IOLAN SDS/SCS/STS/MDC User’s Guide
416
Virtual Modem AT
Commands
Appendix C
C
Virtual Modem Initialization Commands
You can initialize the modem connection using any of the following commands:
Note:
Virtual Modem initialization commands are only supported on IOLAN firmware and
configurators version 3.2 or higher.
Command
Description
Options
ATQn
Quiet mode. Determines if result codes will be
sent to the connected terminal. Basic results
codes are OK, CONNECT, RING, NO
CARRIER, and ERROR.
Setting quiet mode also suppresses the “RING”
message for incoming calls.
n=0, result codes will be sent.
(default)
n=1, no result codes will be sent.
ATVn
Verbose mode. Determines if result codes are
displayed as text or numeric values.
n=0, display as numeric values.
n=1, display as text. (default)
ATEn
Echo mode. Determines whether characters sent
from the serial device will be echoed back by
the IOLAN when VModem is in “command”
mode. Any AT commands not supported will
return an “ok” if n=1.
n=0, disable echo.
n=1, enable echo. (default)
+++ATH
Hang up. This command instructs the IOLAN to
terminate the current session and go into
“command” mode.
ATA
Answer call. Instructs the VModem to accept
connection requests. VModem will give the
terminal up to 3 minutes to answer the call. If
the ATA is not received within 3 minutes, all
pending sync messages will be discarded.
ATI0
Return the modem manufacturer name.
ATI3
Return the modem model name.
ATS0
Sets the value of the S0 register. The S0 register
controls the “auto answer” behavior.
In “manual” mode, the IOLAN will not accept
incoming sessions until an ATA is issued by the
serial device. In “auto answer” mode, the
IOLAN will automatically accept an incoming
connection request.
Register=0, sets “manual answer”
mode
Register=1-255, “auto answer”
mode (default)
