1592038710 Gas Leak Detector Modbus GB 01.12.2016
GDS41M-GDS66M-GDI41M-GDI66M 20/28
Detector Address 1006:
The detector address is the value of address set by the hexadecimal switches.
Software Version 1007:
The software version is the revision of firmware operating on the processor of the
detector.
6.5 ANALOG OUTPUT HOLDING REGISTERS
The Register Map specifies the details of storage locations (registers and flags) within the
detectors.
Analog output holding registers are READABLE using function code 03, and WRITABLE using
function code 06.
REGISTER
DESCRIPTION
RANGE
DETAILS
2000
Alarm setpoint (ppm)
0-65.535
Alarm set-point.
Threshold in parts per
million.
2001
Alarm delay
0-59
The Alarm Delay is the time
in minutes after the gas
concentration exceeds the
alarm level and the Alarm
Flag Register 3000 is set to
1.
2002
Buzzer delay
0-59
The Buzzer Delay is the
time in minutes the buzzer is
deactivated for during the
alarm phase when the gas
concentration exceeds the
alarm set point.
Alarm Set Point (in ppm) Register 2000
The Alarm Set Point register 2000 stores the software setting for the alarm set point in
parts per million (ppm).
Writing the value zero into this register will enable the hardware potentiometer P1 to
determine the Alarm Set Point. If a value greater than zero and less than the full scale
sensor limit in ppm is written into register 2000 then the hardware potentiometer setting
is ignored and the value written into register 2000 determines the alarm set point.
For example, writing the value 500 into the Alarm Set Point register 2000 effectively
overrides the hardware alarm set point on the potentiometer P1 and sets the alarm gas
concentration threshold to 500 parts per million and will be displayed as 50 in register
1004 to represent 50% for a detector with a full scale range of 1000 ppm.
For details on the working process, please see the flow chart nr.3
Alarm Delay Register 2001
The Alarm Delay Register 2001 stores the software alarm delay period up to 59 minutes
and the jumpers J5 and J6 set the hardware alarm delay period.
The alarm delay is the duration between the unit detecting a gas concentration above
the alarm set point and the activation of the relay and the buzzer. If there is a jumper on
J5 or J6 or both J5 and J6 have jumpers on connecting the pins, the software value is
