DioEchoBackByte

Function

Inputs a port (8 bits) for the status of an output port.

Format

Ret = DioEchoBackByte ( Id , PortNo , Data )

Parameters

Id [ VB.NET: Short ] [ C, C++: short ] [ C#: short ] [ Python: ctypes.c_short ]
Specify the device ID retrieved from DioInit.

PortNo [ VB.NET: Short ] [ C, C++: short ] [ C#: short ] [ Python: ctypes.c_short ]
Specify the logical output port number. The logical output port number is a number, which is allocated from the first output port of a device as 0 to the last one serially.

Data [ VB.NET: Byte ] [ C, C++: BYTE * ] [ C#: out byte ] [ Python: ctypes.POINTER(ctypes.c_ubyte) ]
Specify the address of the variable to store the output datum. The output datum is returned by hex number from 0H to FFH.

Return Value

Ret [ VB.NET: Integer ] [ C, C++: long ] [ C#: int ] [ Python: ctypes.c_long ]

Definition	Value [Dec]	Description
DIO_ERR_SUCCESS	0	Normal completed.
DIO_ERR_SYS_RECOVERED_FROM_STANDBY	7	Execute DioResetDevice function because the device has recovered from standby mode.
DIO_ERR_DLL_INVALID_ID	10001	Invalid ID specified.
DIO_ERR_DLL_CALL_DRIVER	10002	Not call the driver (Failure on DEVICE I/O CONTROL).
DIO_ERR_DLL_BUFF_ADDRESS	10100	Invalid data buffer address.
DIO_ERR_SYS_NOT_SUPPORTED	20001	This board couldn't use this function.
DIO_ERR_SYS_PORT_NO	20100	Port No. beyond the limit.

The others (See also: Details of Error Code)

Initial Value

The initial value of the output datum is 0 after the device is reset. (DIO-0808RN-USB is set to FFH)

Remarks

Inputs a port (8 bits) for the status of an output port. The output datum is returned by hex number from 0H to FFH.
This function is used for monitoring the outputting contents.

Example

Inputs the status of output port 0.

VB.NET	Dim Ret As Integer Dim Data As Byte Ret = DioEchoBackByte ( Id , 0 , Data )
C, C++	long Ret; BYTE Data; Ret = DioEchoBackByte ( Id , 0 , &Data );
C#	int Ret; byte Data; Ret = dio.EchoBackByte ( Id , 0 , out Data );
Python	Ret = ctypes.c_long() Data = ctypes.c_ubyte() Ret.value = cdio.DioEchoBackByte ( Id , 0 , ctypes.byref(Data) )