Multi Tech Equipment manual Result Codes, Using AT Commands to Operate the MTA128ST/NT

AT Command, S-Registers, and Result Codes

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

8CONNECT 300 TA connected at 300 bps

9CONNECT 600 TA connected at 600 bps

10CONNECT 2400 TA connected at 2400 bps

11CONNECT 4800 TA connected at 4800 bps

12CONNECT 9600 TA connected at 9600 bps

14 CONNECT 19200 TA connected at 19200 bps

17CONNECT 56000 TA connected at 56000 bps

18CONNECT 57600 TA connected at 57600 bps

19CONNECT 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<cr>. To return to data mode from online command mode, type ATO<cr>.

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