Contents

Revision and Copyright Information
PLEASE READ FIRST
Table of Contents
1. Introduction
2. Precautions
3. Initial Inspection
4. Quickstart
5. Overview
- 5.1 Power Considerations
6. Specifications
- 6.1 Voltage Mode Output
- 6.2 Current Mode Output
- 6.3 Isolation
7. Installation
- 7.1 Connection to a Data Logger
- 7.2 Output Device Connections
  - 7.2.1 Voltage Output Mode
  - 7.2.2 Current Output Mode
  - 7.2.3 Shield and Ground Connections
  - 7.2.4 Output Terminal Connectors
- 7.3 Output Mode Setting
- 7.4 SDM Address Setting
8. Operation
- 8.1 Voltage or Current Signaling
- 8.2 Providing Excitation Supplies to Sensors
- 8.3 Data Logger Programming
  - 8.3.1 CRBasic SDMCVO4() Instruction
  - 8.3.2 SDMSpeed() Instruction
Appendix A. Importing Short Cut Code Into CRBasic Editor
Appendix B. Example Program
Limited Warranty
Assistance
Safety
Campbell Scientific Regional Offices

Campbell Scientific SDM-CVO4A Product Manual

Campbell Scientific SDM-CVO4A Peripheral manual cover

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Campbell Scientific SDM-CVO4A Peripheral Specification

The Campbell Scientific SDM-CVO4A is a precision peripheral device designed to interface with data loggers, providing four independently programmable analog voltage outputs. Each output can be set to a voltage range of -5 V to +5 V or 0 V to +10 V, offering flexibility for various control applications. The device is equipped with a high-resolution 16-bit digital-to-analog converter, ensuring accurate and stable voltage outputs suitable for precise control tasks. Communication with the SDM-CVO4A is facilitated through the Synchronous Device for Measurement (SDM) protocol, which allows for seamless integration with compatible Campbell Scientific data loggers. This protocol supports the addressing of up to 16 SDM-CVO4A units, enabling the expansion of systems to include up to 64 analog outputs.

The SDM-CVO4A features a robust design, capable of operating in a wide temperature range of -40°C to +70°C, making it suitable for use in harsh environmental conditions. The device is powered via a 12 V DC supply, commonly sourced from the connected data logger, ensuring efficient energy usage. Its compact form factor allows for easy installation in a variety of setups, while its low power consumption supports long-term deployment in remote field applications.

With its capability to generate high-resolution voltage signals, the SDM-CVO4A is ideal for applications such as driving proportional valves, controlling variable-speed motors, and other industrial automation tasks. The unit provides reliable performance, ensuring that users can achieve precise control over their systems, which is essential for optimizing the performance of complex monitoring and control solutions.

Campbell Scientific SDM-CVO4A Peripheral F.A.Q.

How do I connect the SDM-CVO4A to a data logger?

To connect the SDM-CVO4A to a data logger, use the SDM port on the data logger. Connect the SDM-CVO4A's SDM, C1, C2, and C3 lines to the corresponding terminals on the data logger. Ensure proper grounding and follow the wiring diagram provided in the manual.

What is the maximum cable length for connecting the SDM-CVO4A?

The maximum recommended cable length between the SDM-CVO4A and the data logger is 20 meters. Longer cables may result in signal degradation and communication issues.

How can I troubleshoot communication issues with the SDM-CVO4A?

Check the wiring connections to ensure they are secure and correct. Verify that the data logger's program is configured to communicate with the SDM-CVO4A. Use the data logger's diagnostic tools to check for any error messages or irregularities in communication.

What maintenance procedures are recommended for the SDM-CVO4A?

Regularly inspect the wiring and connections for signs of wear or corrosion. Ensure that the device is kept in a clean, dry environment. Periodically check the accuracy of the outputs by comparing with a known reference.

Can the SDM-CVO4A be used with other Campbell Scientific peripherals?

Yes, the SDM-CVO4A can be used in conjunction with other Campbell Scientific peripherals, as long as the data logger has sufficient SDM ports and processing capacity to handle the additional devices.

How do I calibrate the SDM-CVO4A outputs?

Calibration involves connecting a known reference voltage or current to the SDM-CVO4A and adjusting the output settings in the data logger program to ensure the readings match the reference. Detailed steps can be found in the device manual.

What should I do if the SDM-CVO4A outputs incorrect values?

First, verify that the input signals are within the specified range. Check the calibration settings and ensure they are correct. If issues persist, inspect the hardware for any damage or faults. Recalibration may be necessary.

Is it possible to use the SDM-CVO4A in extreme weather conditions?

The SDM-CVO4A is designed to operate within a specific temperature range, typically -25°C to 50°C. For extreme weather conditions, additional protective enclosures may be required to maintain optimal performance.

How do I update the firmware of the SDM-CVO4A?

Currently, the SDM-CVO4A does not support firmware updates as it relies on the data logger for processing and control. Ensure your data logger is running the latest firmware for optimal compatibility.

Can the SDM-CVO4A be used to control external devices?

Yes, the SDM-CVO4A can output analog signals to control external devices such as actuators or valves. Ensure the devices are compatible with the output voltage and current specifications of the SDM-CVO4A.