Appendix F: PlusBus Installation
ARC Plus Version 3 Instruction Manual
112
Connecting Command Channels
Command Channel Connector Pinouts
The ICRU connects 8 raise and 8 lower channels using two identical 24-pin connector blocks. Raise
channels connect to the left set of 24 pins on the rear panel, and lower channels connect to the right set
of 24 pins, so shown below:
Close-up of Form C contacts on the ICRU rear panel.
Each channel has three pins: a pin for common (left), and pins for the normally open or normally closed
contact. Pinouts for raise channels 1-8 and lower channels 1-8 are identified on the chart below.
Channels 9-16, 17-24, etc. connect in the same fashion on subsequent ICRUs.
1
2
3
4
5
6
7
8
C NO NC
C NO NC
C NO NC
C NO NC
C NO NC
C NO NC
C NO NC
C NO NC
ICRU rear panel pinouts. Pinouts for raise channels (left side of ICRU rear panel) are identical to the pinouts for lower
channels (right side of ICRU rear panel).
Labeling Command Channels
The accessory kit supplied with the ICRU includes labels to identify each command channel. To align and
affix the labels:
1.
Start by designating one of the 24-pin connector blocks for raise channels 1-8.
2.
Orient the connector block with the set screws facing toward you and below the wiring
terminals.
3.
Peel off the label identifying channels 1-8 and align the label on top of the connector block so
that the “CH 1” segment of the label corresponds with the first three pins on the left side of the
connector block. “CH 2” corresponds with the next set of three pins, and so on.
When the label
is aligned correctly, the three pins on the far right of the connector block are identified as “CH 8”
and there will be a small amount of overhang on each side of the label.
4.
Wrap the overhang around the side of the connector.
5.
Next, label the second connector block for lower channels 1-8. On subsequent ICRUs, apply
labels for channels 9-16, 17-24, etc. in the same way.
Note: If you wish, you can apply the label directly on the rear panel of the ICRU instead of on the
connector block.
Wiring Command Channels
Once you have labeled the connector blocks for your command channels, attach wiring for each channel
to the connector block using the connector labels as a guide. Secure the wiring using the built-in set
screws before attaching the connector block to the appropriate rear panel connector.