10.2 Windows COM device support
M-Switch provides support to connect to Windows COM devices. This allows data to be
sent directly over serial based modems, or via 3rd party systems.
10.2.1 Preparation to use a COM device
It is advisable to have configured a working ACP127 based M-Switch configuration before
going any further, using a TCP-based circuit connection. This allows verification of routing,
and authentication before configuring the COM device.
The ACP127 channel process will relay information through a serial proxy. It may be
useful to enable logging for the serial proxy during configuration. To do this, set the
environment variable SERIALPROXY_DEBUG to a debug output file of your choice.
10.2.2 Configuring a COM device
Once the COM device drivers have been installed, the device settings should be set. For
example
• Set baud rate to 300bps
• Set data bits to 7
• Set Parity to Odd
• Set Stop bits to 1
• Set Flow Control to Hardware
Note: In this example a data rate of 300bps is being set for the COM device.
M-Switch will be told to transfer data at a higher rate to prevent buffer underflows.
ACP127
46M-Switch Operator's Guide
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