Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 332)

III. COMMAND REFERENCES - 15. Command References 15B. Driver488/SUB, W31, W95, & WNT
Personal488 User’s 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