Furuno Felcom 30, Installation Manual

Page: 36 / 55

29
ISDN bus termination
When longer than 10 meters, the end of the ISDN bus must be terminated by two resistors
as shown below. Only one bus/termination per CU.
Be aware that only one ISDN cable is permitted to be longer than 10 meters.
RX+
TX+
TX -
RX -
100 ohm
100 ohm
Alternative termination:
ISDN bus end plug
BUS-END
DO NOT
REMOVE
PC - asynchronous data communication
The driver used with the RS-232 B (DATA) port can
be switched to be used with the RS-422 (DATA) port
instead, see the Operator's Manual.
DTE
USB port
PC serial port
RS-422
TX- TX+ RX- RX+
ON
48V DC
SYNC
ALARM
RS-232 A RS-232 B
USB
ISDN
ISDN
ISDN
TX+ TX- RX+ RX-
NMEA- NMEA+
5 4 3 2 1
9 8 7 6
5 4 3 2 1
9 8 7 6
1 8
8 1
PC serial port
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