批注：modbus_tkdefines.py

批注：modbus_tkdefines.py(1.1.2)

#!/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
"""

#modbus exception codes
ILLEGAL_FUNCTION = 1
ILLEGAL_DATA_ADDRESS = 2
ILLEGAL_DATA_VALUE = 3
SLAVE_DEVICE_FAILURE = 4
COMMAND_ACKNOWLEDGE = 5
SLAVE_DEVICE_BUSY = 6
MEMORY_PARITY_ERROR = 8

#supported modbus functions
READ_COILS = 1
READ_DISCRETE_INPUTS = 2
READ_HOLDING_REGISTERS = 3
READ_INPUT_REGISTERS = 4
WRITE_SINGLE_COIL = 5
WRITE_SINGLE_REGISTER = 6
READ_EXCEPTION_STATUS = 7
DIAGNOSTIC = 8
REPORT_SLAVE_ID = 17
WRITE_MULTIPLE_COILS = 15
WRITE_MULTIPLE_REGISTERS = 16
READ_WRITE_MULTIPLE_REGISTERS = 23
DEVICE_INFO = 43

#supported block types
COILS = 1
DISCRETE_INPUTS = 2
HOLDING_REGISTERS = 3
ANALOG_INPUTS = 4

第一部分：modbus exception codes：异常代码解释

如：

非法函数:1

非法的u数据u地址:2/

。

。

第二部分：supported modbus functions 支持的寄存器操作功能

读取线圈：1

读取离散输入：2

读取保持寄存器：3

读取输入寄存器：4

写入单个线圈：5

写入单个寄存器：6

读取异常状态：7

诊断：8

报告从机ID：17

写入多个线圈：15

写入多个寄存器：16

读写多个寄存器：23

设备信息：43

第三部分：supported block types 支持的块类型

线圈=1

离散输入=2

保持寄存器=3

模拟输入=4