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如何使用 pymodbus 读取 Register 内容？

我正在尝试这段代码：

import pymodbus
from pymodbus.pdu import ModbusRequest
from pymodbus.client.sync import ModbusSerialClient as ModbusClient 
#initialize a serial RTU client instance
from pymodbus.transaction import ModbusRtuFramer

#count= the number of registers to read
#unit= the slave unit this request is targeting
#address= the starting address to read from

client = ModbusClient(method = 'rtu', port='/dev/extcomm/0/0', stopbits = 1, bytesize = 8, parity = 'N' , baudrate= 38400)

#Connect to the serial modbus server
 connection = client.connect()
 print(connection)

#Starting add, …