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
Setting Termination & Pull-Up/Pull-Down Resistors
A “stack” or “chain” of SeaI/O modules, connected via the pass-through connectors
or screw terminals on the left side of the enclosure, communicates via an RS-485 bus,
which must be properly terminated to work correctly. A set of three dipswitches is
located on the left side of enclosure, next to the “ADDR” rotary switch. These
switches control line termination and the RS-485 pull-up and pull-down resistors.
The pull-up and pull-down resistors ensure that the input ports are at a known state
when not being driven by the RS-485 line. In most cases, all three of the dipswitches
on each SeaI/O module should be in the down position, except the two end modules.
The first and last SeaI/O modules in the chain should have all three dipswitches in the
up (enabled) position.
NOTE:
Make sure that only the first and last SeaI/O modules have line
termination enabled (up position). Improper termination settings
can result in invalid data or communication failures.