Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 362)

III. COMMAND REFERENCES - 15. Command References 15B. Driver488/SUB, W31, W95, & WNT
Personal488 User’s Manual, Rev. 3.0 III-347
SPollList
SYNTAX int pascal SPollList(DevHandlePT devHandles, unsigned char
*result, char untilflag);
devHandles is a pointer to a list of external devices.
result is an array that is filled in with the Serial Poll results of the corresponding
external devices.
untilflag refers to either ALL , WHILE_SRQ , or UNTIL_RSV .
RETURNS -1 if error
MODE *CA
BUS STATES ATN
•UNL, MLA, TAG, SPE, *ATN, ATN•SPD, UNT
SEE ALSO SPoll, PPoll
EXAMPLE deviceList[0] = wave;
deviceList[1] = timer;
deviceList[2] = dmm;
deviceList[3] = NODEVICE;
result = SPollList(deviceList,
resultList, ALL);
Return the Serial Poll response for a
list of device handles.
In Active Controller mode, the SPollList (Serial Poll) command performs a Serial Poll of the bus
devices specified and responds with a number from 0 to 255 (representing the decimal equivalent of
the eight-bit device response) for each device on the list. If rsv ( DIO7 , decimal value 64 ) is set, then
that device is signaling that it requires service. The meanings of the other bits are device-specific.
Serial Polls are normally performed in response to assertion of the Service Request ( SRQ ) bus signal by
some bus device. In Active Controller mode with the interface device specified, the SPollList
command returns the internal SRQ status for each device. If the internal SRQ status is set, it usually
indicates that the SRQ line is asserted. Driver488 then returns a 64 . If it is not set, indicating that SRQ
is not asserted, then Driver488 returns a 0 . With an external device specified, SPollList returns the
Serial Poll status of the specified external device.
In Peripheral mode, the SPollList command is issued only to the interface and returns the Serial Poll
status. If rsv ( DIO7 , decimal value 64 ) is set, then Driver488 has not been Serial Polled since the last
Request command was issued. The rsv is reset whenever Driver488 is Serial Polled by the
Controller.
The untilflag refers to either ALL , WHILE_SRQ , or UNTIL_RSV . If ALL is chosen, all the devices are
Serial Polled and their results placed into the result array. If untilflag is WHILE_SRQ , Driver488
Serial Polls the devices until the SRQ bus signal becomes unasserted, and the results are put into the
result array. If untilflag is UNTIL_RSV , Driver488 Serial Polls the devices until the first device
whose rsv bit is set, is found and the results are put into the result array.
Status
SYNTAX int pascal Status(DevHandleT devHandle, IeeeStatusT *result);
devHandle refers to either an IEEE 488 interface or an external device. If
devHandle refers to an external device, Status acts on the hardware
interface to which the external device is attached.
result is a pointer to a Status structure.
RETURNS -1 if error
MODE Any
BUS STATES None
SEE ALSO GetError, SPoll