Woodward AtlasPC, Hardware Manual

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Manual 85586V1 AtlasPC Digital Control, Vol. I
Woodward 105
Some users may not use both the RS-422 and RS-485 ports in their
application. In this case, one LED will stay on all the time. This only
signifies that one side of the board is not being used. It is not a
failure unless a flash code appears.
Application Developer Information
Many end users will be purchasing pre-programmed Atlas units and
will not need the information in this section. The information below is
aimed at programmers using the GAP programming tool provided by
Woodward.
Application developers must use version 3.04 or later of the GAP
programming tool when using a DLE board.
DLE Address Configuration
The DLE serial communications board is always configured to use address 10 in
Atlas systems. This is done because this board is a 16-bit board (versus 8-bit for
everything else) and it consumes two address spaces in the stack. To simplify
things, the board is factory-configured to be at address 10 to avoid address
conflicts with other boards, and there are warnings enabled in the coder in the
event that someone accidentally sets it incorrectly.
Driver Limitations
Each driver port (RS-485) can support only a single driver. The LM and EQ
series drivers have been built so that they can complete a communications
transaction in 5 milliseconds.