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© 2020 All rights reserved. Data subject to change without notice.
cGas Detector Digital Transmitter - Installation Manual
Rev. A | 2020.03
9 TROUBLE SHOOTING
cGas Detector won’t power up. (blank display)
Is the power properly connected? Check the wiring connections. Refer to
Section 6.7 Wiring Connection
.
cGas Detector display shows “COMM” message.
Modbus
®
or BACnet output signal has not been connected properly. Check the
wiring connections and the network settings.
Device cannot be seen by the Controller and/or the BAS / DDC on the
Modbus® network.
• Check the Baud rate. All devices in the network must have the same Baud
rate.
• Check that local area network wiring is correct, especially the A and B
lines to make sure they are not swapped between devices on the network.
• Check the Modbus® ID. Each device must have a unique ID assigned to
it.
Device cannot be seen by the Controller and/or the BAS / DDC on the
BACnet® network.
• Check the Baud rate. All devices in the network must have the same Baud
rate.
• Check to make sure the device has a unique ID assigned to it, which is
made up of the MAC ID and the Base ID.
• Check that local area network wiring is correct, especially the A and B
lines to make sure they are not swapped between devices on the network.
Frequent, unexpected alarm reading reported to BAS/DDC.
Check to see if EMI and RF interference is causing the equipment to react this
way. Refer to Section 6.5.2 EMI and RF Interference Considerations in the cGas
Detector Digital Installation Manual for more information.
