L-3 Communications Navigation Echosounder LAZ 5100 - Manual (Page 15)

Page 2-3
L-3 ELAC Nautik
2.1.2 CABLING, CABLE LOCATION, CABLE SPECIFICATION
Critical point in cabling is the correct handling of the cable screens, especially for the transducer
cable.
The cable screens have to be grounded only at one point: at the echosounder.
In all connection boxes the screens are slide and not connected to ground.
Dismantling has to be as short as possible.
The transducer cable from transducer to the first connection box has to be fed through a steel
protection pipe.
From the first connection box to the echosounder three kinds of cable laying are mandatory
recommended:
• the cable is laid in a steel pipe
• a double-screened cable is used as transducer cable, the inner screen is one-side
connected to the echosounder's ground, the outer screen is one-side connected to the
ship's ground.
• the transducer cable has to be laid separately from other cables in a distance of
minimum 0.5 m.
Most important is not to lay single shielded cable in the vicinity of other cable.
NOTE: in any case shielded cable has to be used over the whole distance from the
transducer to the echosounder. All connection boxes must be metallic.
2.1.3 TRANSDUCER CABLE SPECIFICATION
The cable from the transducer connection box to the echosounder must be approved marine cable
according DIN 89158 or similar, like MGCG 2x1.5.
At least the requirement of a resistance <13 Ω/ km and a capacity of < 150 nF/ km must be fulfilled.
2.1.4 INTERFACES
Printer interface: Standard CENTRONICS parallel interface, cable length: 5 m max.
Serial NMEA input: Input for navigational data and time synchronisation
Serial NMEA output: Water depth and additional information, see chapter 3.5.
Both serial interfaces are RS 422.
Only equipment with RS 422 interfaces can be connected to the echosounder, otherwise the
interface electronic gets damaged.