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5-5
5.5
Front panel aspects of IEEE-488
operation
The following paragraphs discuss aspects of the front panel
that are part of IEEE-488 operation, including messages, sta-
tus indicators, and the LOCAL key.
5.5.1 Error and status messages
Table 4-1 in Section 4 summarizes the error and status mes-
sages associated Model 7001 operation. Note that the instru-
ment may be programmed to generate an SRQ, and
command queries can be performed to check for specific er-
ror conditions.
5.5.2 IEEE-488 status indicators
The REM (remote), TALK (talk), LSTN (listen), and SRQ
(service request) annunciators show the present IEEE-488
status of the instrument. Each of these indicators is briefly
described below.
REM
As the name implies, this indicator shows when the
instrument is in the remote state. Note that REM does not
necessarily indicate the state of the REM line, as the instru-
ment must be addressed to listen with REM true before the
REM indicator turns on. When the instrument is in remote,
all front panel keys except for the LOCAL key are locked
out. When REM is turned off, the instrument is in the local
state, and front panel operation is restored.
TALK
This indicator is on when the instrument is in the
talker active state. The unit is placed in this state by address-
ing it to talk with the correct MTA (My Talk Address) com-
mand. TALK is off when the unit is in the talker idle state.
The instrument is placed in the talker idle state by sending it
an UNT (Untalk) command, addressing it to listen, or with
the IFC (Interface Clear) command.
LSTN
This indicator is on when the Model 7001 is in the
listener active state, which is activated by addressing the in-
strument to listen with the correct MLA (My Listen Address)
command. Listen is off when the unit is in the listener idle
state. The unit can be placed in the listener idle state by send-
ing UNL (Unlisten), addressing it to talk, or by sending IFC
(Interface Clear) over the bus.
SRQ
The instrument can be programmed to generate a
service request (SRQ) when one or more errors or conditions
occur. When this indicator is on, a service request has been
generated. This indicator will stay on until the serial poll byte
is read. See paragraph 5.6.8 for details.
5.5.3 LOCAL key
The LOCAL key cancels the remote state and restores local
operation of the instrument.
Since all front panel keys except LOCAL are locked out
when the instrument is in remote, this key provides a conve-
nient method of restoring front panel operation. Pressing
LOCAL also turns off the REM indicator, and returns the
display to normal if a user defined message was displayed.
Note that the LOCAL key is also inoperative if the LLO (Lo-
cal Lockout) command is in effect.
5.6
Status structure
The status register structure of the Model 7001 is shown in
Figure 5-5. The following information will explain the vari-
ous registers and queues that make up this structure.
Table 5-2
HP BASIC 4.0 IEEE-488 statements
Action
BASIC statement
Transmit string to device 07.
Obtain string from device 07.
Send GTL to device 07.
Send SDC to device 07.
Send DCL to all devices.
Send remote enable.
Cancel remote enable.
Serial poll device 07.
Send local lockout.
Send GET to device 07.
Send IFC.
OUTPUT 707;A$
ENTER 707;A$
LOCAL 707
CLEAR 707
CLEAR 7
REMOTE 7
LOCAL 7
SPOLL (707)
LOCAL LOCKOUT 7
TRIGGER 707
ABORT 7
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