IC or Gateway Returning Default Values – Modbus, SNP, Unifact

[Product_Support]

Issue

IC or Gateway is returning default values instead of expected data.

Product Line

Satchwell BAS & Sigma

Environment

• Sigma ICs and IC3s
• Building Automation System (BAS) PIUs
• Communication protocols: Modbus, SNP, Unifact

Cause

In Sigma, default values may appear due to misconfiguration or communication issues. These values reflect the defaults set within the object itself.

Resolution

1. Check for Extra Spaces

   • Open gateway.txt and select all content to reveal any hidden spaces.
   • Extra spaces can disrupt parsing and cause default values to be returned.
     

2. Verify Field Separators

   • Ensure input and output fields are separated by commas (,)
     

3. Commenting Format

   • User comments (e.g., "Temperature Sensor", "Setpoint") must be commented out using a semicolon (;) at the end of the line.
     

4. Communication Settings

   • In some gateway.txt files, IC/PIU communication protocols (e.g., Modbus) must be explicitly defined.
   • Confirm these settings match the third-party network configuration.

5. Modbus IC Configuration

   • Ensure gateway.txt is set to modbus or crompton as required by the applicati

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Troubleshooting Tips

To simplify problem-solving:

• Start with one gateway.txt entry and one connected controller on the third-party network.
• Disconnect all other controllers temporarily.
• Choose a mapped point with a known value in the third-party controller.
• Once confirmed working, reconnect additional controllers and map remaining points.