Interface Function Codes - Keithley 6220 Reference Manual

Model 6220/6221 Reference Manual

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 con-
fused with programming commands found elsewhere in this manual. The interface
function codes for the Model 622x are listed in
Table C-7
Model 622x interface function codes
Code
SH1 Source Handshake capability
AH1 Acceptor Handshake capability
T5 Talker (basic talker, talk-only, serial poll, unaddressed to talk on
L4 LAG)
SR1 Listener (basic listener, unaddressed to listen on TAG)
RL1 Service Request capability
PP0 Remote/Local capability
DC1 No Parallel Poll capability
DT1 Device Clear capability
C0 Device Trigger capability
E1 No Controller capability
TE0 Open collector bus drivers
LE0 No Extended Talker capability
No Extended Listener capability
The codes define Model 622x 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-depen-
dent 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.
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Interface function
Return to Appendix topics
IEEE-488 Bus Overview
Table C-7.
C-15