Function
Retrieves the external signal source (TTL/Photocoupler/Differential). Supports multi-processing.
Format
Ret = CntGetChannelSignal ( Id , ChNo , SigType )
Parameters
Id
[ VB.NET: Short ] [ C, C++: short ] [ C#: short ] [ Python: ctypes.c_short
]
Specify the device ID retrieved from CntInit.
ChNo
[ VB.NET: Short ] [ C, C++: short ] [ C#: short ] [ Python: ctypes.c_short
]
Specify the channel number for retrieving.
SigType
[ VB.NET: Short ] [ C, C++: short * ] [ C#: out short ] [ Python: ctypes.POINTER(ctypes.c_short)
]
Specify the address of the variable that stores the retrieved external
signal source. External signal source is returned in the following Definition
Value.
Definition |
Value |
Description |
CNT_SIGTYPE_ISOLATE |
0 |
Photocoupler |
CNT_SIGTYPE_TTL |
1 |
TTL |
CNT_SIGTYPE_LINERECEIVER |
2 |
Differential |
In the case of CNT-3204IN-USB, CNT_SIGTYPE_ISOLATE (photocoupler isolation) is returned regardless of the value selected by CntSelectChannelSignal.
Return Value
Ret [ VB.NET: Integer ] [ C, C++: long ] [ C#: int ] [ Python: ctypes.c_long ]
Definition |
Value |
Description |
CNT_ERR_SUCCESS |
0 |
Normality completion |
CNT_ERR_SYS_RECOVERED_FROM_STANDBY |
7 |
Execute the function CntResetDevice to return from the standby mode. |
CNT_ERR_DLL_INVALID_ID |
10001 |
Invalid ID was specified. |
CNT_ERR_DLL_CALL_DRIVER |
10002 |
CNT driver can't be called (Failed in the device I/O control). |
CNT_ERR_DLL_BUFF_ADDRESS |
10101 |
Invalid data buffer address. |
CNT_ERR_SYS_BOARD_EXECUTING |
20002 |
Cannot use while by another device works. |
CNT_ERR_SYS_CH_NO |
20201 |
Channel number is out of range. |
The others: (See also: Details of Error Code)
Initial Value
USB device, CPSN-CNT-3201I: Photocoupler
Other device :TTL
Remarks
Retrieves the external signal source of specified channel.
Example
Retrieves the external signal source of channel 0.
VB.NET |
Dim Ret As Integer |
C, C++ |
long Ret; |
C# |
int Ret; |
Python |
Ret = ctypes.c_long() |
See Also