Table 7 Serial Port S1/S2: Port Diagnostic Status - Honeywell 900 User Manual

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Communications
Status
GOOD
APPLICATION
ERROR
DATA LINK
ERROR
HARDWARE
FAILURE
24

Table 7 Serial Port S1/S2: Port Diagnostic status

Possible Cause Controller Action
N/A N/A
Applies to Port S2 1. Rack 1 monitor block's
only. At least one COMPORT DIAG is set to
response to a host WARNING.
resulted in an
2. Rack 1 monitor block's
exception code or
RACK OK pin is turned off.
NAK.
3. SYSTEM MONITOR
block's HW OK pin is
turned off.
A large number of 1. Rack 1 monitor block's
messages are COMPORT DIAG is set to
resulting in data link FAILED.
errors.
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.
The DUART is failing
to operate properly.
900 Control Station User Guide
Serial Port S1/S2
What to do
N/A
At host, determine which message is
causing the exception code and fix it.
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.
Replace the controller CPU module.
Revision 9
May 2014