Measurement-computing Personal488 rev.3.0 For DOS & Windows 3.Xi Uživatelský manuál Strana 332

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III. COMMAND REFERENCES - 15. Command References 15B. Driver488/SUB, W31, W95, & WNT
Personal488 Users Manual, Rev. 3.0 III-317
Clear
SYNTAX
int pascal Clear(DevHandleT devHandle);
devHandle
refers to either an IEEE 488 hardware interface or an external device.
If
devHandle
refers to a hardware interface, then a Device Clear (
DCL
) is
sent. If
devHandle
refers to an external device, a Selected Device Clear
(
SDC
) is sent.
RETURNS
-1 if error
MODE
CA
BUS STATES
ATN
DCL (all devices)
ATN
UNL, MTA, LAG, SDC (selected device)
SEE ALSO
Reset, ClearList
EXAMPLES
errorcode = Clear(ieee);
Sends the Device Clear (DCL) command to the
interface board
errorcode = Clear(wave)
Sends the Selected Device Clear (SDC) command to
the WAVE
errorcode = Clear(dmm)
Sends the Selected Device Clear (SDC) command to
the DMM
The
Clear
command causes the Device Clear (
DCL
) bus command to be issued to an interface or a
Selected Device Clear (
SDC
) command to be issued to an external device. IEEE 488 bus devices that
receive a Device Clear or Selected Device Clear command normally reset to their power-on state.
ClearList
SYNTAX
int pascal ClearList(DevHandlePT devHandles);
devHandles
is a pointer to a list of device handles that refer to external devices.
If a hardware interface is in the list,
DCL
is sent instead of
SDC
.
RETURNS
-1 if error
MODE
CA
BUS STATES
ATN
DCL (all devices)
ATN
UNL, MTA, LAG, SDC (selected device)
SEE ALSO
Clear, Reset
EXAMPLES
deviceList[0] = wave;
deviceList[1] = scope;
deviceList[2] = dmm;
deviceList[3] = NODEVICE;
errorcode = ClearList(deviceList);
Sends the Selected Device Clear
(SDC) command to a list of
devices.
The
ClearList
command causes the Selected Device Clear (
SDC
) command to be issued to a list of
external devices. IEEE 488 bus devices that receive a Selected Device Clear command normally reset
to their power-on state.
ClockFrequency
Driver488/SUB and Driver488/W31 only
SYNTAX
int pascal ClockFrequency(DevHandleT devHandle,int freq);
devHandle
refers to either an IEEE 488 Interface or an external device. If
devHandle
refers to an external device, the
ClockFrequency
command acts
on the hardware interface to which the external device is attached.
freq
is the actual clock rate rounded up to the nearest whole number of MHz.
RETURNS
-1 if error
MODE
Any
BUS STATES
None
SEE ALSO
Reset
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