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Argent Terminal Adaptor - User Guide
Version 1.1 Telstra Corporation Limited
Page 21/29 ACN 051 775 556
4 V.24 SERIAL PORT ‘AT’ COMMANDS
4.1 Introduction
The Argent Terminal Adaptor (ATA) is an ISDN device with powerful features
for interconnection. While the primary purpose of Argent is the delivery of
transactions to centralised hosts, the ATA extends the functionality of the ISDN
line to carry this service.
‘AT’ commands refer to a set of instructions, which can be sent to the ATA to
control local features. The POTS (Plain Old Telephone System) port and V.24
(RS232) serial port can be controlled with a simple set of ‘Attention’ (AT)
commands.
4.2 ‘AT’ Commands
AT Description
A
Answers an incoming call on the B channel
&C Carrier Detect (CD) control
AT&C0 forces carrier on at all times
AT&C1 (default) follows the state of carrier on the remote host system.
Is raised after connection.
AT&C2 carrier drops temporarily after a disconnect, but remains on at all
other times.
D Dial a remote device. eg ATD6173344 5566
Allows characters {T P 0-9 * # <space> ,}
ATDT<number>, ATDP<number>, ATD<number>
&D Data Terminal Ready (DTR) Control
AT&D0 Ignore DTR from the Terminal.
AT&D1 ATA will enter command state whenever DTR goes high to low.
AT&D2 (default) Hang up any current call and prepare to accept
commands from the terminal.
E Echo
ATE0 Echo off, disables reflecting AT command character back to the
terminal.
ATE1 (default) Echo on. Any received AT command character is sent
back to the terminal.
&F Factory Default
AT&F Restore all settings back to factory default.
H Hang Up
ATH Hang up on the current data call.
I Information
ATI return the identification information of the ATA
ATI9 returns the plug and play identifier
O Go On-Line
ATO return from command state to the on-line data transfer state.
Q Quiet Mode