Keysight E4990A - Page 311

Programming
301
A slash (/) symbol preceding signal names means that they are negative
logic (active low).
Pin number Signal name Signal specification
Pin
Number
Signal Signal Specification
1 GND 0 V. Ground
2 /INPUT1
When this port receives a negative pulse,
/OUTPUT1 and /OUTPUT2 are changed to the
Low level.
3 /OUTPUT1
Changes to the Low level when /INPUT1
receives a negative pulse. A command is
available for altering the Low/High level logic.
4 /OUTPUT2
Changes to the Low level when /INPUT1
receives a negative pulse. A command is
available for altering the Low/High level logic.
5 /PORT A0 Bit 0 of port A (8 bit parallel output port).
6 /PORT A1 Bit 1 of port A.
7 /PORT A2 Bit 2 of port A.
8 /PORT A3 Bit 3 of port A.
9 /PORT A4 Bit 4 of port A.