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The third column of Table 3-l lists the mnemonics for the
command
sequences.
While most of these are covered
elsewhere, a few points should be noted. The ATN line is set
low by the controller if the data bus contains a multiline com-
mand. 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 opertion in some situations. The Model 706
will essentially ignore these commands (the Model 706 trig-
ger; on MTA in the TO and Tl modes), but other devices may
require that MLA and MTA be present in the command se-
quence under certain circumstances.
NOTE
The HP85 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
706 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 706. These codes are
also listed for convenience on the rear panel of the intrument
near the IEEE connector. The numeric value following
each
one or two letter code defines the Model 706 capabilities as
follows:
1. SH (Source Handshake Function)-The
ability for the
Model 706 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
706
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 706 to
send device-dependent
data over the bus (to other
devices) is provided by the T function.
Model 706 talker
capabilities exist only after it has been addressed to talk.
4. L (Listener Function)-The
ability for the Model 706 to
receive device-dependent
data over the bus (from other
devices) is provided by the L function.
Listener function
capabilities of the Model 706 exist only after it has been
addressed to listen.
5. SR (Service Request Function)-The
ability
for the
Model 706 to request service from the controller is pro-
vided by the SR function.
6. RL (Remote-Local Function)-The
ability for the Model
706 to be placed in the remote or local mode is provided
by the RL function.
7. PP (Parallel Poll Function)-The
Model 706 does not
have parallel polling capabilities.
8. DC (Device Clear Function)-The
ability for the Model
706 to be cleared (initialized) is provided by the DC func-
tion.
9. DT (Device Trigger Function)-The
ability for the Model
706 to have its basic operation is provided by the DT
function.
10. C (Controller Function)-The
Model 706 does not have
controller capabilities.
11. TE (Extended Talker Capabilities)-The
Model 706 does
not have extended talker capabilities.
Table 3-1. HP-85 IEEE-488 BASIC Statements
Statement
Action
Bus Command
Sequence
ABORT10 7
Send IFC.
IFC
CLEAR 7
Send DCL.
ATNaDCL
CLEAR
718
Send SDC to device 18.
ATN*UNL;MTA;LAG;SDC
ENTER 718;AS
Device 18 addressed to talk.
ATN@UNL;MLA;TAG;ATN;data
Data placed is A$.
LOCAL 7
Set REN False
Rim
LOCAL
718
LOCAL LOCKOUT 7
Send GTL to device 18.
ATN*UNL;MTA;LAG;GTL
Send LLO.
ATNeLL
OUTPUT 718;AS
Device 18 addressed to listen.
ATNeMTA;UNL;LAG;Ay;data
Transmit A$.
REMOTE 7
Set REN true.
REN
REMOTE 718
Set REN true. Address device
REN;ATN*UNL;MTA;LAG
18 to listen.
RESET 7
Send IFC, cancel REN.
IFC;REN;a
SPOLL (7181
Address device 18 to talk.
ATN.UNL;MLA;TAG;SPE;Am;
Conduct serial poll.
status byte;ATN*SPD;UNT
TRIGGER 7
Send GET without addressing.
ATNaGET
TRIGGER 718
Address device 18 to listen.
ATN.UNL;MTA;LAG;GET
Send GET.
3-2
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