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REMOTE
causes listening instruments to switch from local (front panel) control to remote pro¬
gram control. The HP-IB sequence:
REN
ATN
UNL
LAG
LOCAL
clears the REMOTE message and causes the listening instruments to return to local
control. The HP-IB sequence:
ATN
UNL
LAG
REN
GTL
LOCAL
prevents an instrument over-ride of remote control. The front panel [LOCAL] key is
LOCKOUT
inoperative, and only the controller (or a hard reset by the POWER switch) can restore
local control. The sequence:
REN
ATN
LLO
CLEAR
causes all instruments on the bus to be removed from local lockout and to return to
LOCKOUT/
local control. The HP-IB sequence:
LOCAL
REN
REQUIRE
(SRQ) can be sent by an instrument at any time to signify that attention is required from
SERVICE
the controller. The HP-IB sequence:
SRQ
The SRQ is held true until the instrument no longer needs service, or until a poll is
conducted to determine the nature of the SRQ.
STATUS
is an 8-bit byte of information from an addressed instrument, with each bit signifying
BYTE
the status of a specific instrument. The HP-IB sequence:
ATN
UNL
LAD
SPE
ATN
(data byte)
OR
LF
ATN
SPD
is a parallel poll of the bus instruments. The HP 8340B/41B does not respond to parallel
polling.
transfers active control of the bus from one controller to another. The HP-IB sequence:
ATN
UNL
TAD
TOT
terminates all bus transactions, and causes all instruments to listen for a command
from the controller. The HP-IB sequence:
IFC
REN
ATN
This completes the 12 HP-IB messages.
STATUS
BIT
PASS
CONTROL
ABORT
3-88
Operating Information
HP 8340B/41B
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