Multi Tech Equipment MTA128ST User Manual
Page 29
AT Command, S-Registers, and Result Codes
29
Result Codes
When the MTA128ST/NT receives an AT command from the computer or terminal, it attempts to execute the
command, then sends a status message to the computer or terminal that reports the result of the command.
The MTA1 28ST/NT provides you with several of these response messages, or result codes, which can be
displayed on your monitor or intercepted and used by your communications software. Using the V
command, you can select whether the result codes are terse (numbers) or verbose (words).
The MTA128ST/NT’s result codes are listed below. Note that the speed of an ISDN channel is always
either 56 Kbps or 64 Kbps. Connect messages indicate the speed of the connection between the
MTA1 28ST/NT and your computer or terminal.
TERSE VERBOSE
DEFINITION
0
OK
TA executed the command without error
1
CONNECT
TA established an ISDN connection
2
RING
TA detected a ring caused by incoming call
3
NO CARRIER
TA did not detect carrier within time allotted by register
S7
4
ERROR
Error in the AT command
5
CONNECT 1200
TA connected at 1200 bps
6
NO DIALTONE
TA has a poor connection to ISDN network
7
BUSY
TA detected a busy signal
8
CONNECT 300
TA connected at 300 bps
9
CONNECT 600
TA connected at 600 bps
10
CONNECT 2400
TA connected at 2400 bps
11
CONNECT 4800
TA connected at 4800 bps
12
CONNECT 9600
TA connected at 9600 bps
14
CONNECT 19200
TA connected at 19200 bps
17
CONNECT 56000
TA connected at 56000 bps
18
CONNECT 57600
TA connected at 57600 bps
19
CONNECT 64000
TA connected at 64000 bps
28
CONNECT 38400
TA connected at 38400 bps
79
PPPC PROTOCOL
TA using Point-to-Point protocol
80
HDLC PROTOCOL
TA using raw HDLC mode
83
V.120 PROTOCOL
TA using V.120 rate adaption protocol
84
X.75 PROTOCOL
TA using X.75 rate adaption protocol
87 CLEAR
PROTOCOL
TA using CLEAR (transparent) protocol
Using AT Commands to Operate the MTA128ST/NT
You can configure and operate the MTA1 28ST/NT entirely with AT commands if you like. But remember,
you can issue AT commands only from a terminal or from a computer running a communications program in
terminal mode. This section describes how to use AT commands for basic operations, such as calling,
answering a call, and hanging up.
Modes of Operation
The MTA1 28ST/NT has three modes of operation. They are:
•
Offline Command Mode
—MTA1 28ST/NT communicates with the terminal or computer and responds to AT
commands. There is no data communications link with a remote device.
•
Data
Mode
—MTA128ST/NT enters data mode when it makes a successful data communications link
with a remote device. In data mode, the TA can send and receive data, but it does not respond to AT
commands. Instead it treats them as data and transmits them to the remote device.
•
Online Command Mode
—MTA128ST/NT responds to AT commands while maintaining a data
communications link; however, transmission of data is suspended. To enter online command mode from
data mode, type the escape sequence +++AT
mode, type ATO