Other connections, Connecting to a personal computer, Connecting to the battery supply – NDC comm NDC-3 User Manual

Page 9

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Page 9

© 2005 Active Research Limited

Other Connections

Figure 3 – RS-232 and Battery connections

Connecting to a Personal Computer

The RS-232 port can be connected to a PC communications

port using a cable conforming to the following

specification:

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 naturally yield higher

performance / higher Signal-to-Noise Ratio (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-3 should be connected to the

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

the NDC-3

RX should be connected to the TX of the

computer (pin 3). The

GND of the NDC-3 should be

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

Connecting to the battery supply

The

Actisense™ NDC-3 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 sufficient gauge to handle the

power requirements of the

Actisense™ NDC-3 (refer to

the

Specifications

sections).

Note:

1. Wire colours are for guidance only.

NMEA DATA COMBINER

99999

NDC-3-B

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