Maretron DSM410, Руководство пользователя

Страница: 182 / 289

DSM410
User’s Manual
Page 166 Revision 1.7.2
6.24.1.2 Installation Description
This entry allows you to modify the NMEA 2000 installation description text strings. You can enter
any information you like here, such as the date the unit was installed, or the location in which it was
installed, for later reference. Tools such as Maretron N2KAnalyzer allow you to view these values
later. See Section 3.3.4 for details on how to enter a textual value.
6.24.1.3 NMEA0183 Settings
Several characteristics of the NMEA 0183 interface of the SSC200/SSC300 may be programmed
using the DSM410 display. This can be used for initial programming of a SSC200/SSC300 compass
even if only the NMEA 0183 interface is to be used after installation is complete. Figure 174 below
shows the possible programming options for the NMEA 0183 interface.
Figure 174
– SSC200/SSC300 NMEA 0183 Settings Screen
6.24.1.3.1 Baud Rate
The SSC200/SSC300 compass supports NMEA0183 communication at both 4800 baud and 38400
baud. All SSC200/SSC300 Compasses are shipped with a baud rate of 4800 baud. This value may
be changed by selecting the Baud Rate option in the menu, and pressing
Enter . The use the Scroll
Up and Scroll Down buttons to select the desired baud rate and press Enter to save the value.
6.24.1.3.2 Sentence / Rate Selection
The NMEA 0183 interface is a very low bandwidth interface. The SSC200/SSC300 is capable of
transmitting a wide variety of NMEA 0183 sentences, and can exceed the bandwidth of the NMEA
0183 interface if all sentences are transmitted at maximum rates, causing lost data in NMEA 0183
multiplexers or on the SSC200/SSC300 interface itself. It is important, therefore, to limit the types of
NMEA 0183 sentences transmitted only to those that are necessary for other products which are
connected to the NMEA 0183 interface. Figure 175 below shows the SSC200/SSC300 NMEA 0183
Settings -> Sentence/Rate Selection menu. In this menu, you can selectively enable and disable the
different NMEA 0183 sentences that the SSC200/SSC300 can transmit, and you can program the
transmission interval for the enabled sentences. In the figure, you can see that the HDG and ROT
sentences will be transmitted every 0.1 second (10 times/second), the ATT sentence will be
transmitted once per second, and the HDM and HDT sentences are disabled.