Measurement Computing Personal488 rev.3.0 For DOS & Windows 3.Xi - Manual (Page 361)

15B. Driver488/SUB, W31, W95, & WNT III. COMMAND REFERENCES - 15. Command References
III-346 Personal488 User’s Manual, Rev. 3.0
SEE ALSO SendCmd, SendEoi
EXAMPLES char data[] = “W0X”;
errorcode = SendData(ieee, data, strlen (data));
The SendData command provides byte-by-byte control of data transfers and gives greater flexibility
than the other commands. This command can specify exactly which operations Driver488 executes.
SendEoi
SYNTAX int pascal SendEoi(DevHandleT devHandle, unsigned char *data,
int len);
devHandle refers to an interface handle.
data points to a string of data bytes to be sent.
len is the length of the data string.
RESPONSE None
MODE Any
BUS STATES User-defined
SEE ALSO SendCmd, SendData
EXAMPLES char data[] = “W0X”;
errorcode = SendEoi(ieee, data, strlen (data));
The SendEoi command provides byte-by-byte control of data transfers and gives greater flexibility
than the other commands. This command can specify exactly which operations Driver488 executes.
Driver488 asserts
EOI during the transfer of the final byte.
SPoll
SYNTAX int pascal SPoll(DevHandleT devHandle);
devHandle refers to either an interface or a specific external device.
RETURNS -1 if error;
otherwise, 0 or 64 (hardware interface) in the range 0 to 255
(external device)
MODE Any
BUS STATES ATN
•UNL, MLA, TAG, SPE, *ATN, ATN•SPD, UNT
SEE ALSO SPollList, PPoll
EXAMPLES errorcode = SPoll(ieee); Return the internal SRQ status
errorcode = SPoll(dmm); Return the Serial Poll response of the
specified device
In Active Controller mode, the SPoll (Serial Poll) command performs a Serial Poll of the bus device
specified and responds with a number from 0 to 255 representing the decimal equivalent of the eight-
bit device response. 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 SPoll command
returns the internal SRQ status. 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, SPoll returns the Serial Poll status of the
specified external device.
In Peripheral mode, the SPoll 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
issuing last Request command. The rsv is reset whenever Driver488 is Serial Polled by the
Controller.