Gas Selection (0X0003); Model Type (0X0004); Software Rev (0X0005); Gain (0X0006) - General Monitors IR400 Manual

1.4.4 Gas Selection (0x0003)

Reads/Sets gas selection for the detector. This register is compatible with IR2100
Modbus. The register can be written with the index numbers 0 to 7 or with the Gas ID.
The Gas ID codes will not change in future versions and are consistent across General
Monitors products. To read the Gas ID use register 0x008D.
Index
0
1
2
3
4
5
6
7

1.4.5 Model Type (0x0004)

A Read returns the model type for the detector, which is 2104 in Decimal format.

1.4.6 Software Rev (0x0005)

A read returns the software revision of the IR400 in 2 ASCII characters. The most
significant byte is the first character, the least significant byte is the second character. For
example, if this register reads 0x2042 then the first digit is 0x20 (a space character) and
the second is 0x42 (the character B). So in this example the firmware version is " B".

1.4.7 Gain (0x0006)

A read returns the value of the gain. The difference between the initial value and the
present value indicates the dirt on the windows. This register is provided for compatibility
with the IR2100. A new register 0x0054 gives a beam block percentage which is scaled
in a much more convenient way.

1.4.8 Calibration IO type (0x0007)

When the Cal IO type is set to LED Magnet switch, LED is blinking during
zeroing/calibration and when the unit is in fault. Solenoid is disabled. If it is set to manual
solenoid or ARGC, the LED driver is disabled from blinking error codes etc. It then can be
used to drive a solenoid. A write command enables/disables the normal LED function.
The solenoid function cannot be used until the LED function is disabled.
Table 9. Gas Selection Codes
Gas Type
Methane
Propane
N Butane
Hexane
% by volume Methane
Special Order
Ethane
Pentane
13
Model IR400 MODBUS
Gas ID
100 ISO / 114 IEC
101 ISO / 115 IEC
104 ISO / 120 IEC
103 ISO / 121 IEC
106
Unique for Each Gas
102 ISO / 116 IEC
105 ISO / 117 IEC