Detcon 1000 - Manual (Page 23)

Mdl 1000 H2S E-Chem / Inst. Air
Model 1000 H2S E-Chem w Instrument Air Rev. 1.1 Page 19 of 28
Code 03 - Read Holding Registers is the only code supported by the transmitter. Each transmitter contains 6
holding registers which reflect its current status.
Register #
High Byte Low Byte
40000 Gas type Sensor Life
Gas type is one of the following:
01=CO, 02= H
2
S, 03=SO
2
, 04=H
2
, 05=HCN, 06=CL
2
, 07=NO
2
, 08=NO, 09=HCL, 10=NH
3
, 11=LEL, 12=O
2
Sensor life is an estimated remaining use of the sensor head, between 0% and 100%
Example: 85=85% sensor life
Register #
High Byte Low Byte
40001 Detectable Range
i.e. 100 for 0-100 ppm, 50 for 0-50% LEL, etc
Register #
High Byte Low Byte
40002 Current Gas Reading
The current gas reading is stored 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 Set point
This is the trip point for the first alarm.
Register #
High Byte Low Byte
40004 Alarm 2 Set point
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 ascending 0-Alarm 2 is descending
Bit 1 1-Alarm 2 is normally energized 0-Alarm 2 is normally de-energized
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 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 energized 0-Alarm 1 Relay is not energized
Bit 2 1-Fault is normally energized 0-Fault is normally de-energized