Logic Card Backplane Connections: ---------------------------------- The Logic Card plugs into the Backplane using two 25 pin connectors. In addition there is a small backplane connector at the rear panel edge of the Logic Card that is used for mechanical support only. Connector 1 - Nearest the Front Panel Logic Card Pin Function and Connections --- -------------------------------------------------- 1 ? 2 ? 3 Ground runs to FP pins 7,8 4 ? 5 Ground runs to FP pins 11,12 6 Bulk -24 V power 7 Clean Ground CCW end of all FP 10-turn pots FP pins 33,34 8 Bulk +24 V power 9 Status signal from the Beam supply pin 16 10 Status signal from the Accelerator supply pin 16 11 Front Panel "Local Remote" Switch righthand from FP pin 40 12 Back Cover Microswitch Interlock "External Interlock" 13 Front Panel "Source On/Off" Switch input from FP pin 13 14 Front Panel "Auto-Manual" Switch input from FP pin 27 15 Front Panel "Local Remote" Switch righthand from FP pin 38 16 Under or Over Voltage Low Active signal from Support Brd pin 4 17 ? 18 Back Panel DB-25 pin 24 "Remote Emission" Open Collector Output 19 ? 20 Front Panel "Source Power" LED output to FP pin 43 21 Front Panel "Cathode" LED output to FP pin 41 22 Front Panel "Neutralizer" LED output to FP pin 39 23 Front Panel "Discharge" LED output to FP pin 37 24 Front Panel "Accelerator" LED output to FP pin 35 25 Front Panel "Beam" LED output to FP pin 31 Connector 2 - Nearer the Middle of the Logic Card Logic Card Pin Function and Connections --- -------------------------------------------------- 1 Front Panel "Emission" LED output to FP pin 29 2 Front Panel "Ext Interlock" LED output to FP pin 45 3 On-Off control signal to the Neutralizer supply pin 2 4 On-Off control signal to the Cathode supply pin 2 5 On-Off control signal to the Discharge supply pin 2 6 On-Off control signal to the Beam & Accel supplies pin 2 7 Accelerator 10-turn pot wiper input from FP pin 32 8 Cathode 10-turn pot wiper input from FP pin 28 9 Analog control signal to the Neutralizer supply pin 1 10 Analog control signal to the Discharge supply pin 1 11 Analog control signal to the Cathode supply pin 1 12 Analog control signal to the Accelerator supply pin 1 13 Emission Current monitor signal from the Neutralizer supply pin 10 14 Output signal from Logic Card to Support Card pin 5 that turns On/Off the driver for the coil on Power Relay 15 Neutralizer 10-turn pot wiper input from FP pin 26 16 Discharge 10-turn pot wiper input from FP pin 30 17 Analog control signal to the Beam supply pin 1 18 Beam Current 10-turn pot wiper input from FP pin 46 19 Current monitor signal from the Beam supply pin 10 20 Reference Voltage to Support Card pin 3 and to FP pin 36 which is the CW end of all FP 10-turn pots 21 Fil Current monitor signal from the Neutralizer supply pin 14 22 ? 23 Current monitor signal from the Discharge supply pin 10 24 Status signal from the Discharge supply pin 16 25 Fil Current monitor signal from the Cathode supply pin 14