DM-634C Oxygen Sensor Assembly
DM-634C O2 Sensor Instruction Manual Rev. .066
Page 19 of 25
Register#
High Byte
Low Byte
40000
Sensor Life
Gas type is one of the following:
01=CO, 02=H2S, 03=SO2, 04=H2, 05=HCN, 06=CL2, 07=NO2, 08=NO, 09=HCL, 10=NH3, 11=LEL, 12=O2
Register#
High Byte
Low Byte
40001
Detectable Range
i.e. 100 for 0-100ppm, 50 for 0-50% LEL etc.
Register#
High Byte
Low Byte
40002
Current Gas Reading
The current gas reading as a whole number. If the reading is displayed as 23.5 on the display, this register
would contain the number 235.
Register#
High Byte
Low Byte
40003
Alarm 1 Setpoint
This is the trip point for the first alarm.
Register#
High Byte
Low Byte
40004
Alarm 2 Setpoint
This is the trip point for the second alarm
Register#
High Byte
Low Byte
40005
Status Bits
Status Bits
High Byte
Bit 7
Not used, always 0
Bit 6
Not used, always 0
Bit 5
Not used, always 0
Bit 4
Not used, always 0
Bit 3
1 Unit is in calibration
0-Normal operation
Bit 2
1-Alarm 2 is in ascending
0-Alarm 2 is descending
Bit 1
1-Alarm 2 is normally energized
0-Alarm 2 is normally de-energizing
Bit 0
1-Alarm 2 is latching
0-Alarm 2 is non-latching
Low Byte
Bit 7
1-Alarm 2 Relay is energized
0-Alarm 2 Relay is not energized
Bit 6
1-Alarm 1 is in ascending
0-Alarm 1 is descending
Bit 5
1-Alarm 1 is normally energized
0-Alarm 1 is normally de-energized
Bit 4
1-Alarm 1 is latching
0-Alarm 1 is non-latching
Bit 3
1-Alarm 1 Relay is energizing
0-Alarm 1 Relay is not energized
Bit 2
1-Fault is normally energized
0-Fault is normally de-energized
Bit 1
1-Fault is latching
0-Fault is non-latching
Bit 0
1-Fault Relay is energized
0-Fault Relay is not energized
