Bank-To-Bank Jumpers; Digital I/O Connections; Voltage Source Jumper - Keithley 7021 Instruction Manual

Figure 4-2
Bank-to-bank jumper locations

Bank-to-bank jumpers

As explained in Section 2, the multiplex banks can be con-
nected together (using plug-in jumpers) to form large multi-
plexers. The locations of the bank-to-bank jumper terminals
for the connector card are shown in Figure 4-2.
On the illustration, the two terminal pairs are labeled J204
and J205. J204 is used to connect the HI terminals of the
banks. J205 is used to connect the LO terminals of the banks.
Referring to Figure 4-2 for jumper locations, perform the fol-
lowing steps to install or remove bank-to-bank jumpers:
1. If mated together, separate the relay card from the con-
nector card by removing the mounting screw and pull-
ing the two cards away from each other. Remember to
only handle the cards by the edges and shields to avoid
contamination.
2. Refer to Figure 4-2 to determine which jumpers to in-
stall or remove.
3. Using Figure 4-3 as a guide, install the jumpers on, or
remove the jumpers from, the appropriate terminal
pairs.
Figure 4-3
Bank-to-bank jumper installation
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Jumper
Jumper Terminal
Pair
Card Connections and Installation
J205
J204
J201

Digital I/O connections

Voltage source jumper

Digital output uses the internal +5V source as the high logic
level. If higher voltages are required, a user-supplied voltage
can be used (42V maximum). At the factory, the internal
jumper is set to use the internal +5V source.
CAUTION
Failure to set J201 to the V
when using external pull-up voltages
may result in damage to the output
drivers.
A plug-in jumper for the bank allows you to select the inter-
nal +5V source or an external source. In Figure 4-4, the
banks are using the external voltage source.
31
32
33
U203 U201
34
Figure 4-4
Voltage source jumper for output channels
position
ext
5V
J201
V
ext
35 39
36 40
37
U202
38
4-3