Bus Messages - HP 5344S Operating Instructions Manual

Model 5344S
Operation and Programming
Table 3-11. HP-IB Interface Functions
Interface Function
Subset Identifier
Interface Function Description
SHI
Complete Source Handshake Capability
AH1
Complete Acceptor Handshake Capability
T2
Talker (Basic Talker, Serial Poll, No Talk Only, Doesn't Unaddress If MLA)
L2
Listener (Basic Listener, No Listen Only, Doesn't Unaddress If MLA)
SRI
Complete Service Request Capability
RL1
Complete Remote/Local Capability
PPO
No Parallel Poll Capability
DC1
Complete Device Clear Capability
DTI
Complete Device Trigger Capability
CO
No System Controller Capability
El
Open Collector Drivers
3-148. Bus Messages
3-149. Through bus messages, devices on the bus can exchange control and measurement
information. There are 12 basic messages which can be sent over the interface.
Table 3-12
lists
each bus message, giving a condensed description of the 5344S's response, and examples of
various controller's implementation of these messages. Paragraph 3-150 providesa more detailed
description of these messages.
Table 3-12. HP-IB Messages
HP-IB
MESSAGE
DESCRIPTION/RESPONSE
SAMPLE HP 85A
Address-20
IEEE 488
USAGE
DATA
Method for sending com¬
mands to the 5344A and
receiving measurement data.
OUTPUT 720; "CW2GZLK1"
ENTER 720;A
TRIGGER
Used in LOCK/ROLL mode
to initiate a sweep. Used in
TRIGGER 7
GET
CF/AF and START/STOP to
initiate a locked sweep.
TRIGGER 720
LAG, GET
CLEAR
Aborts any partially entered
CLEAR 7
DCL
HP-IB data message.
CLEAR 720
LAG, SDC
REMOTE
5344S goes remote. All front
panel controls are disabled
REMOTE 7
REN
(except RESET). All functions
and modes remain the same
as local unless changed
by a DATA message.
REMOTE 720
REN, LAG
LOCAL Returns 5344A to front
panel control.
LOCAL 720
LAG, GTL
LOCAL
LOCKOUT
Disables front panel reset
key; only controller can
return 5344A to local
operation.
LOCAL LOCKOUT 7
LLO
GO TO
LOCAL
AND CLEAR
LOCAL
LOCKOUT
5344A returns to local
operation. Local Lockout
is cleared.
LOCAL 7
REN
3-57