Actisense USG-1-B-485 Manual de usuario descargar pdf (Pagina 8)

NMEA 0183 Input

The NMEA 0183 differential Opto-isolated input is

designed to handle a variety of NMEA 0183 device output

specications. The user must determine (from device

manufacturer’s information) if the device(s) required to be

connected to the Actisense USG-1 conforms in full to the

NMEA 0183 network communication standard. If it does

not, the exible Actisense USG-1 inputs should still be

capable of interfacing with the device, though this is not

guaranteed.

Figure 2 shows a typical installation with an NMEA Talker

and an NMEA Listener connected to the USG-1.

The NMEA Talker connections may be marked either A/B

or +/- if the talker is a differential drive device, or Tx/GND

for a single-ended device.

NMEA 0183 (ISO-Drive) Output

The NMEA 0183 buffered output is capable of driving up

to 10 NMEA 0183 fully compliant Listening devices, or a

mixture of NMEA 0183 Listening devices and a Personal

Computer (PC) communication port.

However it is only recommended to connect one

listener to the USG-1. If multiple instruments are

connected in parallel to the USG-1, there will be a

chance that isolation will not be maintained between

them, as some of the connected devices may not have

correct opto-isolated inputs.

If the user manuals for the connected instruments indicate

that all the listeners are opto-isolated, then they may be

safely parallel connected into the ISO-Drive output, and

safe isolation will be maintained.

The connections on an NMEA Listener may be marked

either A/B or +/- if the Listener is a differential drive device,

or Rx/GND for a single-ended device. Refer to gure 2.

The ground (GND) connection must not be connected.

Connecting NMEA 0183 devices

Figure 2 – NMEA 0183 connections

NMEA

Listener

A/+/RX

NMEA

Talker

B/-/GND

A/+/TX

B/-/GND

Do not connect

Notes:

1. To complete the NMEA 0183 standard, all device

interconnection NMEA cables used should meet the

two-conductor, shielded, twisted pair conguration

specication. The shield connection of these wires

should be connected at the instrument end only to

prevent ground loops.

2. Throughout these connection diagrams, the wire

colours represent those actually used on the supplied

Actisense USG-1 data cable. When using the

supplied cable, simply use the colours indicated to

connect to your NMEA 0183 instrument.

3. Refer to the Specications section for the full details

on input/output specications.

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Actisense USG-1-B-485 Manual de usuario Pagina 8

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