User manual

If either the SOH, DLE or ETB characters are included in the data,
these characters will be preceded by the DLE character. For example if
the data contains the SOH character the TNC will send the sequence
<DLE><SOH> as the replacement. This approach allows the <SOH>,
<DLE> and <ETB> characters to be included in the data stream.
5.2 Echoed Data
By default, the TNC will echo ALL transmitted data back to the con-
trolling program. The 0x2F channel byte will be used for this data. This
allows the programmer to display data as it is sent from the controller to
the receiving station. The same data passing rules apply as those that
are found in the Receive Data section.
5.3 Command Responses
The TNC will respond to all valid commands with one of two different
responses.
If the controlling program sends a command with parameters, the TNC
will respond in the following way.
Command Status Table
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<SOH> Command Variable Length Data <ETB>
Channel (may include pass
<0x01> <0x2F> characters) <0x17>
<SOH> Command CMD OpCode Command <ETB>
Channel (2Bytes) Status
(1 Byte)
<0x01> <0x4F> See Table <0x17>
Command Description Notes
Status
0x00 Command Acknowledged - OK
0x01 Bad Parameter
0x02 Too Many Parameters
0x03 Not Enough Parameters
0x04 Parameters Too Long
0x05 Parameter Value out of Range
0x06 Need Callsign
0x07 Unknown Command