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APPENDIX A-7: MODBUS Register Map Teledyne API - T300/T300M and M300E/EM PN 04906H (DCN5840)
A-36
MODBUS
Register Address
(dec., 0-based)
Description Units
40 Diagnostic test input (TEST_INPUT_7) mV
42 Diagnostic test input (TEST_INPUT_8) mV
44 Diagnostic temperature input (TEMP_INPUT_4)
C
46 Diagnostic temperature input (TEMP_INPUT_5)
C
48 Ground reference (REF_GND) mV
50 4096 mV reference (REF_4096_MV) mV
52
1
Purge pressure PSIG
54
1
Sample flow cc/m
56
1
Vacuum pressure "Hg
58
1
Internal box temperature #2/oven
C
60
1
Internal box temperature #2/oven control duty cycle Fraction
(0.0 = off,
1.0 = on full)
62
1
Auto-zero reading M/R
100
2
O
2
concentration %
102
2
O
2
concentration during zero/span calibration, just before computing
new slope and offset
%
104
2
O
2
slope —
106
2
O
2
offset %
108
2
O
2
sensor cell temperature
C
200
3
CO
2
concentration %
202
3
CO
2
concentration during zero/span calibration, just before
computing new slope and offset
%
204
3
CO
2
slope —
206
3
CO
2
offset %
MODBUS Floating Point Holding Registers
(32-bit IEEE 754 format; read/write in high-word, low-word order; read/write)
0 Maps to CO_SPAN1 variable; target conc. for range #1 Conc. units
2 Maps to CO_SPAN2 variable; target conc. for range #2 Conc. units
100
2
Maps to O2_TARG_SPAN_CONC variable %
200
3
Maps to CO2_TARG_SPAN_CONC variable %
04188D DCN5752