Keithley 6220, Reference Manual

Page: 428 / 454

Model 6220/6221 Reference Manual IEEE-488 Bus Overview C-15
Return to Appendix topics
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 .
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.
Table C-7
Model 622x interface function codes
Code Interface function
SH1
AH1
T5
L4
SR1
RL1
PP0
DC1
DT1
C0
E1
TE0
LE0 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
Test Equipment Depot - 800.517.8431 - 99 Washington Street Melrose, MA 02176 - TestEquipmentDepot.com