HP 3336B - Page 61

Appendix A
To make the -hp- 3336 return specific information about its operating state:
First:
BUS MANAGEMENT LINES
ATN IFC SRQ REN EOI one aa is on Data lines
T F X T Xx ? U_ $
L_ 3336 listen address
controller talk address
universal unlisten (077g)
Second:
BUS MANAGEMENT LINES
ATN
IFC
SRQ
REN
EOI
sequence
on
Data
lines
F F Xx T Xx interrogate Program Instruction
Third:
BUS MANAGEMENT LINES
ATN
IFC
SRQ
REN
EOI
co
on
Data
lines
T F Xx T x ? OD 5
ae address of device
receiving data
-hp- 3336 talk address
universal unlisten (0778)
Fourth:
BUS MANAGEMENT LINES
ATN
IFC
SRQ
REN
EOI
sequence
on
Data
lines
F
F
x
T
F*
The
-hp-
3336
will
return
the
interrogated
information
now
*Bus
Management
Line
‘‘EOI"’
will
be
true
concurrent
with
the
last
character
of
a
multi-byte
message.
The
sending
device
sets
this
line.
Figure 3-A-7. Data (receive).