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IOLAN SDS/SCS/STS/MDC User’s Guide, Version 4.0

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Appendix C

Virtual Modem initialization commands are only supported on IOLAN firmware and 
configurators version 3.2 or higher.

You can initialize the modem connection using any of the following commands:

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, no result codes will be sent.

n=1, result codes will be sent. 
(default)

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)

Echo mode. Determines whether characters sent 
from the serial device will be echoed back by 
the IOLAN when VModem is in “command” 
mode.

n=0, disable echo.

n=1, enable echo. (default)

Hang up. This command instructs the IOLAN to 
terminate the current session and go into 
“command” mode.

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.

Return the modem manufacturer name. 

Return the modem model name.

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)