Furuno FS-2570 - Manual (Page 29)

2-7
External BK
Terminal No. Signal name Function Object
17 BK (+) Output voltage: 24 VDC
Power of relay BK for
other radiotelephone
18 BK GND GND 0 V
19 Tx_KEY Go to GND on transmitting.
BK control for other
radiotelephone
20 Rx_MUTE
Receiver unit goes to off when
this line is GND. BK control from other
transceiver unit
21 SHIELD
Note: When GND line from other radiotelephone is connected to the chassis, float the
ground.
External
Battery
T-IF Board (05P0731)
+
-
24V TB1
TB2
BK GND BK (+)
Power of BK
T-IF Board
(05P0731) TB5
TX KEY
BK (+) 17
19
20
18
FS-1570/2570
E
Receiver
Relay
BK GND
Example of connection with receiver