Measurement Computing CIO-EXP-GP - Manual (Page 7)

There are three groups of 16-position jumpers. One jumper group determines the signal output channel,
one jumper group determines the excitation voltage output channel and one determines the Cold Junction
Compensation (CJC) output channel. Signal output is always used, CJC output is used only with
thermocouples and excitation output may be used with bridge sensors.
There are 16 jumper locations for each function. Each corresponds to one of the 16 pins on the 37 pin
connector. When the CIO-EXP-GP is connected to a DAS08, only the first 8 channels (labeled 0-7) can
be used. When the CIO-EXP-GP is connected to a DAS16, all 16 jumper positions can be used. In each
case, the jumper corresponds to a channel number on the A/D board.
If the jumper setting does not agree with the selection made in InstaCal setup, InstaCal and the Universal
Library will not be able to make readings from the CIO-EXP-GP. Figure 3-3 is a diagram of the Channel
Select jumper. There are two other groups of output jumpers similar to this group.
1 2 3 4 5 6 7 8 9 10 11 12 14 15 0 13
CH SEL
CHANNEL 0 SELECTED
FOR SENSOR OUTPUT
The top group (shown here) is marked CH SEL
(Channel Select), the center jumper group is
VEXC SEL (excitation voltage select) and the
bottom group is marked CJC SEL (Cold Junction
Compensation Select).
Figure 3-3. Output Channel Select Jumper
Place the jumper on the pin which corresponds to the A/D board's input channel. Each jumper set must
select a unique A/D channel. For example, if you are using the excitation or CJC outputs in addition to
the signal output, each should be set to a different channel number.
One individual channel must be selected for each bank of 8 EXP channels. For example, if you are using
several CIO-EXP-GP boards, the jumper setting for each board must be unique. If you select channel 0
for the first board, do not use this channel for any of the other boards.
3.3 Configuring the A/D Board
3.3.1 DAS08 Family Setup
The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Some of the boards in the DAS08 series have differential inputs that can be converted to single-ended
inputs. See the information shipped with your A/D board for conversion to single-ended inputs.
3.3.2 DAS16 Family Setup
The input mode of the A/D board must be single-ended to be compatible with the CIO-EXP outputs.
Most of the DAS16 series is switch selectable for either 8 differential or 16 single ended inputs. When
used with the CIO-EXP, set the switch to 16 channel, single-ended mode.
3.3.3 All A/D Boards
If you are using an A/D board with switch - selectable ranges, consider the application and determine the
best fit for range vs. expected voltage. For example, when measuring resistance such that the output of
the EXP board is expected to be in the range of 3 to 4.5 Volts, a unipolar 5V range would be the best
choice.
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