12 d – Detcon IR-622 User Manual
Page 20
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, half duplex 485.
3.12 D
ISPLAY
C
ONTRAST
A
DJUST
Model IR-622 MicroSafe™ sensors feature a 16 character backlit liquid crystal display. Like most LCDs, character
contrast can be affected by viewing angle and temperature. Temperature compensation circuitry included in the
MicroSafe™ design will compensate for this characteristic, however temperature extremes may still cause a shift in
the contrast. Display contrast can be adjusted by the user if necessary. However, changing the contrast requires that
the sensor housing be opened, thus declassif ication of the area is required.
To adjust the display contrast, remove the enclosure cover and use a jewelers screwdriver to turn the contrast
adjust screw located beneath the metallic face plate. The adjustment location is marked “CONTRAST”. See f igure 7
for location.
Detcon Model IR-622 Combustible Hydrocarbon Sensor PG.20