0

我遇到了 python pymodbus3 模块的问题。

我有一个 modbus 设备和这两个脚本：

pymodbus_tester.py

#!/usr/bin/env python

from pymodbus.client.sync import ModbusSerialClient

if __name__ == '__main__':
    mdbcli = ModbusSerialClient(
        method   = "rtu",
        parity   = "N",
        stopbits = 1,
        bytesize = 8,
        timeout  = 1,
        port     = "/dev/ttyUSB0",
        baudrate = "115200"
    )

    if not mdbcli.connect():
        print("Could not connect to Modbus")

    print("""
********************************************************************
*****                  SINGLE READ TEST                        *****
********************************************************************
""")
    ret = mdbcli.read_input_registers(
        address = 0x3104,
        count   = 1,
        unit    = 0x01
    )
    print("Single read: {0}".format(ret))

pymodbus3_tester.py

#!/usr/bin/env python3

from pymodbus3.client.sync import ModbusSerialClient

if __name__ == '__main__':
    mdbcli = ModbusSerialClient(
        method   = "rtu",
        parity   = "N",
        stopbits = 1,
        bytesize = 8,
        timeout  = 1,
        port     = "/dev/ttyUSB0",
        baudrate = "115200"
    )

    if not mdbcli.connect():
        print("Could not connect to Modbus")

    print("""
********************************************************************
*****                  SINGLE READ TEST                        *****
********************************************************************
""")
    ret = mdbcli.read_input_registers(
        address = 0x3104,
        count   = 1,
        unit    = 0x01
    )
    print("Single read: {0}".format(ret))

如您所见，除了 pymodbus 模块之外，它们几乎相同。

然而，这是我在启动它们时得到的（为简单起见合并启动）：

griccardo@pc:~$ python pymodbus_tester.py ; echo "---------------" ; python3 pymodbus3_tester.py 

********************************************************************
*****                  SINGLE READ TEST                        *****
********************************************************************

Single read: ReadRegisterResponse (1)
---------------

********************************************************************
*****                  SINGLE READ TEST                        *****
********************************************************************

Single read: None

在设备端，我在两种情况下都收到相同的请求并输出相同的响应，正如您从以下日志中看到的（有点）：

REQ: '1~�'
RES: '�0'
REQ: '1~�'
RES: '�0

pymodbus3 模块有问题吗？还是我用错了？

谢谢你，里卡多

4

0 回答 0