Manual

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