Python examples KMtronic Modbus LAN TCP/IP to Modbus RS485 RTU Serial Converter: testing MODBUS LED Display
Pymodbus is a full Modbus protocol implementation using twisted for its asynchronous communications core.
import struct from struct import * from pymodbus.client.sync import ModbusTcpClient # from pymodbus.client.sync import ModbusSerialClient as ModbusClient import logging logging.basicConfig() log = logging.getLogger() log.setLevel(logging.DEBUG) // IP KMtronic Modbus LAN TCP/IP to Modbus RS485 RTU Serial Converter host = '192.168.1.199' port = 502 client = ModbusTcpClient(host, port) # client = ModbusClient(method='rtu', port='/dev/ttyUSB0', timeout=1) client.connect() # First digital input address address = 0 # Written value value = 1221 # It will send '1221' to the output client.write_register(address, value, unit=1) print "-----------------------------"
Output
kr@ubuntu-server:/var/www/html/python-test$ python ModBus-LED-Display.py DEBUG:pymodbus.transaction:Current transaction state - IDLE DEBUG:pymodbus.transaction:Running transaction 1 DEBUG:pymodbus.transaction:SEND: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x6 0x0 0x0 0x4 0xc5 DEBUG:pymodbus.client.sync:New Transaction state 'SENDING' DEBUG:pymodbus.transaction:Changing transaction state from 'SENDING' to 'WAITING FOR REPLY' DEBUG:pymodbus.transaction:Changing transaction state from 'WAITING FOR REPLY' to 'PROCESSING REPLY' DEBUG:pymodbus.transaction:RECV: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x6 0x0 0x0 0x4 0xc5 DEBUG:pymodbus.framer.socket_framer:Processing: 0x0 0x1 0x0 0x0 0x0 0x6 0x1 0x6 0x0 0x0 0x4 0xc5 DEBUG:pymodbus.factory:Factory Response[WriteSingleRegisterResponse: 6] DEBUG:pymodbus.transaction:Adding transaction 1 DEBUG:pymodbus.transaction:Getting transaction 1 DEBUG:pymodbus.transaction:Changing transaction state from 'PROCESSING REPLY' to 'TRANSACTION_COMPLETE' ----------------------------- kr@ubuntu-server:/var/www/html/python-test$
