celioric
commented
11 years ago Hello Alphonseja,
With 13 devices sometimes the problem could be in the network... I am also starting using libmodbus, but usually when I have this king of problem with other softwares I start with some primary checks:
- How many register are you reading in every read request?
- Try create a network first with one device and than increase the number of devices in the network.
- Network speed should not be more than 9600bps for this size of network.
- Did you try using another modbus master? Try IOServer (www.ioserver.com) and watch the TX / RX telegrams and erros counters.
- Some times cheap RS232-RS485 converters can not handle very well the communication. Try ADAM-4520...
Alphonseja
stephane
We started using libmodbus library recently. We are reading data from 13 energy meters. We are using meters of two differennt companies. We have given 500 milli second delay between every requests. We are using RS - 232 to RS - 485 converter for reading data through the serial port of the computer. We are getting correct values from all the meters most of the time. But some times values are getting mixed up. That means, for example, we see Phase 12 voltage where Phase 1 voltage should be shown. Any work arounds? Please help.