Keithley 486 Instruction Manual page 122

SECTION 4
IEEE-488 Reference
If the first bit of the word is set, the voltage source is now (or was previously) in current limit
(Up.4 or 2.5n-A). If the second bit of the word is set, the enabled interlock circuit is now (or was
previously) open Le. lid of test fkture open).
Any set bits in this word will remain set until the U9 word is read by the controller. Of course, if
theerror(s)stillexists, thebit(s)willnotdear.Notethatifany oneof the two bitsintheU9status
word becomes set, the voltage source errorbit in the serial poll byte Error Status Word becomes
set. The voltage source error bit in the serial poll byte word will not clear until all bits in the U9
word clear.
Note: Sending the LJ9 command to the Model 4% will result in an IDDCO error.
Programming
The following program will obtain and display (on the computer CRT) the machine status
Examples
word (LJO):
10 REMOTE722
20 DEviA$[601
30 OUTPUT 722; 'TJOX"
40 ENTER722;A$
50 PRlNTA$
6oFND
! Send UO command.
! Program 486/487
to
talk
! Display UO status word.
4-37