Python 2.7 python pymodbus读保持寄存器

我是Modbus python新手，现在我对我的第一步有一些问题

剧本：

from pymodbus.client.sync import ModbusTcpClient

host = '10.8.3.10'
port = 502   

client = ModbusTcpClient(host, port)
client.connect()

#Register address 0x102A (4138dec) with a word count of 1
#Value - MODBUS/TCP Connections
#Access - Read
#Description - Number of TCP connections

request = client.read_holding_registers(0x3E8,10,unit=0) 
response = client.execute(request)

print response
#print response.registers
print response.getRegister(12)
print response.registers[8]
client.close()

结果是：

============= RESTART: D:\Users\mxbruckn\Desktop\read_modbus.py =============
ReadRegisterResponse (38)
0
0
>>> 

现在问题是：

我从寄存器1000读取10个字，从机编号为0。这是否正确，但值38是什么意思

如何读取寄存器1007中的2个单词？我的代码不工作：（0x3EF，2，单位=0）异常响应（131，3，非法值）

再见，

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Doc

首先，我认为您的代码中有一些错误。对于pymodbus 1.2.0，代码应如下所示：

from pymodbus.client.sync import ModbusTcpClient

host = 'localhost'
port = 502 

client = ModbusTcpClient(host, port)
client.connect()

rr = client.read_holding_registers(0x3E8,10,unit=0)
assert(rr.function_code < 0x80)     # test that we are not an error
print rr
print rr.registers


# read 2 registers starting with address 1007
rr = client.read_holding_registers(0x3EF,2,unit=0)
assert(rr.function_code < 0x80)     # test that we are not an error
print rr
print rr.registers

现在回答你的问题：

该值显示从服务器读取的寄存器数量

参见上面的代码

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希望对您有所帮助，wewa

通常，当您试图访问无效的寄存器地址或偏移量时，会出现非法值错误，请查看您是否真的在0x3EF、0x3F0和0x3F1处有寄存器，ReadRegisterResponse中的38是从您的请求返回的寄存器的长度。

ReadRegisterResponse (10)
[17, 17, 17, 17, 17, 17, 17, 17, 17, 17]
ReadRegisterResponse (2)
[17, 17]