Furuno CI-88 Installation Manual page 48

4. ADJUSTMENT
Buffer circuit for negative-going KP
Interfering
Equipment
The following method also is available.
DIP switch settings
When KP signal is input to KP IN1, set the switch S1-#3 on the PCN Board 66P3924 to ON.
KP signal is positive logic: Set the switch S1-#1 on the PCN Board to OFF.
KP signal is negative logic: Set the switch S1-#1 on the PCN Board to ON
When KP signal is input to KP IN2, set the switch S1-#4 on the PCN Board 66P3924 to ON.
KP signal is positive logic: Set the switch S1-#2 on the PCN Board to OFF.
KP signal is negative logic: Set the switch S1-#2 on the PCN Board to ON
Output
When outputting keying pulse to suppress interference to other ultrasound equipment, take
the TX trigger pulse from TB4 (KP OUT), which is the KP terminal for external output.
4-14
KP out
2K
Approx.
300
Additional Circuit
12 V
Additional Circuit
Buffer circuit for keying pulse (KP)
PCN (66P3924)
5V
5V
CR12
5 to 15V CI-8810
Approx.
300
Interference
Rejector
CI-8810
TB4
H
C
Interference
Rejector
TB-4
Ω
220
7 H
KP OUT
8 C
TB4
H
C