GIT地址：https://github.com/ljean/modbus-tk

找到modbus rtu slaver 例程

用宝塔将例程复制到centos目录

#!/usr/bin/env python

# -*- coding: utf_8 -*-

"""

Modbus TestKit: Implementation of Modbus protocol in python

(C)2009 - Luc Jean - luc.jean@gmail.com

(C)2009 - Apidev - http://www.apidev.fr

This is distributed under GNU LGPL license, see license.txt

"""

import sys

import modbus_tk

import modbus_tk.defines as cst

from modbus_tk import modbus_rtu

import serial

PORT = 0

#PORT = '/dev/ptyp5'

def main():

"""main"""

logger = modbus_tk.utils.create_logger(name="console", record_format="%(message)s")

#Create the server

server = modbus_rtu.RtuServer(serial.Serial(PORT))

try:

logger.info("running...")

logger.info("enter 'quit' for closing the server")

server.start()

slave_1 = server.add_slave(1)

slave_1.add_block('0', cst.HOLDING_REGISTERS, 0, 100)

while True:

cmd = sys.stdin.readline()

args = cmd.split(' ')

if cmd.find('quit') == 0:

sys.stdout.write('bye-bye\r\n')

break

elif args[0] == 'add_slave':

slave_id = int(args[1])

server.add_slave(slave_id)

sys.stdout.write('done: slave %d added\r\n' % (slave_id))

elif args[0] == 'add_block':

slave_id = int(args[1])

name = args[2]

block_type = int(args[3])

starting_address = int(args[4])

length = int(args[5])

slave = server.get_slave(slave_id)

slave.add_block(name, block_type, starting_address, length)

sys.stdout.write('done: block %s added\r\n' % (name))

elif args[0] == 'set_values':

slave_id = int(args[1])

name = args[2]

address = int(args[3])

values = []

for val in args[4:]:

values.append(int(val))

slave = server.get_slave(slave_id)

slave.set_values(name, address, values)

values = slave.get_values(name, address, len(values))

sys.stdout.write('done: values written: %s\r\n' % (str(values)))

elif args[0] == 'get_values':

slave_id = int(args[1])

name = args[2]

address = int(args[3])

length = int(args[4])

slave = server.get_slave(slave_id)

values = slave.get_values(name, address, length)

sys.stdout.write('done: values read: %s\r\n' % (str(values)))

else:

sys.stdout.write("unknown command %s\r\n" % (args[0]))

finally:

server.stop()

if __name__ == "__main__":

main()

查看centos串口号

[root@bogon /]# cat /proc/tty/driver/serial

serinfo:1.0 driver revision:

0: uart:16550A port:000003F8 irq:4 tx:0 rx:0 CTS|DSR|CD

1: uart:16550A port:000002F8 irq:3 tx:40867 rx:13240 DSR|CD

2: uart:unknown port:000003E8 irq:4

3: uart:unknown port:000002E8 irq:3

[root@bogon /]# ls -l /dev/ttyS*

crw-rw---- 1 root dialout 4, 64 12月 18 11:29 /dev/ttyS0

crw-rw---- 1 root dialout 4, 65 12月 18 12:39 /dev/ttyS1

crw-rw---- 1 root dialout 4, 66 12月 18 11:29 /dev/ttyS2

crw-rw---- 1 root dialout 4, 67 12月 18 11:29 /dev/ttyS3

[root@bogon /]#

这里我用的

/dev/ttyS1

刚才复制的例程

修改

PORT = 0

#PORT = '/dev/ptyp5'

为

#PORT = 0

PORT = '/dev/ttyS1'

centos下运行例程

python licheng.py

输出

RtuServer /dev/ttyS1 is opened

running...

enter 'quit' for closing the server

输入

set_values 1 0 0 1 2 3 4 5 6 7 8 9 10

返回

done: values written: (1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

modbus poll

原文链接:https://blog.csdn.net/taogunet/article/details/111410138