Function
Sets the slave ID.
Format
ret = modbus_set_slave( ctx , slave )
Parameters
ctx [ C : modbus_t * ] [ Python : ctypes.POINTER(modbus_t) ]
Specify the pointer to the libmodbus structure.
slave [ C : int ] [ Python : ctypes.c_int ]
Specify the slave ID.
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 error is stored in errno.
Definition |
Description |
EINVAL |
Slave ID is invalid. |
Remarks
Sets the slave ID for the specified Modbus structure.
Example
Sets slave ID 1.
C |
int ret; modbus_t *ctx; ret = modbus_set_slave(ctx, 1);
|
Python |
ret = ctypes.c_int ctx = ctypes.POINTER(modbus_t) ret = modbus.modbus_set_slave(ctx, 1) |