Modbus overview - INDIGO520 - INDIGO500SERIES - INDIGO510

Indigo510, Indigo520 User Guide

Document code
M212287EN
Revision
M
Language
English (United States)
Product
INDIGO520
INDIGO500SERIES
INDIGO510
Document type
User guide

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.

Note the following limitations of the Modbus implementation:
  • 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.