This is the list of error codes (errno) in libmodbus.
Please refer to the function reference for the return value of each function.
Definition |
Value |
Meaning |
EMBXILFUN |
112345679 |
The function code is invalid. |
EMBXILADD |
112345680 |
The specified address is invalid. |
EMBXILVAL |
112345681 |
The data is invalid. |
EMBXSFAIL |
112345682 |
The Modbus slave is stopped. |
EMBXACK |
112345683 |
ACK response. |
EMBXSBUSY |
112345684 |
The Modbus slave is busy. |
EMBXNACK |
112345685 |
Negative Ack response. |
EMBXMEMPAR |
112345686 |
Memory parity error. |
EMBXGPATH |
112345687 |
The gateway is not configured properly or is overloaded. |
EMBXGTAR |
112345688 |
It indicates that no response was obtained from the target device. |
EMBBADCRC |
112345689 |
CRC error. |
EMBBADDATA |
112345690 |
The sent data or the received data is invalid. |
EMBBADEXC |
112345691 |
An unexpected exception code is received. |
EMBUNKEXC |
112345692 |
Reservation code |
EMBMDATA |
112345693 |
The number of requested data exceeds the maximum value of Modbus. |
EMBBADSLAVE |
112345694 |
The request slave ID and the receive slave ID are different. |
In addition to the Modbus error codes defined in libmodbus, you may also get a general errno.
For more information about errno, please refer to the following URL.
https://learn.microsoft.com/en-us/cpp/c-runtime-library/errno-constants?view=msvc-160