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June 2004 Isis® Sonar User's Manual, Volume 2 110

Table F-2. Jumper settings on the PCB affecting the SIU4 and SIU4-2

Jumper

Number

What It Affects Possible Settings

for This Jumper

1 Trigger Out Polarity Open: Invalid, no trigger out

1–2: Positive (+5V) trigger out

2–3: Negative (-5V) trigger out (default)

2 Trigger Holdoff Open: Subbottom 125 ms

1–2: Standard 25

ms (default)

2–3: Side-scan 10 ms

3-6 Output Signal Clip

(Channels 1–4)

Header Not Present: Clipping not available [Default

for Isis (C31)]

Open: Signal not clipped [Default for Q-MIPS]

Closed: Signal clipped at

+ 2.5 V

[Default for Isis (C32)]

7 Grounding Scheme Pins 1 and 3 shorted: Chassis and power grounds

connected

Pins 2 and 4 shorted: Signal and power

grounds connected (default)

Pins 5 and 6 shorted: Signal and chassis grounds

connected

Appendix F: Working with Signal Interfaces

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