5. Modbus
The probe can be accessed using the Modbus serial communication protocol. The supported
Modbus variant is Modbus RTU (Serial Modbus) over RS-485 interface.
For instructions on enabling the Modbus mode when you are using the probe with Vaisala
Industrial Protocol, see Enabling Modbus Mode from Vaisala Industrial Protocol (page 30).
For instructions on switching to Vaisala Industrial Protocol when the probe is in Modbus
mode, see Accessing Serial Commands from Modbus or Analog Mode (page 30).
For information on using Modbus with the Indigo 202 digital transmitter, see Using Modbus
with Indigo 202 (page 73).
The pre-configured default Modbus serial settings are presented in the following table.
Table 45 Default Modbus Serial Communication Settings
Description Default Value
Serial bit rate 19200
Parity N
Number of data bits 8
Number of stop bits 2
Modbus device address 240
More Information
‣
Function Codes (page 113)
‣
Modbus Registers (page 113)
Chapter 5 – Modbus
59
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