1592038710 Gas Leak Detector Modbus GB 01.12.2016
GDS41M-GDS66M-GDI41M-GDI66M 16/28
5. TROUBLESHOOTING
SYMPTOM
POSSIBLE CAUSE(S)
Green and Red LED off
Check power supply.
Check wiring.
GDS or GDI was possibly damaged in transit.
Check by installing another GDS or GDI to confirm the fault.
Red LED on and Green
LED off (Fault)
Sensor may be disconnected from printed circuit board.
Check to see sensor is properly inserted into board.
The sensor has been damaged or has reached the end of life
and needs to be exchanged.
Contact producer for instructions and support.
Alarm in the absence of a
leak
Try setting an alarm delay.
Perform a bump test to ensure proper operation.
6. MODBUS COMMUNICATION
6.1 COMMUNICATION SETTINGS
There are 256 selections, and the addresses are numbered 0 to 255 inclusive. Addresses are
selected by rotating the hexadecimal dial switches SW1 and SW2.
Values 1 to 247 are valid / usable addresses providing a unique identity for each gas detector.
Addresses 248 to 255 and address 0 are reserved for implementing specific features.
Modbus data with a zero in the address field is received by all detectors (irrespective of the
address selected by the dial switches) to enable the master device to broadcast simultaneously to
all the detectors.
Switch SW1 selects addresses 0 to 15 and switch SW2 multiplies the address by a factor of 16.
Technical communication data are:
Baud rate: 9,600 or 19,200 (selectable)
Start bits: 1
Data bits: 8
Parity: none
Stop bits: 1
Retry time: 500 ms (min time between retries)
End of message: silent 3.5 characters
