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RC4000 ACU Boardset
OPTIONAL MULTI-FEED OPERATION
When multiple, swappable feeds exist in a system, the multi-feed capability allows the ACU to detect and
configure itself according to the currently attached feed. The multi-feed ("pol-id") scheme allows for
unique properties, polarization movement, position indication, and even locate signal source. A maximum
of 8 different configurations are possible. Some systems may be restricted to less than 8.
The multi-feed system is very flexible. All configuration screens that are related to polarization are
expanded to allow for scrolling through each available feed index. This operation is similar to the location
presets and satellite presets screens. The polarization configuration screen is modified as follows:
POL#:0
CCW: -90.0
<SCR> THRU LIST, <ENTER> TO MODIFY DATA
POL#:
Feed index Number
This is the zero-based feed index number. It is tied to the data on the screen. You may SCROLL through
all available feed indexes using the SCROLL keys. Press ENTER to move the cursor to other data fields.
The feed index is sensed via Inputs A, B, and C from connector J13B -- pins 10, 12, and 14 respectively.
The current state of these inputs can be viewed in the LIMITS maintenance screen.
AZIM CW:0
ELEV UP:1
POL CW:0
<BKSP>MAKE LIMITS INACTIVE
The inputs are combined as bits to create a feed index. The MSB is Bit C (Input C) and the LSB is Bit A
(Input A). For example, in the condition indicated above with the A=1, B=1, and C=0 the sensed feed
index is 3.
Chapter 3
VREF:2.50
OFF:
0.0
CW:
90.0
SF: 48.45
CCW:1
STOW:0 (0-OFF)
DN:1
STOW:1 (1- ON)
CCW:1
STOW:* A:1 B:1 C:0 D:0
103
CONFIG-POL
REF:0
LIMITS
ACTIVE
<MODE>EXIT
Software
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