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Communications Serial Port S1/S2
24 900 Control Station User Guide Revision 9
May 2014
Table 7 Serial Port S1/S2: Port Diagnostic status
Status Possible Cause Controller Action What to do
GOOD N/A N/A N/A
APPLICATION
ERROR
Applies to Port S2
only. At least one
response to a host
resulted in an
exception code or
NAK.
1. Rack 1 monitor block’s
COMPORT DIAG is set to
WARNING.
2. Rack 1 monitor block’s
RACK OK pin is turned off.
3. SYSTEM MONITOR
block’s HW OK pin is
turned off.
At host, determine which message is
causing the exception code and fix it.
DATA LINK
ERROR
A large number of
messages are
resulting in data link
errors.
1. Rack 1 monitor block’s
COMPORT DIAG is set to
FAILED.
2. Rack 1 monitor block’s
RACK OK pin is turned off.
3. SYSTEM MONITOR
block’s HW OK pin is
turned off.
4. If configured as Modbus
Master port, associated
slave blocks have their
read pin values frozen to
the last value read.
1. Check baud rate.
2. Check connectors.
3. Check cable polarity.
4. Isolate cable from electrical
interference.
5. If RS232-to-RS485 converter used,
check its power, switch/jumper settings,
and polarity.
HARDWARE
FAILURE
The DUART is failing
to operate properly.
Replace the controller CPU module.
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