Actisense NMEA 0183 User Manual download pdf (Page 9)

NMEA Data Multiplexer - NDC-4

Other Connections

Figure 3 – RS232, USB and Battery connections

Battery /

Power Supply

PC or

Laptop

USB

PC or

Laptop

RxTx G

Connecting to the Battery Supply

TheNDC-4canbepoweredeitherbytheUSBconnection

orthroughanexternalpowersource.Ifbothpowersources

areavailable,thecurrentdrawnfromtheUSBsupplywill

be reduced to a trickle. If the external power source is

removed, the USB power will seamlessly take over, without

loss of data.

If the NDC-4 is powered from an external power source,

like a battery, it should be wired to the vessel’s battery

supply in the most direct manner possible, to minimize

interferencefromotherelectronicdevices.Thecableused

should be of sufcient gauge to handle the power

requirements of the NDC-4 (refer to ”Specications” on

page 19).

USB Warning!

USB power and battery power are NOT

isolatedfromeachother.Consultaqualiedinstallerto

ensurethereisnogroundloophazardwhenconnecting

both.Disconnectingasinglebatteryleadorturningoff

thesupplydoesNOTpreventthisgroundloophazard.

GroundloopdamageisNOTcoveredbytheguarantee.

For installs where the NDC-4 must still operate when

the PC is switched off, full PC isolation can be

maintainedbyusingPort0(‘OPTOIN0’and‘ISOOUT

0’) as the PC connection.

Connecting to a Personal Computer

TheUSBportcanbeusedtoconnectaPCtotheNMEA

0183system.AUSB cableisavailableintheformofan

upgradekitforvariantsthatdonotcomewithacable.The

partnumberwillinclude“USB”ifacableisprovidedwith

that variant (e.g. NDC-4-USB).

Alternatively,Port0(OPTOIN0andISOOUT0)canbe

usedtoconnectaPCintotheNMEA 0183systemby

using a serial port cable conforming to the following

specication:

1. A D-type female (socket) connector for the PC end of

thecable.

2.Aminimumof3coresarerequiredinashieldedcable.

Higherqualitycablewillyieldhigherperformance(SNR).

Mosttypical cableshave twotwistedpairsinside.Inthis

case, use one pair for the TX line and one for the RX line.

Use the spare wire in each pair as ground, and connect

thecableshieldtogroundonlyatthecomputerend.

3. The TXoftheNDC-4shouldbeconnectedtotheRX of

the computer (standard D-type, pin 2) and the NDC-4 RX

should be connected to theTX of the computer (pin 3).

The GNDofbothIN0andOUT0ontheNDC-4shouldbe

connected to the PC’s serial port ground (pin 5). See

“Figure26-DB9Connection”onpage9 ofthe“Fulluser

manual” available on the CD and from www.actisense.

com for a diagram of this wiring connection.

Note: Wire colours are for guidance only.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 ... 19 20

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Actisense NMEA 0183 User Manual Page 9

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