ABB FSCA-01 User Manual page 71

Communication protocol 71
Function
Name Description
code
08h Diagnostics Provides a series of tests for
checking the communication
between the master and the slave
devices, or for checking various
internal error conditions within the
slave.
The following subcodes are
supported:
00 Return Query Data:
The data passed in the request
data field is to be returned in the
response. The entire response
message should be identical to
the request.
01 Restart Communications
Option:
The serial line port of the slave
device must be initialized and
restarted, and all of its
communication event counters
cleared. If the port is in the Listen
Only mode, no response is
returned. If the port is not in the
Listen Only mode, a normal
response is returned before the
restart.
04 Force Listen Only Mode:
Forces the addressed slave
device to the Listen Only mode.
This isolates it from the other
devices on the network, allowing
them to continue communicating
without interruption from the
addressed remote device. No
response is returned. The only
function that will be processed
after this mode is entered is the
Restart Communications Option
function (subcode 01).