0 sensor replacement, Sensor replacement – Detcon 1000_CO2 User Manual
Page 25
Model 1000 CO2
Model 1000 CO2 Instruction Manual
Rev. 2.2
Page 21 of 28
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
Bit 1
1-Fault is latching
0-Fault is non-latching
Bit 0
1-Fault Relay is energized
0-Fault Relay is not energized
The following is a typical Master Query for device # 8:
Field Name
HEX DEC RTU
Slave Address
08
8
0000 1000
Function
03
3
0000 0011
Start Address Hi
00
0
0000 0000
Start Address Lo
00
0
0000 0000
No. of Registers Hi
00
0
0000 0000
No. of Registers Lo
06
6
0000 0110
CRC
##
#
#### ####
CRC
##
#
####
####
The following is a typical Slave Response from device # 8:
Field Name
HEX DEC RTU
Slave Address
08
8
0000 1000
Function
03
3
0000 0011
Byte Count
0C
12
0000 1100
Reg40000 Data Hi
02
2
0000 0010
Reg40000 Data Lo
64
100
0110 0100
Reg40001 Data Hi
00
0
0000 0000
Reg40001 Data Lo
64
100
0110 0100
Reg40002 Data Hi
00
0
0000 0000
Reg40002 Data Lo
07
7
0000 0111
Reg40003 Data Hi
00
0
0000 0000
Reg40003 Data Lo
0A
10
0000 1010
Reg40004 Data Hi
00
0
0000 0000
Reg40004 Data Lo
14
20
0001 0100
Reg40005 Data Hi
05
5
0000 0101
Reg40005 Data Lo
50
80
0101 0000
CRC
##
#
####
####
CRC
##
#
####
####
Additional Notes:
The calibration LED will light when the transmitter is sending a response to a Master Query. Communications
are 9600 baud, 8 data bits, 1 stop bit, No parity, and half duplex 485.
11.0 Sensor Replacement
Should the optical gas sensor element (part number 370-365878-111(IR-640) or 370-287724-332 (IR-642))
require replacement, use the following procedure:
1 - (A) If the sensor is mounted in a classified area, system power to the transmitter must first be removed
before proceeding further.
(B) If the sensor is in an unclassified area, remove front enclosure cover and unplug transmitter module.