七、Modbus工具

# -*- coding: utf-8 -*-
"""
Spyder Editor

This is a temporary script file.
"""

from modbus_tk import defines as funCode
from modbus_tk.modbus_rtu import RtuServer
import serial
import time
from modbus_tk import hooks

#
server = RtuServer(serial.Serial(port='/dev/tty.wchusbserial1420', baudrate=115200, bytesize=8, parity='N', stopbits=1, xonxoff=0))
# server = RtuServer(serial.Serial(port=0, baudrate=38400, bytesize=8, parity='N', stopbits=1, xonxoff=0))
slave = server.add_slave(1)

def before_handle_request_hook(argument):
#     print('modbus_rtu.RtuServer.before_write')
data = argument[1]
strData = 'RX: '
for i in argument[1]:
strData = strData + '0x%02x ' %(i)
print(strData)

def after_handle_request_hook(argument):
#     print('modbus_rtu.RtuServer.after_read')
strData = 'TX: '
for i in argument[1]:
strData = strData + '0x%02x ' %(i)
print(strData)

def slave_init():
slave.add_block('holdingReg', funCode.HOLDING_REGISTERS, 0x2000, 20)
hooks.install_hook('modbus.Server.before_handle_request', before_handle_request_hook)
hooks.install_hook('modbus.Server.after_handle_request', after_handle_request_hook)

def slave_poll():
server.start()
print('server.start....')
while True:
data = slave.get_values('holdingReg', 0x2000, 20)
#print(type(data))
data = data
time.sleep(1)

def slave_stop():
server.stop()

if __name__ == '__main__':
slave_init()
try:
slave_poll()
except KeyboardInterrupt:
slave_stop()