"""
ModbusLink 异常定义模块
定义了所有ModbusLink库中使用的异常类型。
Exception Definition Module
Defines all exception types used in the ModbusLink library.
"""
from typing import Optional
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class ModbusLinkError(Exception):
"""
ModbusLink库的基础异常类
所有ModbusLink相关的异常都继承自这个基类。
Base exception class for ModbusLink library
All ModbusLink-related exceptions inherit from this base class.
"""
pass
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class ConnectionError(ModbusLinkError):
"""
连接错误异常
当无法建立或维持与Modbus设备的连接时抛出。
Connection error exception
Raised when unable to establish or maintain connection with Modbus device.
"""
pass
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class TimeoutError(ModbusLinkError):
"""
超时错误异常
当操作超过指定的超时时间时抛出。
Timeout error exception
Raised when operation exceeds the specified timeout period.
"""
pass
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class CRCError(ModbusLinkError):
"""
CRC校验错误异常
当接收到的数据帧CRC校验失败时抛出。
CRC validation error exception
Raised when CRC validation of received data frame fails.
"""
pass
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class InvalidResponseError(ModbusLinkError):
"""
无效响应错误异常
当接收到的响应格式不正确或不符合预期时抛出。
Invalid response error exception
Raised when received response format is incorrect or unexpected.
"""
pass
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class ModbusException(ModbusLinkError):
"""
Modbus协议异常
当从站返回Modbus异常码时抛出。
Modbus protocol exception
Raised when slave returns Modbus exception code.
Attributes:
exception_code: Modbus异常码 (如0x01, 0x02等) | Modbus exception code (e.g. 0x01, 0x02, etc.)
function_code: 原始功能码 | Original function code
"""
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def __init__(
self, exception_code: int, function_code: int, message: Optional[str] = None
):
self.exception_code = exception_code
self.function_code = function_code
if message is None:
message = f"Modbus异常 | Modbus Exception: 功能码 | Function Code 0x{function_code:02X}, 异常码 | Exception Code 0x{exception_code:02X}"
super().__init__(message)
def __str__(self) -> str:
exception_names = {
0x01: "非法功能码 | Illegal Function Code",
0x02: "非法数据地址 | Illegal Data Address",
0x03: "非法数据值 | Illegal Data Value",
0x04: "从站设备故障 | Slave Device Failure",
0x05: "确认 | Acknowledge",
0x06: "从站设备忙 | Slave Device Busy",
0x08: "存储奇偶性差错 | Memory Parity Error",
0x0A: "不可用网关路径 | Gateway Path Unavailable",
0x0B: "网关目标设备响应失败 | Gateway Target Device Failed to Respond",
}
exception_name = exception_names.get(
self.exception_code, "未知异常 | Unknown Exception"
)
return f"Modbus异常 | Modbus Exception (功能码 | Function Code: 0x{self.function_code:02X}, 异常码 | Exception Code: 0x{self.exception_code:02X} - {exception_name})"