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The 2008M / 2008 / 2016 NSL Unit Relay Backplane Boards
have both ribbon cable sockets and Relay Board sockets.
P1 & P2 Expansion from the previous Backplane or the NSL
Main Controller board.
P11&12 Expansion to the next Backplane.
P3 to 10 Connectors for the 2012 NSL Relay Boards.
(eight relay boards per backplane)
NSL Backplane Number Select (located between P1 and P2):
There may be up to 16 NSL Backplanes connected to an NSL
Main Controller Board. Each has a set of 16 positions for a
jumper plug. The first Backplane is jumpered for “1", the next for
“2", and so on up to “16".
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