1592038710 Gas Leak Detector Modbus GB 01.12.2016
GDS41M-GDS66M-GDI41M-GDI66M 18/28
6.3 BAUD RATE
GDS and GDI sensors use 9600 as default Baud rate.
It’s possible to change the Baud rate value, to apply this change select the address and reset the
gas detector by temporarily shorting jumper J4 (or by cycling the power off and on).
After the Baud rate is set, the desired Modbus address (1-247) can be selected by changing the
switch settings with a power-cycle or reset operation afterward.
6.4 ANALOG INPUT REGISTERS
The Register Map specifies the details of storage locations (registers and flags) within the
detectors.
Analog input registers are READ ONLY using function code 04.
REGISTER
DESCRIPTION
RANGE
UNIT
1000
Concentration gas level (% of full scale).
0-100
%
1001
Concentration gas level in ppm.
0-65.535
ppm
1003
Full scale sensor level in ppm.
0-65.535
ppm
1004
Alarm set-point (% of Full Scale).
0-100
%
1005
Sensor timer.
0-65.535
hours
1006
Detector address.
1-247
n/a
1007
Software version.
100
n/a
Concentration Registers 1000 and 1001:
The real-time gas concentration is available in different formats. Register 1000 keeps
track of the percentage concentration. Register 1001 maintains the detected
concentration in parts per million.
Full Scale Sensor Level (in ppm) Register 1003
:
The full-scale sensor level is the maximum detectable gas concentration for the detector.
This maximum rating is stored in register 1003, so for example, 1003 holds the value
1000 to represent 1000 parts per million (ppm).