Bob, I have two CP150’s, a slightly earlier version than your 155, and can confirm that they do accept all the standard NEMA 0183 codes used for navigation. Mine do require an external antenna to use its internal GPS, but it sounds like you are already doing that. But they certainly don’t use that for external input. I use mine as a display of COG and SOG that it is getting from the chartplotter at the helm. You do need to match the baud rates, of course. Also, note that the 150 (and I assume 155) do NOT have differential inputs. Instead, what is usually the - NMEA input is called “ground”, pin 3, and the wire is green. The input wire for port 1, pin 4, is blue.
You may have missed that you have to put the CP150 into SLAVE mode to disable its own GPS unit and use it as a monitor. Here is the page in the manual that explains how to do that: SLAVE Press the “MENU” + ADVANCE SETUP + “ENTER” + INPUT OUTPUT + “ENTER” + INTERNAL GPS SETUP + “ENTER” + OPERATING MODE + “ENTER”+ SLAVE + “ENTER” If you don’t have the manual, I can send you a pdf copy. Eric Cat's Paw C&C 35 Mk II Mattapoisett, MA > On Feb 21, 2016, at 12:00 PM, cnc-list-requ...@cnc-list.com wrote: > > From: "bobmor99 ." <bobmo...@gmail.com <mailto:bobmo...@gmail.com>> > To: cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com> > Subject: Re: Stus-List Replacement Depth Transducer > Message-ID: > <cam7ccykmiz1yy6s973bghvjjez3ftzn9aiwkdzcicjgdjbt...@mail.gmail.com > <mailto:cam7ccykmiz1yy6s973bghvjjez3ftzn9aiwkdzcicjgdjbt...@mail.gmail.com>> > Content-Type: text/plain; charset="utf-8" > > Hi Joel, > > It's unclear, from the manual, whether the GPS info must come into the > Standard Horizon (SH) CP155C chartplotter via the connection to an external > GPS antenna (the typical setup) or whether it could alternatively come in > via the NMEA 0183 inbound wire in the Power and NMEA cable (which I do > have). I tried sending a NMEA GPS data stream into the the plotter via the > latter path, trying output from a handheld Garmin GPS and from a PC's > serial (DB9) port but neither stream was seen by the Chartplotter. (I > verified baud rates and all that.) > It's looking like the inbound (to the plotter) NMEA wire in the Power and > NMEA cable is just for DSC and DSE messages. > It seemed like a doable hack, but now I don't think that's the case. > Seeing as I don't have the plug at the end of the "Smart GPS Cable", I'm > going to bail out on this one. > Cheers, > Bob M > P.S. Perhaps too much information, but I would have used the NMEA 0183 GPS > output from my new SH VX2200 radio as the GPS source if the SH CP155C were > able to ingest it via the Power and NMEA cable. > > > On Sat, Feb 20, 2016 at 9:29 PM, Joel Aronson via CnC-List < > cnc-list@cnc-list.com <mailto:cnc-list@cnc-list.com>> wrote: > >> Does the 155 require an external antenna? >> Joel >> >>
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