Function
Sets the timeout period between bytes in Modbus communication.
Format
ret = modbus_set_byte_timeout( ctx , to_sec , to_usec )
Parameters
ctx [ C : modbus_t * ] [ Python：ctypes.POINTER(modbus_t) ]
Specify the pointer to the libmodbus structure.
to_sec [ C : uint32_t * ] [ Python : ctypes.POINTER(ctypes.c_uint32) ]
Specify the part of the timeout period that is more than 1 second (in unit of sec).
to_usec [ C : uint32_t * ] [ Python : ctypes.POINTER(ctypes.c_uint32) ]
Specify the part of the timeout period that is less than 1 second (in unit of usec).
Range of values : 0-999999
Return values
ret [ C : int ] [ Python : ctypes.c_int ]
If the function succeeds, 0 is returned. If the function fails, -1 is returned, and the following errno is set.
Definition |
Description |
EINVAL |
CTX is invalid. Or to_usec is more than 1000000. Or both to_sec and to_usec are set to 0. |
Remarks
The timeout setting between bytes in the same message in Modbus communication can be set.
Example
Sets the timeout period to 1.234 seconds.
C |
int ret; modbus_t *ctx; ret = modbus_set_byte_timeout(ctx, 1, 234000);
|
Python |
ret = ctypes.c_int ctx = ctypes.POINTER(modbus_t) ret = modbus.modbus_set_byte_timeout(ctx, 1, 234000) |