable DTE-controlled V.8bis negotiation
<cfrange>:
parameter not supported - must be empty
<protrange>:
parameter not supported - must be empty
+A8E? Query current
e.g. +A8E: 1,1,,0,””,””
Table 2.6 AT+A8 Commands - V.8bis Requirements
AT+A8 Commands V.8bis Requirements
+A8E=? Query range shows
+A8E: (1),(1),(0),(0-2),( ),( )
The 0 in the <v8cf> parameter is the maximum number of octets
allowed for this parameter. The ( ) in the <cfrange> and
<protrange> parameters indicate that the parameter is not
supported.
+A8T=<signal>,<1st message>, <2nd
message>,<sig_en>,<msg_en>,<supp_delay> <signal>: (no default value) 0=none
1=Initiate MRe
2=Initiate MRd
3=Initiate CRe, low power
4=Initiate CRe, high power
5=Initiate CRd
6=Initiate ESi
7=Responding MRd, low power
8=Responding MRd, high power
9=Responding CRd
10=Responding ESr
This parameter is required. Issue ERROR if missing.
<1st message> and <2nd message>:
These parameters contain octets for the V.8bis message(s) to be
sent specified as a string of ASCII hex digits. The default value
is an empty message.
<sig_en>:
0=detect initiating signals*
1=detect responding signals
2=detect both
<msg_en>:
0=disable message detection
1=enable message detection*
<supp_delay>:
0=disable 1.5 second delay between V.8bis messages*
1=enable 1.5 second delay between V.8bis messages
+A8T? Query current
e.g. +A8T: , , ,0,1,0