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This is indicated
in the table by ANDing
the ATN mnemonic
with the first command
on the bus. For example,
ATN*GET
means that ATN and GET are sent simultaneously.
Two commands
not previously
covered
are MLA
(My Listen
Address)
and MTA
(My Talk Address).
These
are ordinary
PCG (Primary Command
Group) addresses sent by the HP-85
to facilitate
bus operation
in some situations.
The Model 705
will essentially
ignore these commands
(the Model 705 triggers
on MTA in the TO and Tl modes),
but other devices may re-
quire
that
MLA
and
MTA
be
present
in the
command
sequence
under certain circumstances.
NOTE
The HP-85 address
is set to 21 at the factory.
Since each device on the bus must have a unique
primary address, do not set the Model 705 to the
controller's
address to avoid
possible conflicts.
3.1.3 Interface
Function
Codes
The interface
function
codes are part of the IEEE-488-1978
standards.
These codes define an instrument's
ability to sup-
port various functions
and should
not be confused
with pro-
gramming
commands
found
elsewhere
in this manual.
Table 3-2 lists the codes for the Model 705. These codes are
also listed for convenience
on the rear panel of the instrument
immediately
above
the IEEE connector.
The numeric
value
following
each one or two
letter
code
defines
Model
705
capabilities
as follows:
1. SH (Source
Handshake
Function)-The
ability
for the
Model 705 to initiate the transfer
of message/data
on the
data bus is provided
by the SH function.
2. AH (Acceptor
Handshake
Function)-The
ability
for the
Model
705 to guarantee
proper
reception
of message/
data on the data bus is provided
by the AH function.
3. T (Talker Function)
-The
ability for the Model 705 to send
device-dependent
data over the bus (to other devices)
is
provided
by the T function.
Model
705 talker capabilities
exist only after it has been addressed
to talk.
4. L (Listener
Function)-The
ability
for the Model
705 to
receive
device-dependent
data over the bus (from
other
devices)
is provided
by the L function.
Listener function
capabilities
of the Model
705 exist only after it has been
addressed
to listen.
5. SR (Service Request
Function)-The
ability for the Model
705 to request service from the controller
is provided
by
the SR function.
6. RL (Remote-Local
Function)-The
ability
for the Model
705 to be placed in the remote or local modes is provided
by the RL function.
7. PP (Parallel Poll Function)-The
Model 705 does not have
parallel polling capabilities.
8. DC (Device Clear Function)-The
ability for the Model 705
to be cleared (initialized)
is provided
by the DC function,
9. DT (Device
Trigger
Function)-The
ability for the Model
705 to have its basic operation
is provided
by the DT func-
tion.
10. C (Controller
Function)-The
Model
705 does not have
controller
capabilities,
11. TE (Extended
Talker
Capabilities)-The
Model
705 does
not have extended
talker capabilities.
12. LE (Extended
Listener
Capabiltiesl-The
Model 705 does
not have extended
listener capabilties.
Table
3-l.
HP-85
IEEE-488
BASIC
Statements
Statement
Action
Bus Command
Sequence
ABORT10
7
Send
IFC.
IFC
CLEAR 7
Send
DCL.
ATN*DCL
CLEAR 717
Send
SDC to device
17.
ATN*UNL;MTA;LAG;SDC
ENTER 717;AS
Device
17 addressed
to talk.
ATNaUNL;MLA;TAG;ATN;data
Data placed
in A$.
LOCAL 7
Set REN False
REN
LOCAL 717
Send
GTL to device
17.
ATN*UNL;MTA;LAG;GTL
LOCAL
LOCKOUT
7
Send
LLO.
ATN*LLO
OUTPUT
717;AS
Device
17 addressed
to listen.
ATN*MTA;UNL;LAG;ATN;data
Transmit
AS.
REMOTE 7
Set REN true.
REN
REMOTE 717
Set REN true. Address
device
REN;ATN.UNL;MTA;LAG
17 to listen.
RESET 7
Send
IFC, cancel
REN.
IFC;REN;REN
SPOLL(717)
Address
device
17 to talk.
ATN*UNL;MLA;TAG;SPE;ATN;
Conduct
serial poll.
status
byte;ATN*SPD;UNT
TRIGGER
7
Send GET without
addressing.
ATN*GET
TRIGGER
717
Address
device
17 to listen.
ATN*UNL;MTA;LAG:GET
Send GET.
3-2
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