Owner's manual
Table Of Contents
- Table of Contents
- Introduction
- SeaI/O Hardware Description
- SeaI/O Base and Expansion Modules
- SeaI/O Module Common Features
- SeaI/O Configurations & Specifications
- 410 Series – 16 Optically Isolated Inputs/16 Reed Relay Outputs
- 420 Series – 16 Optically Isolated Inputs/8 Form C Outputs
- 430 Series – 32 Optically Isolated Inputs
- 440 Series – 32 Reed Relay Outputs
- 450 Series – 16 Form C Relay Outputs
- 462 Series – 96 Channel TTL DB-78
- 463 Series – 96 Channel TTL 50-Pin
- 470 Series – 16 A/D, 2 D/A, 8 24V Outputs, 8 Isolated Inputs
- 520 Series – 8 Optically Isolated Inputs/8 High-Current Form C Outputs
- Power Options
- Hardware Configuration
- Wiring Options
- Mounting Options
- Accessories
- SeaMAX Application Suite
- SeaI/O Architecture
- Device Address Configuration
- Configuring the “Base” SeaI/O Module
- Configuring N-Series Expansion Modules
- Configuring an Ethernet Module (E-Series)
- MaxSSD Configuration & Diagnostics Utility
- Communicating Via Modbus
- Extended Modbus Command Set
- Developing Custom Applications Using SeaMAX API
- SeaMAX API
- Non Object-Oriented SeaMAX API
- IOCTL Calls and Functionality
- Using SeaMAX with Visual C++ 6.0
- Using SeaMAX with Visual Basic 6.0
- Example SeaMAX Programming Tasks
- CEthernet API
- Appendix A – Data Encoding Tables
- Appendix B – CRC Calculation
- Appendix C – SeaIO Model 462/463 Holding Register Set
- Appendix D – SeaMAX Data Types and Structures
- Appendix E – Troubleshooting
- Appendix F – How To Get Assistance
- Appendix G – Compliance Notices
- Warranty
© 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 at www.modbus.org
.