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This Knowledge Base provides clear answers about compressed air monitoring and SUTO iTEC products. Topics include installation, choosing the right instruments, and solving common issues. We update this section regularly with new content. If you cannot find the information you need, please contact us.

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Why is my flow meter not detected?

Modbus communication problems are often caused by wiring errors, wrong address settings, reversed lines or unstable power supply.

Possible causes:
  • The wiring might be incorrect or the cable could be damaged.
  • The Modbus communication lines (D+ and D−) may be reversed.
  • If you’re using Modbus TCP, the sensor might be connected directly to a PC instead of through a network switch or hub.
  • The configured Modbus address might not match the sensor’s actual address.
  • The sensor may not be powered or the supply voltage could be too low.
Solutions:
  • Compare the wiring with the sensor’s user manual to ensure all connections are correct.
  • Use a multimeter to check for a stable 24 VDC power supply.
  • Test the cable for continuity or try a known working replacement cable.
  • Verify the Modbus address and communication settings using the S4C-FS configuration software.
  • Ensure the cable from the splitter to the sensor is shorter than 30 cm for proper detection.
  • Use the S4C-FS software’s address scan function to detect the sensor on the network.
Tags: detection error, device not detected, flow meter not found, no Modbus connection, no signal, S401, S415, S418, S421, S430, S451, S453, sensor startup, wiring issue
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