On 30 May 2005 21:44:12 -0700, "Pascal" <pascalg@uol.com.br> wrote:
Now, that the problem with the NMEA interface of GpsMap 276C with my>autopilot is practically solved with the 3.21 upgrade, I would like>to rise again the issue about the DSC, making the following questions,>which I tried to made to Garmin, but has not received a consistent>answer:>
<snip>>b) Knowing that the gps allows sending NMEA messages up to 3 devices,>and I am using only 2, can I use the COM1 to send NMEA to my VHF/DSC?
An NMEA "talker" should be able to drive at least 4 "listeners"
c)But, as I am receiving NMEA from the depth sounder, could I mix>this info with the NMEA from my VHF radio in the COM1 to receive the>"Position Reports", assuming that my new radio has NMEA in/out?
You can not simply "mix" the outputs of two NMEA talkers - you need to use an NMEA multiplexer to combine them.
f)And, If I could use the 2 serial ports set to NMEA, how I can setup>the COM2 to 9600 bps, which is the speed that DSC needs, if the actual>software of GpsMap276C does not allows me to make this change?
Are you sure the DSC data from the radio is sent at 9600? NMEA-0183 should all be 4800.
Web@shaw, GO TO PETER'S SITE!! http://vancouver-webpages.com/peter/ find:# NMEA Data Capture and Display Programs, Hardware, etc. in there you will find: "NMEA Hardware (Mulitplexers, protocol converters, filters, etc. are listed below)" => so scroll That is why I appreciate what Peter has done for all of us....
Matt Colie Lifelong Waterman, Licensed Mariner and Pathological Sailor
web1000@shaw.ca wrote:>>>c)But, as I am receiving NMEA from the depth sounder, could I mix>>>this info with the NMEA from my VHF radio in the COM1 to receive the>>>"Position Reports", assuming that my new radio has NMEA in/out?>>
You can not simply "mix" the outputs of two NMEA talkers - you need to>>use an NMEA multiplexer to combine them.>
how much do these things cost? I found one once and it was about USD> 500 >
On 31 May 2005 12:19:26 -0700, "Pascal" <pascalg@uol.com.br> wrote:
Thanks Peter,>
I really do not know if DSC is 9600 or 4800. By the way, as You are the>"pope" on NMEA, can You explain to us the format and meaning of the>DSC/DSCE and the AIVDM messages?
Sorry - I don't have any info on the DSC and DSE sentences. I have manuals for two radios that should send those sentences, but they don't give the sentence formats, and a short web search hasn't turned up anything useful.
If you have a radio that does send those sentences, you should be able to capture the data (with Windows Hyperterminal, or similar program). Once you have captured a few sample sentences, it should be fairly easy to determine the format. (See my NMEA FAQ for the formats of other sentences...)
