Appendix A _________________________________________________________ Modbus Reference
VAISALA ________________________________________________________________________ 75
APPENDIX A
MODBUS REFERENCE
This appendix describes the Modbus protocol implementation of the
HMP60/HMP110 series probes. For information on Modbus
communication and instructions on accessing Modbus mode and
configuring the communication settings, see Modbus Communication on
- Supported Modbus functions are described in Table 17 below.
- Supported measurement and configuration registers are described in
- Device identification objects are described in Table 19 on page 78.
- Communication test registers are described in Table 20 on page 78.
Supported Modbus Functions
Table 17 below lists the function codes supported in the
HMP60/HMP110 series Modbus RTU implementation.
Table 17
Supported Function Codes
Function
Code
(decimal)
Function Code
(hexadecimal)
Function Name
(as defined by the specification)
Notes
3
03
Read Holding Registers
for available registers.
16
10
Write Multiple Registers
for available registers.
43 14
2B 0E
Read Device Identification
for available device
identification objects.
NOTE
After power-up, wait for two seconds before sending Modbus requests.
