CntSelectChannelSignal

Function

Select the external signal source. (TTL/Photocoupler/Differential)

Format

Ret = CntSelectChannelSignal ( Id , ChNo , SigType )

Parameters

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

ChNo [ C, C++ : short] [Python: ctypes.c_short]
Specifies the channel number which you want to set.

SigType [ C, C++ : short] [Python: ctypes.c_short]
Specifies the external signal source. Select the external signal source from the following defined values.

Definition	Value	Description
CNT_SIGTYPE_ISOLATE	0	Photocoupler insulation
CNT_SIGTYPE_TTL	1	TTL
CNT_SIGTYPE_LINERECEIVER	2	Differential

Return Value

Ret [ C, 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_DLL_MODE	10100	Invalid mode setting.
CNT_ERR_SYS_MODE	20100	Invalid mode setting.
CNT_ERR_SYS_CH_NO	20201	Channel number is outside the range.

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

Initial Value

CNT24-4(PCI)H	Photocoupler insulation
CNT24-4D(PCI)H	Differential
CNT-3204MT-LPE CNT32-4MT(LPCI)	TTL
CNT-3208M-PE CNT32-8M(PCI)	TTL
CNT-3204IN-ETH CNT-3204IN-USB	Photocoupler insulation
CPI-CNT-3201I CPS-CNT-3202I CPSN-CNT-3201I CPSN-CNT-3201I2	Photocoupler insulation

Remarks

Specifies the external signal source for the specified channel.
The setting in this function is effective after the counter starts.

Specifications based on devices

CNT24-4(PCI)H	Usable SigType is Photocoupler insulation or TTL.
CNT24-4D(PCI)H	Usable SigType is Differential or TTL.
CNT-3204MT-LPE CNT32-4MT(LPCI)	Usable SigType is TTL.
CNT-3208M-PE CNT32-8M(PCI)	Usable SigType is Differential or TTL.
CNT-3204IN-ETH CNT-3204IN-USB	Usable SigType is Photocoupler insulation. Selecting TTL or Differential will not result in an error, but the device will be configured with Photocoupler insulation.
CPI-CNT-3201I CPS-CNT-3202I CPSN-CNT-3201I CPSN-CNT-3201I2	Usable SigType is Photocoupler insulation.

Example

C, C++	Ret = CntSelectChannelSignal ( Id , ChNo , SigType );
Python	Ret = ccnt.CntSelectChannelSignal ( Id , ChNo , SigType )