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Model MRC88m / MRAUDIO8x8m Page: 87
© 2009 Xantech Corporation
The parsing of incoming data on the COM PORT can be disabled via a setting in the Dragon project. This
might be necessary if the COM port is to be used to control an external device and any incoming data from that
device is to be ignored. This setting can be found with the settings for configuring the COM port.
For the MRC88m system to recognize incoming ASCII command strings, the string must begin with an ‘!’ and
for data queries the string must begin with a ‘?’. All strings must end with a ‘+’. This way it can determine the
beginning and end of the string for processing.
When a proper command is sent, an ASCII acknowledgement string of OK is returned to the issuing device. If
an unrecognizable string is received, an ASCII string of ERROR is returned to the issuing device.
Example #1: (Issuing a Command String);
To turn Zone 7 ON:
Send ASCII string: !7PR1+
MRC88m Controller Reply: OK
Example #2: (Query Request)
To see what Source is currently selected in Zone 5:
Send ASCII string: ?5SS+
MRC88m Controller Reply: ?5SS3+ indicating Source #3 is currently selected in Zone 5