Communicating via modbus – Impulse 463E User Manual

Page 57

© Sealevel Systems, Inc.

- 54 -

SeaI/O User Manual

Communicating Via Modbus

Modbus Commands

Sealevel SeaI/O modules are designed to integrate seamlessly into existing Modbus
networks. The supported command set will vary depending on the SeaI/O model
number used. Below is a list of valid commands for each SeaI/O model number.

SeaI/O 410

SeaI/O 420

SeaI/O 430

0x01 Read Coils
0x02 Read Discrete Inputs
0x05 Write Single Coil
0x0F Write Multiple Coils

0x02 Read Discrete Inputs

SeaI/O 440

SeaI/O 450

SeaI/O 462/463

0x01 Read Coils
0x05 Write Single Coil
0x0F Write Multiple Coils

0x41 Read PIO Data
0x42 Write PIO Data
0x43 Read PIO Config
0x44 Write PIO Config

SeaI/O 470

SeaI/O 520

0x01 Read Coils
0x02 Read Discrete Inputs
0x05 Write Single Coil
0x0F Write Multiple Coils
0x04 Read Input Register
0x06 Write Single Register
0x10 Write Multiple Reg.

0x01 Read Coils
0x02 Read Discrete Inputs
0x05 Write Single Coil
0x0F Write Multiple Coils

Specialized diagnostic commands and other RTU specific codes are not supported at
this time. An overview of the Modbus specification for both RTU and TCP
connections is covered in subsequent sections. The official Modbus specification can
be found at