Teledyne T300 Operation Manual page 382

APPENDIX A-7: MODBUS Register Map
MODBUS
Register Address
(dec., 0-based)
40
42
44
46
48
50
1
52
1
54
1
56
1
58
1
60
1
62
2
100
2
102
2
104
2
106
2
108
3
200
3
202
3
204
3
206
(32-bit IEEE 754 format; read/write in high-word, low-word order; read/write)
0
2
2
100
3
200
A-36
Description
Diagnostic test input (TEST_INPUT_7)
Diagnostic test input (TEST_INPUT_8)
Diagnostic temperature input (TEMP_INPUT_4)
Diagnostic temperature input (TEMP_INPUT_5)
Ground reference (REF_GND)
4096 mV reference (REF_4096_MV)
Purge pressure
Sample flow
Vacuum pressure
Internal box temperature #2/oven
Internal box temperature #2/oven control duty cycle
Auto-zero reading
O concentration
2
O concentration during zero/span calibration, just before computing
2
new slope and offset
O slope
2
O offset
2
O sensor cell temperature
2
CO concentration
2
CO concentration during zero/span calibration, just before
2
computing new slope and offset
CO slope
2
CO offset
2
MODBUS Floating Point Holding Registers
Maps to CO_SPAN1 variable; target conc. for range #1
Maps to CO_SPAN2 variable; target conc. for range #2
Maps to O2_TARG_SPAN_CONC variable
Maps to CO2_TARG_SPAN_CONC variable
Teledyne API - T300/T300M and M300E/EM PN 04906H (DCN5840)
Units
mV
mV
C
C
mV
mV
PSIG
cc/m
"Hg
C
Fraction
(0.0 = off,
1.0 = on full)
M/R
%
%
—
%
C
%
%
—
%
Conc. units
Conc. units
%
%
06864B DCN6314