Furuno IB-681 manual Wiring between HSD modem and communication unit, Ground, J11

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.

POWER

DIMMER

LOCK

		MOBILEINMARSAT-B
				EARTH	STATION
		COMPASS
		BEARING
AOR-		ELEVATION
		S	LEVEL
AOR-WEST
POR	EAST	TEL
I				1
OR		TEL
				2
READY		TEL		3
TX		TEL		4
FAIL		TEL		5
		TEL
				6
		TELEX
		DATA

J11

J7	J9
J8

Connector	RF CONV
assy.	Board
TX IF		J9
RX IF		J7
REF		J8
(DGPS		(J11)
OUT)

RF CONV Board

Figure 23 Communication unit, right side view

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).

TX IF

RX IF

REF

COMMUNICATION

UNIT IB-281

Coaxial cable (Max. 5 m, BNC-P-55UX2)

TX IF
RX IF
REF HSD	16S0277
MODEM		Ship’s
IB-681		mains

HSD CTRL

HSD CTRL

Serial cable (Max. 5 m, 17JE-573-2 harness)

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.

CAUTION

Ground the equipment to prevent electrical shock and mutual interference.

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