Keithley 199 Instruction Manual page 70

IEEE-488 PROGRAMMING
Note that the IDDCO error message is briefly displayed
when the second statement above is executed.
Trigger Overrun Error
A trigger overrun error occurs when the instrument
receives a trigger while still processing a reading from a
previous trigger. Note that any overrun triggers ar$ ig-
nored. These overrun hi ers will not affect the instru-
ment except to generate t e message below. When a tri l?
-
8l er overrun occurs, the following front panel message w
i!i e dIsplayed for approximately one second:
TRIGGER OVERRUN
Programming Example-To demonstrate a trigger
overrun error, enter the following statements into the com-
puter keyboard:
RE,+jTE 72%
Note that the trigger overrun message is displayed after
the third statement is executed.
Big String Error
to display a message
10 characters. Blank
e count as characters. Tl?e
the following message 1s
error occurs:
BIG STRING
"r
'ng Example-Enter the following statements in-
to t e computer to demonstrate a big strmg error:
The big string error will occu because the message is made
up-of I2 characters.
Cal Locked Error
A 01 locked error occurs when trying to calibrate the in-
strument over the bus with the front panel calibration
switch in the disable osition. Calibration commands will
be i nored
K
and the ollowmg message will Abe displayed P
brie y:
CAL LOCKED
Interval Overrun Error
A interval overrun error occurs when the instrument can-
not store readin
s
ai
in the data store ore scan at the pro-
gr.ammed interv
(Q command). However, the instrument
will continue to store readings as fast as it can nm. The
following message is displayed briefly when a short time
error occurs:
INTERVAL OVERRUN
Programming Etim le-To demon&ate an interval over-
R run error, enter t e following statements into the
computer:
The instrument will stati &&ring readings in the blffer.
However, since the instrument cannot make measurements
at the selected interval (Ismsec), interval overrun
errors
will occur.
3.7.2 IEEE-488 REM~QTE lndiczator and LOCAL
Key
REMOTE-The REM indicator shows when the instrument
is in the remote mode. Note that REM does not necessarily
indicate the state of the REN line, as the instrument must
be addressed to listen, with REN true before the REM in-
dicator will turn on. When the instrument is in remote,
all front panel keys except for the LOCAL key will be lock-
ed out. When REM is turned off, the instrument is in the
local mode.
LOCAL-The LOCAL key cancels the remote mode and
restores @al operation of the instrument.
Since all front panel keys except LOCAL are locked out
when the instrument is in remote, thii key provides a con-
venient method of restoring front panel operation. Press-
ing LOCAL will also turn off the REM indicator and return
the display to the normal mode if user messages were
previously displayed with the D command.
Note that the LOCAL key will also be inoperative if the
LLO (Local Lockout) command is in effect.
3-9