Keithley 2001 Operator's Manual page 187

S=SPOLL (716)
PRINT "SPOLL BYTE =";S
After the first statement, the controller conducts the serial
polling sequence. After the second statement is executed, the
decimal value of the serial poll byte is displayed on the con-
troller CRT.
2001-900-01 Rev. K/ August 2010
IEEE-488 Reference
4-29