Communicating via modbus – Impulse 463E User Manual
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© Sealevel Systems, Inc.
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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
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
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