Function
Gets the digital filter value.
Format
Ret = CntGetDigitalFilter ( Id , ChNo , FilterValue )
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.
FilterValue
[ C: short * ] [ Python: ctypes.POINTER(ctypes.c_short) ]
Specifies the address of variable that stores the coefficient for the digital
filter value. As for digital filter value, a coefficient in the following
table is returned.
Coefficient |
Devices with high-performance counter |
Devices with Usual Counter |
0h |
Not used |
0.1us |
1h |
0.1μs |
6.5us |
2h |
0.2μs |
25.7us |
3h |
0.4μs |
32.1us |
4h |
0.8μs |
204.9us |
5h |
1.6μs |
211.3us |
6h |
3.2μs |
230.5us |
7h |
6.4μs |
236.9us |
8h |
12.8μs |
819.3us |
9h |
25.6μs |
825.7us |
Ah |
51.2μs |
844.9us |
Bh |
102.6μs |
851.3us |
Ch |
204.8μs |
1024.1us |
Dh |
409.6μs |
1030.5us |
Eh |
819.2μs |
1049.7us |
Fh |
1638.4μs |
1056.1us |
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
Coefficient=0
Remarks
Gets the digital filter for the specified channel.
Example
C |
Ret
= CntGetDigitalFilter(Id, ChNo, &FilterValue); |
Python |
Ret
= ccnt.CntGetDigitalFilter(Id, ChNo, ctypes.byref(FilterValue)) |
See Also
CntSetDigitalFilter