Keithley 486 User Manual

APPENDIX B
Interface Function Codes
The interface function codes, which are part of the
IEEE-488 standards, define an instrument’s ability to
support various interface functions and should not be
confused with programmin% commands found else-
where in this manual. The interface function codes for the
Model 486/487 are listed in Table El. The codes define
Model 486/487 capabilities as follows:
SH (Source Handshake Function) - SHl defines the
ability of the instrument to initiate the transfer of me+
sage/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 or when it
is placed in talk-only.
L (Listener Function) -The abiity for the instrument to
receive device-dependent data over the bus from other
devices is provided by the L function. Listener capabili-
ties &A) of the instrument exist only after it has been ad-
dressed to listen.
SR (Service Request Function) -SRl defines the ability
of the instnunent to request service from the controller.
RL (Remote-Local Function) -RLl defines the ability of
the instrument to be placed in the remote or local modes.
PP (Parallel Poll Function) -The instrument does not
have pamllel polling capabilities W’O).
DC (Devtce Clear Function) - DC1 defines the ability of
the instrument to be cleared (initialized1.
DT (Device Trigger Function) -The Model 428 has no
device trigger capability @TO).
C (ControllerFunction)-The instrument does not have
controller capabilities (CO).
TE (Extended Talker Function) - The instrument does
not have extended talker capabilities (TEO).
LE Extended Listener Function) -The instrument does
not have extended listener capabilities CLEO).
E (Bus Driver Type) -The instrument has open-collec-
tar bus drivers (El).
Table B-l. Model 486/487 Interface Function
code
SHl
AH1
T5
SRl
Fi
DC1
DTl
co
El
TEO
LEO
Codes
Interface Function
Source Handshake capability
Acceptor Handshake capability.
Talker (basic talker, serial poll, talk-only,
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 capabilities
No Extended Listener capabilities
B-l

Keithley 486 Specifications

General

Brand	Keithley
Model	486
Category	Measuring Instruments
Language	English