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Model 4277A
SECTION III
When bit switch 7 is set to 0, the instrument is in
ADDRESSABLE mode and bit switches 1 through
5 determine the instrument address.
When this
bit switch is set to 1, however, the instrument is
in TALK ONLY mode.
Bit
switch
6
determines
the
output
data
delimiter. When this bit switch is set to 0, the
delimiter is a comma (,); when set to 1, the
delimiter is a carriage return and line feed
(CR/LF).
Note
The HP"IB Control Switch, as set at the
factory, is shown in Figure 3-24.
Note
The HP"IB Control Switch setting is
memorized only at instrument turn on.
Thus, even if the HP-IB Control Switch
setting is changed while the instrument
is turned on, the memorized setting is
not changed until the
instrument is
turned off and on.
3-88.
ADDRESSABLE MODE
3-89.
When bit switch 7 of the HP-IB Control
Switch is set to ADDRESSABLE (i.e., set to 0),
bit switches 1 through 5 represent the HP-IB
address of the instrument,
in binary.
These
switches are set to 10001 (decimal 17) when the
instrument leaves the factory but can be set to
any desired address between 0 and 30.
Note
When the instrument is turned on, the
HP-IB address is displayed, in decimal,
on
DISPLAY
A.
For
example,
the
factory-set address (10001) is displayed
as "17."
Note
HP-IB
address
11111
(decimal
31)
cannot be used. If this address is set,
El 9 will be displayed on DISPLAY A
(after 31 has been displayed) when the
instrument is turned on.
3-90.
TALK ONLY MODE
3-91.
When bit switch 7 of the HP-IB Control
Switch is set to TALK ONLY (i.e., set to 1), the
instrument functions as a "talker," outputting
data to a "listener" (e.g., printer).
In TALK
ONLY mode, bit switches 1, 2, and 3 determine
the format in which data is output. There are
six formats, FI through F6, and the bit switch
setting for each format is shown in Table 3-12.
Refer to paragraph 3-98 for details on the output
data formats.
Note
If the instrument is set to TALK ONLY
mode, the Output Data Format number
will be briefly displayed on DISPLAY A
(instead of the HP-IB address) when the
instrument is turned on. The displayed
number, however, will be the format
number plus 50.
For example, if the
Output Data Format is F3, the number
displayed on DISPLAY A at turn on will
be 53.
Note
When the instrument is used in TALK
ONLY mode, devices connected to the
instrument
must
be set
to
LISTEN
ONLY mode.
Table 3-12.
Output
Data
Formats
Selectable
in
TALK
ONLY
Mode
Bit Switch Settings
Output Data Format
Bit 3
Bit 2
Bit I
0
0
0
FI
0
0
1
F2
0
I
0
F3
0
1
1
F4
1
0
0
F5
1
0
1
F6
1
1
0
Fi
1
1
1
F2
Note:
Refer to paragraph 3-98 for details.
3-92.
REMOTE PROGRAM CODES
3-93.
Remoe program codes for the 4277A are
listed in Table 3-13.
3-55
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