I have trying a communication with a Unistream as a Slave and I'm having some problems. When I create a program on Unistream with 255 tags, the communication works ok and all address is read but when I add 1 more tag the program don’t work well. The master only can read about 175 address.
In this case it does not matter the specific address, but the number of tags in the program.
Does Unistream has a limitation on number of adress that can be read? Has anyone already had the same problem?
Do I understand you correctly that you are trying to read 255 registers at once via MODBUS? I believe there is a limit to how many registers you can read with a single Read Holding Registers command (a MODBUS limit, not Unitronics). Try breaking it up into multiple reads.