Interface Function Codes - Keithley 2750 User Manual

G-14 IEEE-488 Bus Overview

Interface function codes

The interface function codes, which are part of the IEEE-488 standards, define an instru-
ment's ability to support various interface functions and should not be confused with pro-
gramming commands found elsewhere in this manual. The interface function codes for the
Model 2750 are listed in
Table G-6
Model 2750 interface function codes
Code
SH1
AH1
T5
L4
SR1
RL1
PP0
DC1
DT1
C0
E1
TE0
LE0
The codes define Model 2750 capabilities as follows:
SH (Source Handshake Function) — SH1 defines the ability of the instrument to initiate
the transfer of message/data over the data bus.
AH (Acceptor Handshake Function) — AH1 defines the ability of the instrument to
guarantee proper reception of message/data transmitted over the data bus.
T (Talker Function) — The ability of the instrument to send data over the bus to other
devices is provided by the T function. Instrument talker capabilities (T5) exist only after
the instrument has been addressed to talk.
L (Listener Function) — The ability for the instrument to receive device-dependent data
over the bus from other devices is provided by the L function. Listener capabilities (L4) of
the instrument exist only after it has been addressed to listen.
SR (Service Request Function) — SR1 defines the ability of the instrument to request
service from the controller.
RL (Remote-Local Function) — RL1 defines the ability of the instrument to be placed in
the remote or local modes.
Table G-6.
Source Handshake capability.
Acceptor Handshake capability.
Talker (basic talker, talk-only, serial poll, unaddressed to talk on LAG).
Listener (basic listener, unaddressed to listen on TAG).
Service Request capability.
Remote/Local capability.
No Parallel Poll capability.
Device Clear capability.
Device Trigger capability.
No Controller capability.
Open collector bus drivers.
No Extended Talker capability.
No Extended Listener capability.
Model 2750 Multimeter/Switch System User's Manual
Interface function