From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.perfora.net (mout.perfora.net [74.208.4.195]) by huchra.bufferbloat.net (Postfix) with ESMTP id E9AC5200252 for ; Fri, 23 Mar 2012 14:08:39 -0700 (PDT) Received: from [192.168.83.5] (c-76-97-152-51.hsd1.ga.comcast.net [76.97.152.51]) by mrelay.perfora.net (node=mrus4) with ESMTP (Nemesis) id 0M3iMD-1SSrCP09q5-00rhha; Fri, 23 Mar 2012 17:08:38 -0400 Message-ID: <4F6CE652.2010309@c3energy.com> Date: Fri, 23 Mar 2012 17:08:34 -0400 From: "Ron Frazier (NTP)" User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.1.9) Gecko/20100722 Eudora/3.0.4 MIME-Version: 1.0 To: "questions@lists.ntp.org" , "thumbgps-devel@lists.bufferbloat.net" Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit X-Provags-ID: V02:K0:lVOewcMYoWW6YvzUOwZhxsejDOVrLeu6hD0WUTd5+Ir nbTizkIgvlQiA6YSTUiHApQFoV1gK1T8Eo+MtpgZQaAskUmfwn 4B02gYCB9OMaELeJyYqL46CqovHVfJIaI1nLBrNMA3kN1nLFef uMCs9V56JV5e/YpUbvE/mN+0DQh98Jn9k3NIts5Fvl9EAprxse d4xQ5EUwiRrinDyKrAg0DAIIAGJOYjqBizfSohzszd1aqpZ7ze 5nw32dLeLWpDWOHE5pelOoOPwDC6BIxKU/qm5M+HIm5t8M7DNc /dtcdqtImJzhdgw9TOgE0euJ7YJda0+vDNYzINfU5KwJjJy6FG ejO7boPGXVjjGawsrZfS1vvfhcjpM1wTRRN7nNTLo Subject: [Thumbgps-devel] YEA! My Sure Electronics GPS just arrived. X-BeenThere: thumbgps-devel@lists.bufferbloat.net X-Mailman-Version: 2.1.13 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 23 Mar 2012 21:08:40 -0000 Hi all, YEA! My Sure Electronics GPS just arrived. I ordered on 03/05/12 and it arrived on 03/23/12, so it took 18 days. My configuration is: GPS USB port --> PC 2nd USB port - for power only GPS serial port --> Trendnet TU-S9 (Prolific based) serial - USB adapter --> PC 1st USB port (same as I had the BU-353 on) GPS antenna port --> included antenna Using Terje's NMEA-MTK program, I sent the commands to the unit to engage WAAS, send only GPGGA, and change the baud rate to 57600 as follows. You can get help from the program as follows: nmea-mtk /? The board was already at 9600 baud transmitting several sentences. I sent this command to enable WAAS and set for GPGGA sentences only (the default action): nmea-mtk -p \\.\COM5 I verified that it's working with SirfDemo. This is OK as long as I don't send any commands from SirfDemo and use it for display only. I set the SirfDemo data source for COM5 at 9600 baud, connected to the GPS, and observed the NMEA data sentences. Then I disconnected SirfDemo. I sent this to change baud rate to 57600: nmea-mtk -p \\.\COM5 -c PMTK251,57600 I verified that it's working with this command. Now I have to send the new baud rate in the command so nmea-mtk will read the port and match the baud rate of the GPS. This reads out NMEA data for 10 seconds. nmea-mtk -p \\.\COM5 -b 57600 -t 10 I also verified that it's working with SirfDemo after settings its baud rate for the data source to 57600. At the moment, I'm using NMEA only through the serial port of the GPS. I haven't tried NMEA through the GPS's USB port, but I assume it would be similar, since, either way, I'm going though a serial - USB converter. The Sure board uses a CP2102 usb to uart chipset, whatever that is, but I never loaded the driver for it. Since my external TU-s9 adapter uses the same Prolific driver that the BU-353 GPS did, I'm just using that. I am currently testing in Windows. Preliminary graphs indicate I'm getting a variance of + / - 25 ms from my PC's clock to the GPS polling it every 8 sec. That's a bit disappointing, since I was getting + / - 10 ms from the BU-353 going through it's internal serial - USB converter. I'm going to monitor it for about a week and see how stable it is relative to the internet servers. Also, I'm hoping it doesn't have periodic heart attacks like the BU-353 did. I am testing indoors, as before. I have a question for someone with experience with the board. If I unplug the board, will it retain it's programming, or will it lose it? If it retains it, how long will it keep the data? If it loses it, how can I prevent that? Sincerely, Ron -- (PS - If you email me and don't get a quick response, don't be concerned. I get about 300 emails per day from alternate energy mailing lists and such. I don't always see new messages very quickly. If you need a reply and have not heard from me in 1 - 2 weeks, send your message again.) Ron Frazier timekeepingdude AT c3energy.com