MGS-250 Manual
54 6490-9000
Revision
4
Table 18: Fault Codes
Description
Fault Code
Hex
Code
Possible Causes
Gas Detector
Temperature
Fault
0x0001
Gas Detector temperature
reports > 55° C or < -35° C.
Gas Detector
Temperature
Rate of
Change Fault
0x0002
Temperature rate of change
exceeds ~1°C/min for more
than 15 minutes.
RS485 RX
Fault
0x0004
Message too long for
receive buffer.
RS485 CRC
Fault
0x0008
Transmission is corrupted
(computed CRC doesn’t
match transmitted CRC).
Open Loop
Fault
0x0010 Possible
wiring,
connection,
and/or termination issue
exists. When analog output
type is 4-20ma and loop is
open, use 18-24AWG
shielded twisted pair with
120 ohm characteristic
impedance for Modbus
connections.
Modbus Fault
0x0020
Modbus message was
truncated or timed out early.
PPM Over-
range Fault
0x0040
PPM exceeds 9999. This
may indicate a very large
gross leak. If no leak is
present, it indicates a gas
detector error.
Input Voltage
Fault
0x0080
Input supply power to the
MGS-250 is out of range
(i.e., 24V
r
20%).
IMPORTANT:
If this fault is
active, the gas detector is
offline and not monitoring.
Correct the input supply
voltage to restore normal
operation.
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