General Purpose Input/Output (GPIO) Connector

This 36-pin, parallel I/O port consists of the following:

• Four independent parallel input/output ports
  

• Control signal lines
  
• Power supply line

Since all signals are TTL-compatible, data input/output ports consist of two 8-bit output ports (Port A and Port B) and two 4-bit bidirectional ports (Port C and Port D). All input/output signals are factory set to negative logic. They can be reset to positive logic using a GPIB command.

Changing the internal connection to the test set motherboard, you can select between the standard and option output pin assignments.

Standard Assignment of Signals to Pins Optional Assignment of Signals to Pins Standard Assignment of Signals to Pins Pin Number Signal Name Signal Standard 1 GND 0V 2 INPUT1 TTL level, pulse input, pulse width >1 µs 3 OUTPUT1 TTL level, latch output 4 OUTPUT2 TTL level, latch output 5 Output port A0 TTL level, latch output 6 Output port A1 TTL level, latch output 7 Output port A2 TTL level, latch output 8 Output port A3 TTL level, latch output 9 Output port A4 TTL level, latch output 10 Output port A5 TTL level, latch output 11 Output port A6 TTL level, latch output 12 Output port A7 TTL level, latch output 13 Output port B0 TTL level, latch output 14 Output port B1 TTL level, latch output 15 Output port B2 TTL level, latch output 16 Output port B3 TTL level, latch output 17 Output port B4 TTL level, latch output 18 Output port B5 TTL level, latch output 19 Output port B6 TTL level, latch output 20 Output port B7 TTL level, latch output 21 Input/output port C0 TTL level, latch output/input 22 Input/output port C1 TTL level, latch output/input 23 Input/output port C2 TTL level, latch output/input 24 Input/output port C3 TTL level, latch output/input 25 Input/output port D0 TTL level, latch output/input 26 Input/output port D1 TTL level, latch output/input 27 Input/output port D2 TTL level, latch output/input 28 Input/output port D3 TTL level, latch output/input 29 Port C status TTL level, Input mode: Low, Output mode: High 30 Port D status TTL level, Input mode: Low, Output mode: High 31 Write strobe signal TTL level, Negative logic, Pulse output 32 (N/C) 33 PASS/FAIL signal TTL level, PASS: High, FAIL: Low 34 +5 V +5 V, 100 mA maximum 35 SWEEP END signal TTL level, Negative logic, Pulse output (width>10µs) 36 PASS/FAIL write strobe signal TTL level, Negative logic, Pulse output Return to Rear Panel Optional Assignment of Signals to Pins Pin Number Signal Name Signal Standard 1 GND 0V 2 INPUT1 TTL level, pulse input, (width >1 µs) 3 OUTPUT1 TTL level, latch output 4 OUTPUT2 TTL level, latch output 5 Output port A0 TTL level, latch output 6 Output port A1 TTL level, latch output 7 Output port A2 TTL level, latch output 8 Output port A3 TTL level, latch output 9 Output port A4 TTL level, latch output 10 Output port A5 TTL level, latch output 11 Output port A6 TTL level, latch output 12 Output port A7 TTL level, latch output 13 Output port B0 TTL level, latch output 14 Output port B1 TTL level, latch output 15 Output port B2 TTL level, latch output 16 Output port B3 TTL level, latch output 17 Output port B4 TTL level, latch output 18 Not used 19 Output port B5 TTL level, latch output 20 Output port B6 TTL level, latch output 21 Output port B7 TTL level, latch output 22 Input/output port C0 TTL level, latch output/input 23 Input/output port C1 TTL level, latch output/input 24 Input/output port C2 TTL level, latch output/input 25 Input/output port C3 TTL level, latch output/input 26 Input/output port D0 TTL level, latch output/input 27 Input/output port D1 TTL level, latch output/input 28 Input/output port D2 TTL level, latch output/input 29 Input/output port D3 TTL level, latch output/input 30 Port C status TTL level, Input mode: Low, Output mode: High 31 Port D status TTL level, Input mode: Low, Output mode: High 32 Output port write strobe TTL level, Negative logic, Pulse output 33 PASS/FAIL signal TTL level, PASS: High, FAIL: Low 34 SWEEP END signal TTL level, Negative logic, Pulse output (width>10µs) 35 +5 V +5 V, 100 mA maximum 36 PASS/FAIL write strobe TTL level, Negative logic, Pulse output Return to Rear Panel