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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