B Interface Function Codes - Keithley 6517A User Manual

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 pro-
gramming commands found elsewhere in this manual. The
interface function codes for the Model 6517A are listed in
Table B-1. The codes define Model 6517A capabilities as
follows:
Table B-1
Model 6517A interface function codes
Code Interface function
SH1 Source Handshake capability
AH1 Acceptor Handshake capability
T5 Talker (basic talker, talk-only, serial poll,
unaddressed to talk on LAG)
L4 Listener (basic listener, unaddressed to listen
on TAG)
SR1 Service Request capability
RL1 Remote/Local capability
PP0 No Parallel Poll capability
DC1 Device Clear capability
DT1 Device Trigger capability
C0 No Controller capability
E1 Open collector bus drivers
TE0 No Extended Talker capability
LE0 No Extended Listener capability
SH (Source Handshake Function) — SH1 defines the abil-
ity 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.
Interface Function Codes
T (Talker Function) — The ability of the instrument to send
data over the bus to other devices is provided by the T func-
tion. 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 devic-
es 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.
PP (Parallel Poll Function) — The instrument does not
have parallel polling capabilities (PP0).
DC (Device Clear Function) — DC1 defines the ability of
the instrument to be cleared (initialized).
DT (Device Trigger Function) — DTI defines the ability of
the Model 6517 to have readings triggered.
C (Controller Function) — The instrument does not have
controller capabilities (C0).
TE (Extended Talker Function) — The instrument does
not have extended talker capabilities (TE0).
LE (Extended Listener Function) — The instrument does
not have extended listener capabilities (LE0).
E (Bus Driver Type) — The instrument has open-collector
bus drivers (E1).
B
B-1