Contents

Revision and Copyright Information
Warranty and Assistance
IMPORTANT -- Please Read First
Table of Contents
SDM-IO16 16 Channel Input/Output Expansion Module
- 1. Introduction
- 2. Specifications
  - 2.1 General
  - 2.2 Port Specifications (Output Mode)
  - 2.3 Port Specifications (Input Mode)
  - 2.4 Pulse Counting Specifications
- 3. Power Considerations
- 4. Installation
  - 4.1 Terminal Connections
- 5. Address Selection Switches
- 6. Programming the Datalogger
  - 6.1 General Principles
  - 6.2 CRBasic Programming
    - 6.2.1 SDMIO16 Instruction
    - 6.2.2 SDMCD16AC Instruction
    - 6.2.3 SDMSpeed Instruction
  - 6.3 Edlog Programming
    - 6.3.1 Instruction 188 (CR10X and CR23X)
    - 6.3.2 Instructions 104 and 29 (CR10, CR7, 21X)
      - Instruction 104 SDM-CD16 used with CR10/10X, CR23X, CR7
  - 6.4 Command Codes for SDMIO16 Instruction and Instruction 188
- 7. Program Examples
  - 7.1 SDMIO16 Example
  - 7.2 A CR10X Program Using the Outputs for Control of a Greenhouse Heating and Cooling System.
  - 7.3 A CR10X Program which Measures Four Frequency Inputs (Anemometers) and Four Switch Closure Inputs (Rain Gauges)
  - 7.4 A CR10X Program that uses the Interrupt Subroutine in the Datalogger to Record the Time of Change of any one of the Ports on an SDM-IO16
Appendix A. General Principles of Pulse and Frequency Measurements
- A.1 Introduction
- A.2 Frequency and Duty Cycle Measurement Range
- A.3 Resolution of Frequency Measurements
- A.4 Resolution of Duty Cycle Measurements
- A.5 Debounce Filtering
Appendix B. Command Code Listing
Campbell Scientific Contact Information

Campbell Scientific SDM-IO16 Instruction Manual

Campbell Scientific SDM-IO16 Module manual cover

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Campbell Scientific SDM-IO16 Module Specification

The Campbell Scientific SDM-IO16 is a versatile I/O expansion module designed to enhance data acquisition and control capabilities in various monitoring systems. It provides 16 configurable digital input/output channels, allowing users to tailor functionality to specific application needs. Each channel on the SDM-IO16 can independently operate as an input or an output, making the module highly adaptable for diverse field conditions.

The module interfaces seamlessly with Campbell Scientific dataloggers using the SDM (Synchronous Device for Measurement) protocol, ensuring reliable communication. It supports high-frequency data collection and control tasks, with the ability to handle pulse counting, frequency measurement, and control of external devices. The SDM-IO16 is engineered for compatibility with a wide range of sensors and actuators, making it suitable for applications in environmental monitoring, industrial automation, and research.

The SDM-IO16 is housed in a durable enclosure, providing protection from environmental elements, and is designed to operate reliably in harsh conditions. It features robust electrical isolation between channels, which enhances system safety and prevents interference. The module is powered through the datalogger or an external power source, offering flexibility in deployment.

Installation and configuration of the SDM-IO16 are straightforward, facilitated by comprehensive documentation and support from Campbell Scientific. The module's design emphasizes low power consumption, a critical feature for remote and off-grid applications. With its combination of flexibility, reliability, and ease of integration, the SDM-IO16 serves as an essential component for expanding the capabilities of Campbell Scientific's data acquisition systems.

Campbell Scientific SDM-IO16 Module F.A.Q.

What is the primary function of the Campbell Scientific SDM-IO16 Module?

The SDM-IO16 Module is used for expanding the digital input/output capabilities of Campbell Scientific dataloggers, allowing for more complex control and monitoring solutions.

How do I connect the SDM-IO16 Module to a Campbell Scientific datalogger?

To connect the SDM-IO16 Module to a datalogger, use the provided SDM cable to link the module's SDM ports (C1, C2, C3) to the corresponding ports on the datalogger. Ensure that the power and ground connections are also properly established.

How can I troubleshoot a communication failure between the SDM-IO16 and the datalogger?

Check all cable connections for secure attachment, ensure that the datalogger is properly configured to recognize the SDM-IO16, and verify that the module is receiving adequate power. If issues persist, consult the user manual for diagnostic procedures.

What maintenance procedures are recommended for the SDM-IO16 Module?

Regularly check for and remove any dust or debris on the module, inspect cable connections for wear or damage, and verify that the system remains properly calibrated to ensure accurate operation.

How do I configure the SDM-IO16 to operate with my specific application?

Configuration involves setting up the correct addresses and modes using the datalogger's programming software. Refer to the SDM-IO16 user manual for detailed instructions on programming settings specific to your application needs.

What are the power requirements for the SDM-IO16 Module?

The SDM-IO16 requires a 12 V DC power supply. It is important to ensure that the power source is stable and within the specified voltage range to avoid damage to the module.

Can the SDM-IO16 Module be used in outdoor environments?

Yes, the SDM-IO16 can be used in outdoor environments, but it should be housed in an appropriate enclosure to protect it from environmental factors such as moisture, dust, and temperature extremes.

What should I do if the SDM-IO16 is not responding to commands?

First, check the module's power supply and connections. Ensure that the datalogger's programming is correct and that no address conflicts exist. If necessary, reset the module and verify its configuration settings.

How can I expand the number of digital inputs/outputs beyond what a single SDM-IO16 provides?

Multiple SDM-IO16 Modules can be daisy-chained to a single datalogger to expand the number of available inputs/outputs. Each module needs to be correctly addressed to avoid conflicts.

Are there any specific software requirements for programming the SDM-IO16 Module?

Programming the SDM-IO16 requires the use of Campbell Scientific's LoggerNet or PC400 software, which provides the necessary tools to configure and communicate with the module.