Detcon TP-624D - Manual (Page 33)

Model TP-624D
TP-624D Instruction Manual Rev. 0.4 Page 29 of 40
03/ 40014 Special #4 R/W Function Dependant on Value
06 of 40006 (See Special Register
Table)
03 40015 Calibration Status R 0x0000 Idle
0x0001 Zero Calibration Started
0x0002 Span Calibration Started
0x0003 Span Set
0x0004 Span Calibration Unsuccessful
06 40015 Calibration Enable W 0x0001 Set Zero
0x0002 Set Span
0x0008 Signal simulation mode
0x0009 Set FP Bridge Voltage
0x000A Set TP Heater Power
0x000B Set 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
03 40022 Special #5 R/W Function Dependant on Value
of 40006 (See Special Register
Table)
03 40023 Processor Firmware Version R 0x0102 Version 01.02
1 Units are determined by “units” field in the “notation” string
2 Span Gas must be less than or equal to Detectable Range and is usually about ½ of it.
3 Fault status bits self-reset when fault clears
4 Text in ASCII, in order L byte, H byte, L byte… See field descriptions of notation string.
Table 4 Notation Text String Description
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 field is terminated with an ASCII space (0x20)
Gas Type – This field contains the gas type of the cell (typically “H2S _ _ _”)
0x00 – The notation string is terminated with an ASCII null character