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Model 5344S
Operation and Programming
SV STEMS
Table 3-12. HP-IB Messages
(Continued)
HP-SB
MESSAGE
DESCRIPTION/RESPONSE
SAMPLE HP 85A
Address=20
IEEE 488
USAGE
SERVICE
REQUEST
5344A will request service
service when OUT OF LOCK
condition exists, or when
END OF SWEEP has
been detected.
A=STATUS 7
IF BIT (A, 3)=1
Then SRQ is set
STATUS
BYTE
Presents status information.
STATUS 720
LAG, SPE, TAG,
(accept status
byte), LAG,
SPD
PASSS
CONTROL
Not applicable.
ABORT
Terminates all HP-IB activity
and returns control to the
system controller.
ABORTIO 7
IFC
3-150.
5344S Bus Message Response
a.
REMOTE:
The 5344A goes Remote when it receives the REMOTE message on the HP-IB.
All front panel controls except the RESET key are ignored. In REMOTE
operation, the 5344S is programmed by the controller via messages sent over
the bus. Until changed, the state of the 5344S remains as it was prior to re¬
ceipt of the REMOTE message. Any partially entered keyboard sequence
is aborted.
b.
LOCAL:
Returns the 5344S to front panel control. (HP-IB bus activity is ignored until
another REMOTE message is sent). Otherwise, the state of the 5344S re¬
mains as it was prior to receipt of the LOCAL message, except for LOOP
BANDWIDTH which defaults to Wide, and Subharmonic mode which
defaults to NORM.
Any partially entered HP-IB data message is aborted.
NOTE
The 5344A does not respond to any messages other than
REMOTE and serial polls (see STATUS BYTE) when in LOCAL
operation.
c. LOCAL
Disables the 5344A RESET key. The 5344A remains in remote operation until
LOCKOUT: a LOCAL or CLEAR LOCKOUT & LOCAL message is received on the bus.
The LOCAL LOCKOUT message can be used to maintain "absolute'1
programmatic control of the 5344S.
d.
GO TO
Returns the 5344S to front panel control following a LOCAL LOCKOUT
LOCAL
message. Otherwise, the state of the 5344S remains as it was prior to receipt
AND
of the CLEAR LOCKOUT & message. Any partially entered HP-IB data mes-
CLEAR
sage is aborted.
LOCAL
LOCKOUT:
e.
ABORT:
Terminates any HP-IB activity and returns control to the system controller.
The 5344A HP-IB interface is reset to the state entered when remote
operation is first enabled. 5344S parameters and lock state remain as they
were before the ABORT message. Any partially entered HP-IB data message
is aborted.
3-58
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