Measurement Computing Personal488 rev.3.0 - Manual (Page 77)

Personal488 for Windows 95/98/Me/NT/2000 04-10-01 API Reference 6-9
ControlLine
Syntax INT WINAPI ControlLine(DevHandleT devHandle);
ControlLine returns a bit mapped number.
devHandle refers to the I/O adapter. If devHandle refers to an external device, the
ControlLine command acts on the hardware interface to which the external device
is attached.
Response -1 if error
otherwise, a bit map of the current state of the IEEE 488 interface. Under 32-bit Driver488
software, serial interfaces are no longer supported.
Bus States None
Example result = ControlLine(ieee);
printf(“The response is %X\n”,result);
See Also TimeOut
The ControlLine command may be used only on IEEE 488 devices. Under 32-bit Driver488 software,
serial interfaces are no longer supported. This command returns the status of the IEEE 488 bus control
lines as an 8-bit unsigned value (bits 2 and 1 are reserved for future use), as indicated below.
Bit 8 Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1
EOI SRQ NRFD NDAC DAV ATN 0 0