Data And General Commands; At Attention Code; Enter Key; At Escape Sequence - Multitech MultiModem SocketModem MT9234 Series At Commands Reference Manual

Data and General Commands

AT
Description:

ENTER Key

Description:
+++AT
Syntax:
Description:
A/
Syntax:
Description:
A
Syntax:
Description:
Result Codes:
B
Description:
Syntax:
Values:
Defaults:
Result Codes:
Multi-Tech Systems, Inc. AT Commands for the MultiModem & SocketModem MT9234 Series (S000434H)
Downloaded from Elcodis.com electronic components distributor
Chapter 1 – AT Commands, S-Registers, and Result Codes
Attention Code
The attention code precedes all command lines except A/, A: and escape sequences.
Press the E (R ) key to execute a command.
NTER ETURN
Escape Sequence
+++AT<CR>
Allows the modem to exit data mode and enter on-line command mode. While in on-
line command mode, AT commands are sent directly to the modem.
Use the return to on-line data mode command (O<value> – Return to On-Line Data
Mode) to return to data mode.

Repeat Last Command

A/
This command repeats the last AT command. The modem repeats the command
currently in the command buffer.
IMPORTANT:
Do not use the AT prefix with this command.
Do not conclude the command with a terminating character (E

Answer

ATA
This command instructs the modem to connect to the line and establish a connection
with the remote modem or DCE. This command can be canceled if the modem
receives a new command or character from the host system before the handshake
begins.
CONNECT if a connection is established and the extended result code parameter is
equal to 0. (See X<value> – Select Result Code and Monitor Call Progress).
CONNECT <rate> if a connection is established and the extended result code
parameter is not equal to 0.
NO CARRIER if a connection cannot be established or the modem aborts the
connection on request of the host system.
OK if the commands are aborted or DTR is turned off by the host system when the
data terminal ready control is not set to 0. See &D – DTR Control.
ERROR if the modem is in on-line command mode when receiving the A command.

Communication Standard Setting

This command selects the communication standard used by the modem.
ATB<value>
0 Selects CCITT V.22 mode when modem is at 1200 bps.
1 Select Bell 212A when modem is at 1200 bps.
2 Deselect V.23 reverse channel (same as B3).
3 Deselect V.23 reverse channel (same as B2).
15 Select V.21 when the modem is at 300 bps.
16 Select Bell 103J when the modem is at 300 bps.
0 and 15
OK if <value> = 0-3, 15, 16
ERROR if <value> ≠ 1.
).
NTER
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