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3.11.4 GPIB Address DIP Switch
The GPIB Address of the Digibridge is set by the
SW2 DIP Switch. The numeric value is set by setting
the switch on or off for the corresponding bit with
the OFF position for binary 1 and ON position for
binary 0. Depress the rocker toward the OFF mark-
ing for OFF and toward the numeric marking for the
corresponding ON position.
SW2 DIP switch setting for selecting Digibridge
GPIB address:
Decimal
Address
S1
S2
0
ON
ON
1
OFF
ON
2
ON
OFF
3
OFF
OFF
4
ON
ON
5
OFF
ON
6
ON
OFF
7
OFF
OFF
8
ON
ON
9
OFF
ON
10
ON
OFF
11
OFF
OFF
12
ON
ON
13
OFF
ON
14
ON
OFF
15
OFF
OFF
16
ON
ON
17
OFF
ON
18
ON
OFF
19
OFF
OFF
20
ON
ON
21
OFF
ON
22
ON
OFF
23
OFF
OFF
24
ON
ON
25
OFF
ON
26
ON
OFF
27
OFF
OFF
28
ON
ON
29
OFF
ON
30
ON
OFF
31
Not Used
Table 3-17: Digibridge GPIB address
Operation
Switch Settings
S3
S4
S5
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
GPIB Address 31 is not a valid GPIB Address and
setting the SW2 DIP switch to this setting (all switches
in the OFF position) will disable the GPIB interface,
with all communication possible only via the RS 232
serial interface.
By convention, GPIB Address 0 is normally used by
the controller.
3.11.5 Jumpers
The Digibridge IEEE-488.2 interface board has three
jumpers, JP1, JP2, and JP3. For normal operation,
all three jumpers should be open (no shorting blocks
inserted).
JP1 enables the RS 232 interface driver auto power
off.
JP2 forces firmware update mode via RS 232 serial
interface. If JP2 is set, the board will be forced to
await firmware update and the Digibridge will be
held in reset state.
JP3 enables flash write protect. If JP3 is set, certain
onboard flash will be prevented from being updated.
Since multiple safeguards are in place to prevent
unintentional flash overwriting, the use of JP3 is not
needed.
All other headers, populated and non-populated, are
intended only for manufacturing test or future use.
Do insert connectors or shorting blocks into these
headers as the board may malfunction or permanent
damage may result.
3.11.6 RS-232 Serial Interface
(Currently Not Implemented)
The RS-232 Serial Interface implements a standard 9
wire DTE serial interface requiring the use of a stan-
dard 9-pin Female-to-Female Null Modem cable for
connection to a PC. In normal use, either the IEEE-
488 interface or the RS232 interface is used. Using
both interfaces at the same time is possible, but will
degrade overall communication speed and can lead
to communication conflicts.
1693 RLC Digibridge
73
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