Positional Data; Connection Of Main Fail Signal; Ext Bk; Connection Of Handset - Furuno FS-1575 Service Manual

1. Positional Data

Connect a GPS to the transceiver unit. The system receives GNS, GGA, RMC, GLL,
and ZDA sentences. Basically, the IEC-61162-1ed.4.0 version of signal is connected.
Depending on setting, however, the NMEA Ver.1.5, 2.0, and 3.0 messages can be
received.
TD data will be output when a DSC message is received. The sentences are $CT DSC
and $CT DSE.

2. Connection of MAIN FAIL Signal

Connect MAIN FAIL signal output from an AC/DC power supply such as PR-850A to
FS-xx75T. When the "Main power source" is shutdown, it will be automatically
switched to "Radio battery" source to automatically set transmission power output to
"LOW." Furthermore, when the MAIN FAIL signal is detected, the message "Tx
Power reduced. Ship's main failure" will be displayed.

3. EXT BK

Make "BK" connections to a radiotelephone and receiver, as appropriate.
・TX KEY:
When the TX KEY(FS-xx75 is state of transmitting) signal is
activated, BK signal will be activated.
・RX MUTE: When the BK signal is activated, the external speaker and the
handset speaker will be muted.
T-CPU
FPGA
CPLD

4. Connection of Handset

Handset port is provided on the front and rear panels on the FS-2575C, respectively. Do
not connect a handset to both ports at a time. If one handset is in the On-Hook state, the
other one will be unable to transmit.
However, if both handsets are in the Off-Hook state, transmission from both handsets
will be allowed, provided that the handset of the front panel will be prioritized.
CONFIDENTIAL (internal use only)
This confidential document is used only by FURUNO authorized persons.
It is strictly prohibited to reproduce the document in whole or in part without prior written permission of FURUNO.
MOT
3.3V BK24V
U4
TX KEY N
Q2
Q1
3.3V BK24V
U7
RX MUTE N CPLD
CR5
Fig. 1.2.3 FS-xx75 Block Circuit Diagram
1-8
T-IF
TB6 -#16
BK24V
CR2
TB6 - #14
TX KEY N
TB6 - #17
0V
T-IF
TB6 -#15
RX MUTE N
TB6 - #17
0V
1.2 Installations