PST Michell Instruments S8000 -100, User Manual, Page: 55 / 68

S8000 -100 User Manual
Michell Instruments 47
APPENDIX B
Appendix B Modbus Register Map
Register Types
Type Description
uint16 unsigned 16 bit value
uint32 unsigned 32 bit value over two registers
Register names ending with _MS contain the upper 16 bits
Register names ending with _LS contain the lower 16 bits
flags unsigned 16 bit value where each bit represents a flag, value can be a combination of flags
float IEEE754 binary32 compatible floating point number
Register names ending with _MS contain the upper 16 bits including the sign and exponent
Register names ending with _LS contain the lower 16 bits
boolean unsigned 16 bit value with only two valid values, 0 = off/disabled/no, 1 = on/enabled/yes
Address Access Data Type Register Map Definition Max. Min. Default
Instrument Info
0 R|W|F uint16 MODBUS_ADDRESS 255 1 1
1 R uint16 INSTRUMENT_ID 42251 42251 42251
2 R uint32 INSTRUMENT_SERIAL_MS 4294967295 0 0
3 R INSTRUMENT _SERIAL_LS
4 R uint16 INSTRUMENT_FIRMWARE_VERSION 65535 0
Version * 1000 (1012 = 1.012)
5 R uint16 REGISTER_MAP_VERSION 65535 0
Version * 1000 (1012 = 1.012)
Measured and Calculated Values
6 R float DEWPOINT_MS [°C/°F] 1000 -1000 N/A
7 R DEWPOINT_LS [°C/°F]
8 R float AMBIENT_TEMP_MS [°C/°F] 1000 -1000 N/A
9 R AMBIENT_TEMP_LS [°C/°F]
10 R float PRESSURE_MS [P] 1000 -1000 N/A
11 R PRESSURE_LS [P]
12 R float RH_MS 100 0 N/A
13 R RH_LS
14 R float PPMV_MS 999999.9 0 N/A
15 R PPMV_LS
16 R float PPMW_MS 999999.9 0 N/A
17 R PPMW_LS
18 R float ABSOLUTE_HUMIDITY_MS 999999.9 0 N/A
19 R ABSOLUTE_HUMIDITY_LS
20 R float MIXING_RATIO_MS 2 0 N/A
21 R MIXING_RATIO_LS
22 R float WETBULB_MS [°C/°F] 1000 -1000 N/A
23 R WETBULB_LS [°C/°F]
24 R float WVP_MS 1000 -1000 N/A
25 R WVP_LS
26 R float FLOW_MS 2000 0 N/A
27 R FLOW_LS
28 R float PERCENT_VOLUME_MS 100 0 N/A
29 R PERCENT_VOLUME_LS
36 R uint16 TEMPERATURE_UNIT 1 0 0
0 = °C
1 = °F