Keysight Technologies N5224/5A Service Manual page 141

Theory of Operation
Synthesized Source Group Operation
HANDLER I/O
PWR I/O
Table 5-1 TEST SET I/O Connector Pin Assignments
DB-25 Female Connector
Pin Numbers Name
1 SEL0
2 Sweep Holdoff In
3–6 AD12–AD8
7 GND
8 LAS
9–11 AD4–AD2
12 GND
13 Interrupt In
14 +22 V
15–16 SEL1–2
17 AD11
18 SEL3
19–21 AD7–5
22–23 AD0–1
24 LDS
25 RLW
Keysight N5224A/25A Service Guide
A rectangular 36-pin, female connector providing four independent parallel input/output
ports, nine control signal lines, one ground, and a power supply line. This connector has Type
2 output pin assignments as listed in
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).
Connector settings can be changed using SCPI and COM commands. The settings are not
accessible from the front panel.
A DB-9 female connector. Pin assignments are listed in
Function
TTL out, test set select bit 0, tied to 0 V
TTL in, low level holds off sweep
TTL I/O, address and latched data
0 V, ground reference
TTL out, active low address strobe (1 μs min)
TTL I/O, address and latched data
0 V, ground reference
TTL in, low level (10 μs min) aborts sweep
+22 Vdc, 100 mA max.
TTL out, test set select bits 1-2, tied to 0 V
TTL I/O, address and latched data
TTL out, test set select bit 3, tied to 0 V
TTL I/O, address and latched data
TTL I/O, address and latched data
TTL out, active low data strobe (1 μs min)
TTL out, high = read, low = write
Table 5-2 on page 5-16.
Table 5-6 on page 5-17.
5-15