Furuno Doppler Speedlog DS-50 Installation Manual page 36

5.3 Remarks on Connection of Other Equipment
5.3 Remarks on Connection of Other Equipment
1. KP input Signal for reject interference
When a TX trigger pulse (KP) input to the system is giving off interference, note the
following.
1) Interference Rejection Signal Input Circuit
Two iuput ports are provided in the processor unit for connection of KP for interference
rejection. Use either port.
External KP1
External KP2
2) Current Requirement
Recommended current is 4 mA while the circuit operates normally at 2 mA to 20 mA. Adjust
resistance of output circuit in equipment connected to obtain recommended current.
3) Signal logic
Use signal logic equivalent to electric current flow when the system is transmitting.
29
TB3
22Ω
1
22Ω
2
3
22Ω
4
22Ω
5
6
Figure 5-9 KP input circuit
4mA
4mA