Measurement Computing CIO-EXP16, Руководство пользователя

Страница: 15 / 27

CIO-EXP16 User's Guide Installing the CIO-EXP16
A/D board type
Use the 4-pin jumper labeled
A/D BOARD TYPE
to configure the CIO-EXP16 for use with the DAS08 family
of boards or the DAS16 family of boards. Place the jumper in the position for the type of A/D board you are
using with the CIO-EXP16. Fig
shows the jumper configured with its default setting of DAS08. ure 6
Figure 6. Board type select jumper
LLGND
P2, pin19
P2, pin 18
DAS16 DAS08
A/D Channel for EXP Output
Select a separate A/D channel for each CIO-EXP16 output that you plan to use. Each CIO-EXP16 has two
potential signals — the output of the 16 multiplexed inputs, and the output of the CJC circuit. The output of the
CIO-EXP16 selected channel is an input to the A/D board.
Two rows of 16 jumper pairs located near the 37-pin connectors are labeled with A/D board channel numbers
(see
). These channel numbers designate which of the A/D board's input channels will be connected to
the MUX board’s output(s). Each CIO-EXP16 output, if used, must be exclusively assigned to an A/D channel
using these jumpers. In other words, for all CIO-EXP16 boards attached to an A/D board, only one jumper on
any of the jumper blocks should be assigned to a particular channel.
Figure 7
Figure 7
Figure 7. EXP Channel Select and CJC Select jumper blocks
shows the layout of the jumper blocks on the CIO-EXP16.
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15
EXP OUTPUT TO DAS
CJC OUTPUT TO DAS
DAS8/16 DAS16 ONLY
These jumpers are for
boards with 16 channels
only, such as the CIO-DAS16
in 16 channel mode.
The CIO-EXP16 has 16 input channels multiplexed into one output. This output is connected to the jumper
block labeled
EXP OUTPUT TO DAS
. This jumper block determines which analog input channel of the A/D
board in the computer is connected to the output from the CIO-EXP16 board.
The CIO-EXP16 also has a semiconductor temperature sensor on board to measure the temperature of the board
in the region of the screw terminals. The temperature at the screw terminals is needed when thermocouples are
used with the CIO-EXP16. The temperature at the screw terminals is called the
Cold Junction temperature, and
is needed to accurately calculate thermocouple temperature. This is known as Cold Junction Compensation .
When a CIO-EXP16 channel is used with a thermocouple, install the CJC OUTPUT TO DAS jumper in the
desired channel location. If you are not using thermocouples, do not install it.
ƒ
Select the A/D board channel to connect the multiplexed analog output to using the jumpers labeled
EXP
OUTPUT TO DAS .
Channels 0-15 are connected by default to A/D board channel 0.
ƒ
Select the A/D board channel to connect the CJC output to (if required) using the jumpers labeled
CJC
OUTPUT TO DAS
.
CIO-EXP CJC is connected by default to A/D channel 7.
15