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Software Support for Windows OS
UcanReadUserPort
Syntax:
UCANRET PUBLIC UcanReadUserPort (
tUcanHandle
UcanHandle_p,
BYTE*
pbInValue_p);
Usability:
HW_INIT, CAN_INIT, version 2.16 or higher
Description:
Reads the current input value from the expansion port.
Parameter:
UcanHandle_p:
USB-CAN
handle
received
with
the
UcanInitHardware() or UcanInitHardwareEx().
function
pbInValue_p:
Address pointing to a variable that contains the read input
value following the successful return of this function. This
variable then contains the state of the 8-bit expansion port.
Each bit in this parameter corresponds to matching pin on
the expansion port.
Return value:
Error code of the function.
USBCAN_SUCCESSFUL
USBCAN_ERR_MAXINSTANCES
USBCAN_ERR_ILLHANDLE
USBCAN_ERR_BUSY
USBCAN_ERR_IOFAILED
USBCAN_ERR_ILLHW
USBCAN_ERR_ILLPARAM
USBCAN_ERR_DATA
USBCAN_ERR_ABORT
USBCAN_ERR_DISCONNECT
USBCAN_ERR_TIMEOUT
USBCAN_ERRCMD_…
Note:
After the USB-CANmodul has been connected to the PC, all expansion port pins are
configured as inputs (except sysWORXX modules, see above). This function can also be
used to read back the states of ports configured as outputs.
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