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CHAPTER 2: INSPECTION, CONFIGURATION, & INSTALLATION
Finally, the Channel Select Jumper (TB3 and
TB4)
determines which ADC-16 input channel the STA-
EX8 will use for communication. You may have up to eight STA-EX8s connected to one ADC-16.
Each STA-EX8 must have its own ADC-16 input channel. For example,
if
your application requires
two STA-EX~S, one might be assigned to Channel 0, the other to Channel
1.
Figure
2-7
shows the
Channel Select Jumper configured for Channel
1.
INSTALLATION PROCEDURE
Obtain the required C-1800 cables, and connect STA-EX8b) to an ADC-16 as follows:
1.
Be
sure your computer is off.
2. Remove the top cover of the STA-EX8 (loosen the four corner screws and remove; then, lift the
cover).
3. Set the Channel Select Jumper for an available ADC-16 input channel.
4.
Plug one end of the C-1800 cable into the ADC-16's I/O Connector.
5 . Plug the other end of the C-1800 cable into the first 37-pin connector
(J1)
on STA-EX8
#1.
6. If you are connecting more than one STA-EX8, daisy-chain the first STA-EX8 to the second. Plug
one end of a second C-1800 cable into the second 37-pin connector (J2) of STA-EX8 #1. Then,
connect the C-1800 to J1 on STA-EX8 #2. Repeat this step for successive STA-EX8s. (Remember,
you cannot install more than eight STA-EX8s.I
7. Make all other STA-EX8 connections, as required by your application.
8. Replace the cover(s) on the STA-EX8(s).
INPUT CHANNEL ASSIGNMENTS
When programming the ADC-16 to accept the data presented on the channels added by the STA-EX8
multiplexer,
you
must understand the assignment of the input channels. First, the Channel Select
'jumper on each STA-EX8 determines which ADC-16 input channel (CHO, CHI, CH2, CH3, etc.) the
STA-EX8 will use for communication. The multiplexed channels (EXO, EX1, etc.) are then allocated
consecutively from the assigned ADC-16 channel. For example, if your application has two STA-EX~S,
you will assign the first STA-EX8 to ADC-16 Channel
CHO.
The multiplexed channels will then be
allocated as follows: EX0
=
Channel 0, EX1
=
Channel 1, EX2
=
Channel 2,
...
EX7
=
Channel 7. Then,
you will assign the second STA-EX8 to ADC-16 Channel CH1. The multiplexed channels of the
second STA-EX8 will then be EX0
=
Channel 8, EX1
=
Channel 9,
...
EX7
=
Channel 15. The remaining
ADC-16 input channels will then follow EX7
=
Channel 15; that is, CH2
=
Channel 16, CH3
=
Channel
17,
...
CH7
=
Channel 21. Be aware that the ADC-16 input channels run in parallel across the cable.
For example, the CH2 output is associated with channel 16 on both STA-EX8s. Figure 2-8 illustrates
this arrangement.
Note that the STA-EX8 multiplexed inputs are not usable by the Pop Up Control Panel.
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