CntGetCountDirection

Function

Gets the counting direction. (Up count/Down count)

Format

Ret = CntGetCountDirection ( Id , ChNo , Dir )

Parameters

Id [ C: short ] [ Python: ctypes.c_short ]
Specifies the device ID retrieved from CntInit.

ChNo [ C: short ] [ Python: ctypes.c_short ]
Specifies the channel number which you want to get for.

Dir [ C: short * ] [ Python: ctypes.POINTER(ctypes.c_short) ]
Specifies the address of the variable that stores the counting direction. As for the counting direction, either of the following defined values is returned.

Definition	Value	Description
CNT_DIR_DOWN	0	Down count
CNT_DIR_UP	1	Up count

Return Value

Ret [ C: long ] [ Python: ctypes.c_long ]

Definition	Value	Description
CNT_ERR_SUCCESS	0	Normal Complete
CNT_ERR_DLL_INVALID_ID	10001	Invalid ID is specified.
CNT_ERR_DLL_CALL_DRIVER	10002	Driver cannot be called (failed in ioctl).
CNT_ERR_SYS_CH_NO	20201	Channel number is outside the range.

The other errors: (See also: Details of Error Code)

Initial Value

Up count

Remarks

Gets the counting direction for the specified channel.

Example

C	Ret = CntGetCountDirection(Id, ChNo, &Dir);
Python	Ret = ccnt.CntGetCountDirection(Id, ChNo, ctypes.byref(Dir))