Installation manual

14 |

Wiring | NSO-II Installation Manual

NMEA 0183 device connection

The NSO-II has four serial ports, which are connected to via two discrete cables. Each cable

has one set of connections for NMEA 0183 Receive and Transmit. Both the baud rate (up to

38,400 baud) and sentences output by the NSO-II, can be conﬁ gured. Refer to “NMEA 0183

supported sentences” on page 40 for a complete list of sentences.

1 NMEA0 183 RX_A (balanced) (brown)

2 NMEA0 183 RX_B (balanced) (brown/white)

3 NMEA0 183 TX_A (balanced) (green)

4 NMEA0 183 TX_B (balanced) (green/white)

¼ Note: The majority of NMEA 0183

devices communicate at 4,800 baud. AIS is a

common exception, and normally transmits

at 38,400 baud.

Talkers and Listeners

Do not connect multiple devices outputing data (Talkers) on to any serial input (Rx) of the

unit. The NMEA 0183/RS422 standard is not intended for this type of connection, and data

will be corrupted if multiple devices transmit simultaneously. The output however may drive

multiple receivers (Listeners). The number of receivers is ﬁ nite, and depends largely on the

receiving hardware. Typically driving three devices is possible.

Ethernet device connection

Ethernet is used to interconnect high bandwidth devices such as radar, sonar, and other

Marine Processors. The NSO-II Marine Processor has three ethernet ports, which are

interconneted via an internal ethernet switch.

Connecting directly to three devices

Due to the internal switch, the NSO-II can connect to network devices directly, without the

use of a cross-over cable or external switch.

Connecting to more than three devices

If connecting more than three devices to an NSO-II , a network expansion Port (NEP-2) must

be used. If the connected device has its own additional ports, (eg LSS-2) these ports may be

used instead.

NSO-II_IM_EN_988-10392-001.indd 14 9/07/2013 3:53:19 p.m.