Oldham 700 TP Series, Instruction Manual

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OLCT 700/710 TP
Page 28 of 45 Rev. C.1 OLCT 700/710 TP Instruction Manual
FC REG Content Description R/W Content Definition
Value Meaning Range
03
06
40015
40015
Calibration Status
Calibration Enable
R
W
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
03 40016 Read Text 1, first char in L R Two Char of Gas/Units String
6
03 40017 Read Text 2 R Two Char of Gas/Units String
6
03 40018 Read Text 3 R Two Char of Gas/Units String
6
03 40019 Read Text 4 R Two Char of Gas/Units String
6
03 40020 Read Text 5, last char in H R Two Char of Gas/Units String
6
03 40021 Text null terminator in L R Two Char of Gas/Units String
6
1
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
Character # 1 2 3 4 5 6 7 8 9 10 11
Description Units 0x20 Gas Type 0x00
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
REG 700/710 FP (40006 = 2) 700/710 IR (40006 = 3) 700/710 TP (40006 = 4)
1
40011 Gas Factor (R/W)
Range = 79 to 565
Gas Factor (R/W)
Range = 20 to 565
Heater Power (mW)
(R/W)
40012 Cal Factor (R/W)
Range = 79 to 565
Active Counts Heater Voltage (mV)
40013 Bridge Current (mA) Reference Counts Sensor Resistance
(x100 Ω)
40014 Bridge Voltage (mV)
(Read only)
Range Divisor
1,10,100, or 1000 Heater Current
(mA )
1
Only possible ranges are 20, 50, 100, 200. Modbus register 40001 will contain either 20, 50, 100, or 200, range divisor is not necessary.