Furuno FS-1503, Service Manual

Page: 41 / 136

2-34
2.9 Interface
1. REMOTE (A), (B)
An optional REMOTE board is needed to connect DSC, NBDP terminal, remote station
(RB-500), and distributor (DB-500, DB-120).
One of two types of REMOTE boards is selected according to the connecting device, (A):
05P0457 for RS-232C and (B): 05P0458 for current loop.
⋅
Devices with RS-232-C: DSC-5/6, DP-5/6, DB-120, DB-500
⋅
Devices with current loop: RB-500, DB-500
Note) DB-500 is applicable to both types with modifications in the REMOTE
boards.
Level
Converter
(IC)
U4 (MC145406AP)
LINE IN
LINE OUT
RX MUTE
TX KEY
TXD
RXD
U5 (PC357NT)
U5 (PC357NT)
TX/RX AF Circuit
CPU Board
REMOTE (A)
(05P0457)
DSC/NBDP
REMOTE
1- TD-H
2- TD-C
3- RD-H
4- RD-C
5- F.GND
6- +12 V
7- +12 V
8- S GND
9- S GND
10- LINE OUT H
11- LINE OUT C
12- LINE IN H
13- LINE IN C
14- TX KEY
15- RX MUTE
16- NC
0 dBm
RS-232C
REMOTE (B)
(05P0458)
Level Converter
TXD
RXD
U2 (PC357NT)
Q1 (2SA1586)
Note)
REMOTE Boards A and B have a
different level converter.
Current Loop
REMOTE
RX MUTE
TX KEY
Figure 2-28 Remote Terminal Connection