ICS ELECTRONICS 4809A, Instruction Manual

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AMP 554349-1
Metric Lockstuds
3M 3626
Figure 2-6 114439 Flat Ribbon Cable Assembly
2.8.1.2 GPIB/Address Switch Connector J2
Connector J2 is a 26-pin connector that contains the GPIB external address
switch signals as well as the GPIB bus signals. J2 is used when you want
to use an external GPIB address switch with the 4809A. The J2 connector
layout is shown in Figure 2-8 and the signal-pin assignments are listed in
Table 2-1. The external address switch inputs are low true signals with pullup
resistors on the 4809A. At power turn-on, the 4809A reads the five address
lines (ADSW1-ADSW5) if the external address switch is enabled.
Connector J2 mates with ICS’s GPIB Connector/Address Switch Assem-
blies. These assemblies are small business card size assemblies that mount
a GPIB connector and a 8-bit rocker switch to the rear panel of a chassis.
They have a 26 conductor, flat ribbon cable that plugs into J2 on the 4809A.
The assemblies are available in two layout styles. Refer to Appendix A3
for dimensions, installation instructions and silkscreen. Switch layout and
rocker functions are shown in Figure 2.7. Note that rockers 7 and 8 are
not used by the 4809A.
Switch set to address 4
On is up
Figure 2-7 Address Switch Rocker Assignments
1 2 3 4 5 6 7 8
ON
1 8 4 2 1 0 - -
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