APPENDIX A-7: MODBUS Register Map Teledyne API - Models T400 and 400E (04402F DCN6340)
A-28
APPENDIX A-7: MODBUS Register Map
MODBUS
Register Address
(dec., 0-based)
Description Units
MODBUS Floating Point Input Registers
(32-bit IEEE 754 format; read in high-word, low-word order; read-only)
0 Photometer detector measure reading mV
2 Photometer detector reference reading mV
4 Photometer lamp stability %
6 Slope for range #1 —
8 Slope for range #2 —
10 Offset for range #1 PPB
12 Offset for range #2 PPB
14
Concentration for range #1 during zero/span calibration, just before
computing new slope and offset
PPB
16
Concentration for range #2 during zero/span calibration, just before
computing new slope and offset
PPB
18 Concentration for range #1 PPB
20 Concentration for range #2 PPB
22 Concentration stability PPB
24 Ozone generator reference detector reading mV
26 Ozone generator lamp drive mV
28 Ozone generator lamp temperature °C
30 Ozone scrubber temperature °C
32 Ozone scrubber temperature duty cycle Fraction
(1.0 = 100%)
34 Photometer lamp temperature °C
36 Photometer lamp temperature duty cycle Fraction
(1.0 = 100%)
38 Sample temperature °C
40 Sample flow rate cc/m
42 Sample pressure Inches Hg
44 Internal box temperature °C
46 Diagnostic test input (TEST_INPUT_7) mV
48 Diagnostic test input (TEST_INPUT_8) mV
50 Diagnostic temperature input (TEMP_INPUT_6) °C
52 Diagnostic temperature input (TEMP_INPUT_7) °C
54 Ground reference mV
56 Precision 4.096 mV reference mV
130
4
External analog input 1 value Volts
132
4
External analog input 1 slope eng unit /V
134
4
External analog input 1 offset eng unit
136
4
External analog input 2 value Volts
