Function
Retrieves the slave ID that has been set.
Format
ret = modbus_get_slave( ctx )
Parameters
ctx [ VB.NET： IntPtr ] [ C, C++： modbus_t * ] [ C#： IntPtr ] [ Python： ctypes.POINTER(modbus_t) ]
Specify the pointer to the libmodbus structure.
Return values
ret [ VB.NET：Integer ] [ C, C++： int ] [ C#： int ] [ Python： ctypes.c_int ]
If the function succeeds, the slave ID is returned. If the function fails, -1 is returned, and the following error is stored in errno.
Definition |
Description |
EINVAL |
CTX is invalid. |
Remarks
Retrieves the slave ID that has been set in the specified Modbus structure.
Example
Retrieves the slave ID.
VB.NET |
Dim ret As Integer Dim ctx As IntPtr ret = modbus_get_slave(ctx)
|
C, C++ |
int ret; modbus_t *ctx; ret = modbus_get_slave(ctx);
|
C# |
int ret; IntPtr ctx; ret = modbus.GetSlave(ctx); |
Python |
ret = ctypes.c_int ctx = ctypes.POINTER(modbus_t) ret = modbus.modbus_get_slave(ctx) |