Agilent Technologies E5052A Programmer's Manual page 500

Communication with External Instruments Using 24-bit I/O Port
Preset States at Power-on
Preset States at Power-on
The 24-bit I/O port is set at power-on as follows (not affected at reset).
Port A High (All Bits)
Port B High (All Bits)
Port C Input
Port D Input
PORT C STATUS Low
PORT D STATUS Low
/OUTPUT1 High
/OUTPUT2 High
/SWEEP END High
/PASS FAIL High
500
C