DIGITAL INPUT 

E. Beise			March 1, 2001

This version uses the Nov 15, 1999 notation for the G0 valve panel
(after changeover to SAMPLE-type notation).

The majority of the digital input is valve status. The ADIO #1
and ADIO #2 slot A connectors will comprise the input. The valve micro
switches will be wired two 2 bits of input with the following
arrangement. The switches normally transmit 5 V if they are OPEN.
They close when the valve goes to fully OPEN or CLOSED, both 
will be open if the valve is somewhere in between.

	"0" = 0 V		00 = power failure (no 5 V)
	"1" = 5 V		01=closed     (O switch OPEN)
				10=open	      (C switch OPEN)
				11 = halfway  (both switches OPEN)

The cabling will be such that each 16-pin connector to breakout
box #1 (BB1) will contain 4 valves, so let's call each connector
a "cluster". This allows the possibility for each valve to have its
own ground, although on a given valve, the two grounds
will be wired together (3 wires per valve at the panel, 4
wires per valve in the cable going to the controls). There is room
on BB1 for 12 clusters, so there is plenty of spare.

The first bit will be the "OPEN" valve position (i.e., 
at 5 V if CLOSED microswitch is OPEN), and the 2nd bit will be
the "CLOSED" valve position (at 5V if the OPEN microswitch is OPEN).

The pins on the ADIO start counting at 1. The channels start
counting at 0.

			ADIO#     "High" pin	GND pin ADIO ADDRESS
CLUSTER 1 -->	MV1	 1-A		3,4	 2	X A0,A1
		MV30		        5,6	 2	X A2,A3
		MV2			7,8	 2	X A4,A5
		MV7			9,10	 2	X A6,A7

			ADIO#     "High" pin	GND pin
CLUSTER 2 -->	MV4	 1-A		11,12	 23	X B0,B1
		MV21		        13,14	 23	X B2,B3
		PV21			15,16	 23	X B4,B5
		MV13			17,18	 23	X B6,B7

			ADIO#     "High" pin	GND pin
CLUSTER 3 -->   MV22	 1-A		32,33	 27	Y B0,B1
		MV9			34,35	 27	Y B2,B3
		MV10			36,37	 27	Y B4,B5
		MV11			38,39	 27	Y B6,B7

CLUSTER 4 -->	spares	 1-A		40,41	 48	Z A0,A1
				        42,43	 48	Z A2,A3
					44,45	 48	Z A4,A5
					46,47	 48	Z A6,A7
	
			ADIO#     "High" pin	GND pin
CLUSTER 5 -->	MV29	 2-A		3,4	 2	X A0,A1	
		MV32		        5,6	 2	X A2,A3
		MV20			7,8	 2	X A4,A5
		SV13			9,10	 2	X A6,A7

			ADIO#     "High" pin	GND pin
CLUSTER 6 -->   PV12	 2-A		11,12	 23	X B0,B1
		MV12			13,14	 23	X B2,B3
		spare1			15,16    23	X B4,B5
		spare2			17,18	 23	X B6,B7

			ADIO#     "High" pin	GND pin
CLUSTER 7 -->   MV27	 2-A		32,33	 27	Y B0,B1
		MV28			34,35	 27	Y B2,B3
		MV31			36,37	 27	Y B4,B5
		MV8			38,39	 27	Y B6,B7

			ADIO#     "High" pin	GND pin
CLUSTER 8 -->   spares	  2-A		40,41	 48	Z A0,A1
					42,43	 48	Z A2,A3
					44,45	 48	Z A4,A5
					46,47    48	Z A6,A7


For Breakout Box wiring, the remaining clusters are spare

			ADIO#     "High" pin	GND pin
CLUSTER 9 -->	spares	 3-A		3,4	 2	X A0,A1	
				        5,6	 2	X A2,A3
					7,8	 2	X A4,A5
					9,10	 2	X A6,A7

			ADIO#     "High" pin	GND pin
CLUSTER 10 -->  spares	 3-A		11,12	 23	X B0,B1
					13,14	 23	X B2,B3
					15,16    23	X B4,B5
					17,18	 23	X B6,B7

			ADIO#     "High" pin	GND pin
CLUSTER 11 -->   spares	 3-A		32,33	 27	Y B0,B1
					34,35	 27	Y B2,B3
					36,37	 27	Y B4,B5
					38,39	 27	Y B6,B7

			ADIO#     "High" pin	GND pin
CLUSTER 12 -->  spares	 3-A		40,41	 48	Z A0,A1
					42,43	 48	Z A2,A3
					44,45	 48	Z A4,A5
					46,47    48	Z A6,A7



In the GAS PANEL display, the valves should be:
	 GREEN  = OPEN
	 RED    = CLOSED 
	 YELLOW = HALFWAY 
	 BLACK  = POWER FAILURE

A truth table indicating the "OK for BEAM" status of the valves will
come later.