Kirvukas

Hello, who has problems with Buffer, most common issue is that you are doing wrong compare with last message byte. Please check my attached photo for understanding.

Hello, We have a problem with Unitronics Jazz 2 series PLCs (JZ20-R31, +adapters MJ20-RS) trying to connect to modbus communication line. The problem is we cant initializate RS-485 com port, every configuration are restored to factory default (9600;7;1;even;n) after RS-485 cable connection to PLC and in system menu it is impossible to change communication parameters if RS-485 cable is connected (RS-232 com port we do not use). We do not have any problems with Jazz 1 series plcs using almost same program, same configuration. + U90 ladder we are using last version (v6.4.9) + Unitronics