OLCT 700/710 TP
Page 28 of 45 Rev. C.1 OLCT 700/710 TP Instruction Manual
Calibration Status
Calibration Enable
0x0000
0x0001
0x0002
0x0003
0x0004
0x0001
0x0002
0x0008
0x0009
0x000A
0x000B
Idle
Zero Calibration Started
Span Calibration Started
Span Set
Span Calibration Unsuccessful
Set Zero
Set Span
Signal simulation mode
Set OLCT 700/710 FP Bridge Voltage
Set OLCT 700/710 TP Heater Power
Set OLCT 700/710 IR Gain
Read Text 1, first char in L
Two Char of Gas/Units String
6
Two Char of Gas/Units String
6
Two Char of Gas/Units String
6
Two Char of Gas/Units String
6
Read Text 5, last char in H
Two Char of Gas/Units String
6
Text null terminator in L
Two Char of Gas/Units String
6
Integer ranges from 1 all the way to 10,000.
2
Units are determined by “units” field in the “notation” string
3
Gas Reading times one (x 1) with units in notation string for “Low Range” = 0. Gas Reading times one (x 10) with units in notation string for
“Low Range” = 1. Gas Reading times one (x 100) with units in notation string for “Low Range” = 2.
4
Span Gas must be less than or equal to Detectable Range and is usually about ½ of it.
5
Fault status bits self-reset when fault clears
6
Text in ASCII, in order L byte, H byte, L byte… See field descriptions of notation string.
Gas/Units String
Units – This field is ‘PPM’, ‘PPB’, or ‘_ _ %’ (where ‘ _ ‘ is a space, 0x20).
0x20 – The units filed is terminated with an ASCII space (0x20)
Gas Type – This field contains the gas type of the cell. Any ASCII string is permissible
0x00 – The notation string is terminated with an ASCII null character
Table 4: Modbus™ Special Registers
Gas Factor (R/W)
Range = 79 to 565
Gas Factor (R/W)
Range = 20 to 565
Cal Factor (R/W)
Range = 79 to 565
Sensor Resistance
(x100 Ω)
Bridge Voltage (mV)
(Read only)
Range Divisor
1,10,100, or 1000
Only possible ranges are 20, 50, 100, 200. Modbus register 40001 will contain either 20, 50, 100, or 200, range divisor is not necessary.
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