Vaisala Indigo 520 - Appendix A: Modbus Reference; Unit Ids; Function Codes; Device Identification Objects

Appendix A. Modbus reference
A.1 Unit IDs
Table 18 Unit IDs of transmitter and probes
Device Unit ID
Transmitter 240
Probe connected to port 1 241
Probe connected to port 2 242
For probe-specific register information, see the connected probe's Modbus
documentation.
A.2 Function codes
Table 19 Modbus function codes
Function
code
(decimal)
Function code
(hexadecimal)
Name Notes
03 03
hex
Read Holding
Registers
Can be used only for reading probe
registers, for example, measurement
results, using unit ID 241 or 242. See the
connected probe's Modbus documentation
for a probe-specific register list.
43 / 14 2B
hex
/ 0E
hex
Read Device
Identification
Can be used only for reading transmitter
identification information using unit ID
240.
A.3 Device identification objects
Table 20 Device identification objects
Object id (decimal) Object id (hexadecimal) Object name Example contents
0 00
hex
VendorName “Vaisala”
1 01
hex
ProductCode "INDIGO520"
Appendix A – Modbus reference
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