65
Symptom
Possible Cause
How to Verify
Corrective Action
Change UTx-M parity to
match Monitor’s EVEN
Parity.
Incorrect RS485
A/B connections
UTx-M shows Red on
Network LED
Change wiring or use menu
to flip A/B configuration.
Not connected
to MODBUS
network.
UTx-M shows fast pace
Green on Network LED
Check wiring or connect
UTx-M to MODBUS network.
Monitor’s
RS485
Information
has timeouts
or
communication
errors.
End Of Line
termination on
MODBUS
network is not
installed.
UTx-M devices flash Red on
Network LEDs from time to
time.
Ensure last UTx-M unit on
MODBUS network has EOL
switched in on position and
EOL LED in lit on that unit.
Refer to Section 4.3.2.1 on
setting EOL Switch
Multiple End Of
Line
terminations on
MODBUS
Network
segment are not
installed.
UTx-M devices flash Red on
Network LEDs from time to
time.
Ensure only end UTx-M unit
on MODBUS segment has
EOL switched in the on
position and only one EOL
LED is lit on Network
segment.
Ensure Monitor’s EOL
termination is installed if
monitor is at end of network
segment.
Refer to Section 4.3.2.1 on
setting EOL Switch
Network LED
is not flashing
slow pace
green
Refer to Section
5.1
Refer to Section 5.1
Refer to Section 5.1
No Gas
Concentration
on UTx-M
Display
Sensor Module
not connected
or broken or
loose wire to
Sensor Module
No Sensor Module LED.
Sensor LED Red.
Check wiring from UTx
Module to Sensor Module.
Only one Gas
Concentration
Bar on UTx-M
Display
Second Sensor
Module not
connected or
broken or loose
wire to second
Sensor Module
No Sensor Module LED.
Second Sensor LED Red.
Check wiring from first
Sensor Module to second
Sensor Module.
Not a dual
Sensor Module.
Sensor LED Red.
Check if Sensor Module has
dual sensors or correct type.
Sensor LED or
Sensor Module
Refer to Section
5.1
Refer to Section 5.1
Check wiring from UTx
Module to Sensor Module.