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2-28. Let's look at the timing of the transition to the non-assertive state for these lines. DAV
may be driven high by the TALKERS after it recognizes that DAC is high. RFD may be set low as
soon
the LISTENER recognizes that DAV has been set low. The 5340A requires RFD to be set
as
low no later than 50 nsec after the LISTENER sets DAC high. When the 5340A is a listener it
drives RFD low at the same time it sets DAC high. The timing of DAC is similar to RFD, i.e., it
may go low as soon as DAV is high and it must be low no later than 50 nsec after RFD is driven
high.
The 50 nsec permits a controller, when working with only one 5340A on the bus, to
generate either DAC or RFD and invert it to get the other.
2-29. Addressing the 534044
2-30. Before a 5340A can send output data or accept program information it MUST be addressed
to TALK or LISTEN. The method used to address it depends on the rear panel switch marked
-
TALK ALWAYS
ADDRESSABLE (See Figure 2-2). When in the TALK ALWAYS position, the
to
TALK
and outputs each measurement. This position is intended for operation where there is no con-
troller, e.g., with a digital recorder. When the rear panel switch
Sent program information by a controller and the measured results are observed
a.
visually, or
Both program and output information are passed on the bus managed by a controller.
b.
2-31. Addresses are communicated on the data lines. When the controller sets ATN low, all
time, the signal levels on D106 and DI07, designate whether the addressed 5340A is to com-
municate as a TALKER or a LISTENER.
D
D
D
I
I
I
0
0
0
7
6
5
1
0
0
1
X
0
0
X
1
1
A,
Address switches on rear panel
-
X
Don't care
-
* -
The clear address characters
2-32. The thirty-one
(31)
are shown in Tables 2-2 and 2-3. A unique character is selected for each 5340A with the five (5)
slide switches on the rear panel marked ADDRESS (A5, A4, A3, A2, A1) (see Figure 2-2). These
switches may be set to ei4her
2-33. Two characters are yeserved for the special function of clearing or removing a 5340A from
the active state of an addredsed TALKER or LISTENER. The 534014 is cleared as a LISTENER
if it is sent an ASCII "?" dhile ATN is low. The 5340A is cleared as a TALKER if another instru-
ment is addressed to qALK or it is sent a n ASCII ''-"
cleared as either a TALKER or LISTENER when IFC is low.
-
it outputs ONLY. It operates according to the front panel controls
D
D
D
I
I
I
0
0
0
4
3
2
X
X
X
X
X
X
not allowed.
(11111)
possible LISTEN and TALK address characters and their signal levels
or 1 (0 represents a high level and 1 a low level).
0
Installation and Remote Programming
set to ADDRESSABLE, the
is
D
I
0
1
TALK ADDRESS*
-
LISTEN ADDRESS*
-
Ignored by 5340A
when
X
ATN
low
is
(underscore) while ATN is low.
Model 5340A
I
It
is
2-7
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Table of Contents
Troubleshooting
