NDC comm NDC-3 - Manual (Page 7)

Page 7 © 2005 Active Research Limited
1. Four NMEA 0183 inputs.
All NMEA 0183 inputs are of the differential opto-
isolated type and use the unique Actisense™ low
current drain circuitry (2mA @ 2.0v) to conform in full
with the NMEA 0183 marine electronic device network
communication standard, and are flexible enough
to interface to most fully and partially compliant
devices.
2. An NMEA (data combined) 0183 output.
The NMEA 0183 output comprises of three
connections: ‘ +’, ‘-‘ and ‘Ground’ and conforms in full
to the NMEA 0183 standard. This allows the NDC to
interface to various different devices that require any
combination of these outputs.
3. An RS-232 input/output.
The bi-directional RS-232 port is designed for direct
connection to a Personal Computer (PC) or other
marine device capable of interfacing to a standard
RS-232 port.
4. Battery supply input.
Note:
1. To complete the NMEA 0183 standard all device
interconnection NMEA cables used should meet the
two-conductor, shielded, twisted pair configuration
specification. The shield connection of these wires
should be connected at the instrument end only to
prevent ground loops.
2. Refer to the Specifications section for the full details
on input/output specifications.
3. If the laptop / PC to be used with the NDC does not
have an RS-232 serial port available, the Actisense™
USB to RS-232 adapter cable has been tried and
tested to provide a compatible communications port.
Please visit the Actisense™ website for full details
on this, and other Actisense™ products.
The NMEA Data Combiner (NDC-3) has screw-terminal “Phoenix” type external connections for: -
Connections
Figure 1 – All external connections
NMEA DA
TA COMBINER
99999
NDC
-3-B