modbus-tk可以编写自己的modbus从站。在

下面是一个运行RTU服务器的示例，该服务器有100个保持寄存器，从地址0开始：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

finally:

server.stop()

if __name__ == "__main__":

main()

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