3.8.3 Interface Function Codes
The interface functions codes, which are part of the
IEEE-488-1978 standards, define an instrument’s ability to
support various interface functions and should not be confus-
ed with programming commands found elsewhere in this
manual. The interface function codes for the Model 637 are
listed in Table 3-7. These codes are also listed for convenience
on the rear panel adjacent to the IEEE-488 connector. The
codes define Model 617 capabilities as follows:
SH (Source Handshake Function)-SH1 defines the ability of
the Model 617 to initiate the transfer of message/data over
the data bus.
AH (Acceptor Handshake Function)-AH1 defines the ability
of the Model 617 to guarantee proper reception of
message/data transmitted over the data bus.
T (Talker Function)-The ability of the Model 617 to send
data over the bus to other devices is provided by the T func-
tion. Model 617 talker capabilities exist only after the instru-
ment has been addressed to talk, or when it has been placed in
the talk-only mode.
L (Listener Function&The ability for the Model 617 to
receive devicedependent data over the bus from other
devices is provided by the L function. Listener capabilities of
the Model 617 exist only after the instrument has been ad-
dressed to listen.
SR (Service Request Function)-The SR function defines the
ability of the Model 617 to request service from the con-
troller.
RL (Remote-Local Function)-The RL function defines the
ability of the Model 617 to be placed in the remote or local
modes.
PI’ (Parallel Poll Function)-The Model 617 does not have
parallel polling capabilities.
DC (Device Clear Function)-The DC function defines the
ability of the Model 617 to be cleared (initialized).
DT (Device Trigger Function)-The ability for the Model 617
to have its readings triggered is provided by theDT function.
C (Controller Function)-The Model 617 does not have con-
troller capabilities.
TE (Extended Talker Function)-The Model 617 does not
have extended talker capabilities.
LE (Extended Listener Function&The Model 617 does not
have extended listener capabilities.
E (Bus Driver Type)-The Model 617 has open-collector bus
drivers.
Table 3-7. Model 617 interface Function Codes
Code Interface Function
Stil Source Handshake Capability
AH1 Acceptor Handshake Capability
T5
Talker (Basic Talker, Serial Poll, Talk Only
Mode, Unaddressed To Talk On LAG)
L4
Listener (Basic Listener, Unaddressed To Listen
On TAG)
SRl Service Request Capability
RLl Remote/Local Capability
PPO No Parallel Poll Capability
DC1 Device Clear Capability
DTl Device Trigger Capability
co No Controller Capability
El
Open Collector Bus Drivers
TEO No Extended Talker Capabilities
LEO No Extended Listener Capabilities
3.8.4 IEEE Command Groups
Command groups supported by the Model 617 are listed in
Table 3-8. Device dependent commands, which are covered
in paragraph 3.10, are not included in this list.
3.9 GENERAL BUS COMMAND
PROGRAMMING
General bus commands are those commands such as DCL
that have the same general meaning regardless of the instru-
ment type. Commands supported by the Model 617 are listed
in Table 3-9. which also lists both HP-85 and Model 8573
statements necessary to send each command. Note that com-
mands requiring that a primary address be specified assume
that the Model 617 primary address is set to 27 (its default ad-
dress). If you are using Model 8573 programming examples,
remember that the modified declaration file must be loaded
and run first, as described in paragraph 3.8.2.
3-12
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