J2mod Library Here

You need to specify: Port name (e.g., /dev/ttyUSB0 or COM3 ), baud rate, data bits, parity, and stop bits.

dependencies implementation 'com.github.kochedykov:j2mod:master-SNAPSHOT' j2mod library

You need a ModbusTCPMaster and a TCPMasterConnection . You need to specify: Port name (e

Incorrect baud rate, parity, or stop bits. Also, poor shielding on RS-485 cables. Fix: Verify serial parameters exactly against the slave manual. Use a serial sniffer (like Wireshark or Serial Monitor) to inspect raw bytes. /dev/ttyUSB0 or COM3 )

// Send the request and get the response ReadHoldingRegistersResponse response = (ReadHoldingRegistersResponse) master.send(request);