Wiring Between Hsd Modem And Communication Unit; Ground - Furuno IB-681 Operator's Manual

12. Attach the rear panel and mount the power supply unit.
13.Connect the four plugs from the connector fixing plate to the RF CONV Board as shown
in Figure 23.
F E
L C
P O
W E
P O
W E
R
R
D I M D I M
D I M
M E M E
M E
D I M
M E
R R
R
R
L O L O
L O
C K C K
C K
L O
C K
14. Attach the cover.
15. Plug in all connectors to the rear panel.

5.2.3 Wiring between HSD modem and communication unit

1. Connect the communication unit to the IB-681 with three coaxial cables (TX IF, RX IF,
REF connectors) and one serial cable with 9 pin connector (HSD CTRL connector).
COMMUNICATION
UNIT IB-281
Figure 24 Connection of IB-681 and communication unit

5.2.4 Ground

Connect the copper strap (supplied) between
the earth terminal on the IB-681 and ship's
superstructure.
O M
8 1
I N M
I N M
A R
M O
S A A R
B I L
T - B
M O
E E
A R
S A
T H
B I L S T
A T T - B
I O
N
E E
C O
A R
C O B E
M P M P
E L B E A S T H
A O A R
A R S
E L I N G
S L A S
A O E V
A O E V
S T
R - R - I N G
A T
W E S L
I O
A O P O S
E V E V A T
S T N
R - R - W E A T
T E E L
E A
P O
I O
S T
R R E L I O
T E
E A T E
I O L 1
L 1 S T
R R
N
T E T E
R E L 2 L 2 S T
T E T E
R E T X L 3 L 3
A D
A D
T E T E
Y
T X F A L 4
L 4
T E
T E Y
F A L 5
L 5
I L
I L
T E T E
L 6 L 6
D A T E
L E
L E
X
D A
T A T A
X
RF CONV Board
Figure 23 Communication unit, right side view
Coaxial cable (Max. 5 m, BNC-P-55UX2)
TX IF
RX IF
REF
HSD CTRL
Serial cable (Max. 5 m, 17JE-573-2 harness)
Connector
assy.
TX IF
RX IF
J11
REF
(DGPS
J9
J7
OUT)
J8
I O
N
TX IF
RX IF
REF
HSD
MODEM
IB-681
HSD CTRL
26
RF CONV
Board
J9
J7
J8
(J11)
16S0277
Ship's
mains
CAUTION
Ground the equipment to
prevent electrical shock
and mutual interference.