2.2. Interface settings

Use the Interface to Slave page to configure the interface to the slave.

The first four items in the page must always be configured:

The Interface Type and Packet Type together determine the variant of the Modbus protocol that will be used. The table below lists the possible combinations:

Table 1. Modbus protocol variants

Interface type Packet type Protocol variant
Serial RTU Modbus RTU
Serial ASCII Modbus ASCII
Serial TCP Not recommended since no error checking (non-standard)
TCP Socket RTU Modbus RTU encapsulated in TCP (non-standard)
TCP Socket ASCII Modbus ASCII encapsulated in TCP (non-standard)
TCP Socket TCP Modbus TCP
UDP Socket RTU Modbus RTU encapsulated in UDP (non-standard)
UDP Socket ASCII Modbus ASCII encapsulated in UDP (non-standard)
UDP Socket TCP Modbus UDP (also known as Modbus TCP encapsulated in UDP) (non-standard)

The following items must be configured for a socket interface:

The following items must be configured for a serial interface:

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