Indigo500 transmitters support the Modbus TCP/IP communication protocol (over Ethernet). The transmitter and the connected probes are treated as separate Modbus slaves, each with their own fixed unit identifier (unit ID) value.
- Use only one Modbus TCP/IP connection at a time. Design the system so that only one Modbus TCP/IP client accesses the transmitter.
- Modbus TCP/IP can process reliably only one Modbus transaction at a time. Reduce the polling rate of the client to avoid nested transactions.
The transmitter's Modbus response time is approximately 2000 ms. If the Modbus client gives a timeout error, increase the request timeout parameter.
The transmitter's Modbus server port is 502.