Knowledge Base

This is a Communication Control Block (CCB) parameter. It occupies byte 0 in the CCB.

When the CCB is activated with a ComSetCCB, the specified protocol is activated and takes charge.

Protocol assignments are:

0SPLatLink
1ModBus RTU slave
2ModBus RTU master
3User programmable

Note that a protocol other than SPLatLink cannot be invoked (switched to) in the first 10 seconds after a reset.