Furuno IB-681 - Manual (Page 12)

2
1.1.2 Rear panel
HSD DATA1 HSD DATA2
TX IF RX IF REF
AC100-220V
HSD CTRL
BREAKER
REF
RX IF
TX IF
HSD DATA 1
HSD DATA 2
HSD CTRL
Breaker (1A)
100-220 VAC
Earth terminal
Figure 2 IB-681, rear view
HSD DATA 1: RS-232 interface connector
HSD DATA 2: RS-449 interface connector
HSD CTRL: Conducts control data communications between communication unit and
HSD modem.
Breaker: The red button pops out when overcurrent flows inside the equipment. In this
case, find the cause of the overcurrent and push the button.
100-220 VAC: Connection of 100/220 VAC power.
REF: Receives reference signal from the communication unit.
RX IF: Receives IF signal from the communication unit.
TX IF: Sends IF signal to the communication unit.