Re: [Soekris] +5V power on Net4501
On Mon, 28 Jul 2008 19:39:29 -0400 (EDT), Jed Clear wrote: On Mon, 28 Jul 2008, Jed Clear wrote: If you'd rather not mess around with getting power from pin 10, and aren't otherwise using your USB connector, it is a +5V source, with enough hampsters for the LVC, at least with no internal HDD. Cutting up a spare USB cable is probably the easiest way to get connected there. This also lets you use a standard 2x5 to DE-9 cable for COM2:. Of course if you're putting a 2x5 header on the LVC cable anyway, never mind. Forgot to add that I put DE-9 and USB connectors on my GPS 18 so I could move it between different PCs. Moving it around is necessary since Garmin updates firmware via MSWindows and my Soekris is MS free. -Jed I have been doing a bit of work to make a small box that has a 15 pin connector to take either a 18-LVC or a 17-HVC as input and drives 2 RS232 outputs, one of which can talk back. Power is obtained using a USB cable with a B socket on the box with only Gnd and +5 connected. The RS232 signals from the GPS are buffered with the neat little charge pump internal +/- supplied Max chips so no need to provide them with anything but 5V. To drive the HVC units a few extra components go on the board to pump the 5V to 12V but the cables terminate differently so that you won't kill a LVC unit if you have the 12V on board. The schematics are hand drawn atm and the prototype is not finished due POW but my 17 is on a 3m mast ready to clamp onto a gable end to get a good view of the sky. I'm keen to get it going but I have to make a quid to stay alive. More news when it's done. Anybody want to do the PCB layout? Probably single sided if we are not averse to a jumper or two Off-list replies (if you must) should go to the reply-to address. The sender address is a tarpit except for the list servers. Don't get stuck ;-)) R/ Rod/ /earth: write failed, file system is full cp: /earth/creatures: No space left on device ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
Thanks Ralph! That's exactly what I needed. Pin 10 works like a charm and no magic smoke release. [EMAIL PROTECTED] wrote: I drive a GPS 18 LVC using pin 10 of JP3, the COM2 connector. This is no substitute for proper specifications, but it has worked well for me, and I haven't let out any of the magic smoke. The 5V on pin 10 is not in the manual but is confirmed by Soren here: http://lists.soekris.com/pipermail/soekris-tech/2004-August/006501.html. Ralph On a Net4501 does anyone know how much +5V power can be provided by either pin 2 on the JP3 connector or by pin 4 on the JP9 connector? I have a Garmin GPS 18 LVC that I would like to interface with the unit that is rated at 60mA @ 5V. The manual doesn't seem to indicate how much power they are capable of and I just don't want to burn anything up. If it matters I'm currently powering the unit with a PoE splitter splitter rated for 12V @ .86A and I'm not using either of the PCI sockets. -- Timothy A. Holtzen Campus Network Administrator Nebraska Wesleyan University ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech -- Timothy A. Holtzen Campus Network Administrator Nebraska Wesleyan University ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
* Timothy Holtzen wrote: Thanks Ralph! That's exactly what I needed. Pin 10 works like a charm and no magic smoke release. [EMAIL PROTECTED] wrote: I drive a GPS 18 LVC using pin 10 of JP3, the COM2 connector. This is no substitute for proper specifications, but it has worked well for me, and I haven't let out any of the magic smoke. The 5V on pin 10 is not in the manual but is confirmed by Soren here: http://lists.soekris.com/pipermail/soekris-tech/2004-August/006501.html. Ralph I use the same setup on 4801 and 5501 as well. I suggest you put a a fuse in the line, as described in the Garmin GPS 18 LVC manual. I further wired the PPS pin to the CTS signal of the serial port to use that for a bit more precision. On a Net4501 does anyone know how much +5V power can be provided by either pin 2 on the JP3 connector or by pin 4 on the JP9 connector? I have a Garmin GPS 18 LVC that I would like to interface with the unit that is rated at 60mA @ 5V. The manual doesn't seem to indicate how much power they are capable of and I just don't want to burn anything up. If it matters I'm currently powering the unit with a PoE splitter splitter rated for 12V @ .86A and I'm not using either of the PCI sockets. -- Timothy A. Holtzen Campus Network Administrator Nebraska Wesleyan University ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech -- Timothy A. Holtzen Campus Network Administrator Nebraska Wesleyan University ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
* Chris Babcock wrote: Can those LVC units be used for as a GPS reference time source for NTP? Yes. They output NMEA sentences, are fully (and easily) configurable and provide a PPS signal (which has to be turned on by sending the unit some commands). Timothy Holtzen wrote: Thanks Ralph! That's exactly what I needed. Pin 10 works like a charm and no magic smoke release. [EMAIL PROTECTED] wrote: I drive a GPS 18 LVC using pin 10 of JP3, the COM2 connector. This is no substitute for proper specifications, but it has worked well for me, and I haven't let out any of the magic smoke. The 5V on pin 10 is not in the manual but is confirmed by Soren here: http://lists.soekris.com/pipermail/soekris-tech/2004-August/006501.html. Ralph On a Net4501 does anyone know how much +5V power can be provided by either pin 2 on the JP3 connector or by pin 4 on the JP9 connector? I have a Garmin GPS 18 LVC that I would like to interface with the unit that is rated at 60mA @ 5V. The manual doesn't seem to indicate how much power they are capable of and I just don't want to burn anything up. If it matters I'm currently powering the unit with a PoE splitter splitter rated for 12V @ .86A and I'm not using either of the PCI sockets. -- Timothy A. Holtzen Campus Network Administrator Nebraska Wesleyan University ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
On Mon, July 28, 2008 1:26 pm, Marc Balmer wrote: * Chris Babcock wrote: Can those LVC units be used for as a GPS reference time source for NTP? Yes. They output NMEA sentences, are fully (and easily) configurable and provide a PPS signal (which has to be turned on by sending the unit some commands). The ntpd NMEA driver is atomized, meaning it will use the PPS signal if applied to the DTR pin (by default, you can specify CTS if needed). I observed on my setup that this will typically keep it synced to within 10-15 microseconds. If you don't mind voiding your warranty on the Net4501 you can solder a wire connecting the R62/R62 junction to a GPIO pin and driving that with the PPS you can get down to within about 1.5 microseconds, the limiting factor being temperature-dependent clock drift. If you really want to go nuts, you can remove the oscillator and replace it with a precision frequency source. Take a look at http://www.febo.com/pages/soekris/. I made my connections slightly differently, but haven't written it up yet. The oscillator hack is probably overkill when using a GPS 18 LVC, which is only specified to be accurate to 1 microsecond on the PPS. Truly impressive when for the cost of a Net4501 plus $60 US or so for the GPS 18 LVC you can get this level of accuracy. Ralph ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
On Mon, 28 Jul 2008, Marc Balmer wrote: * Chris Babcock wrote: Can those LVC units be used for as a GPS reference time source for NTP? Yes. They output NMEA sentences, are fully (and easily) configurable and provide a PPS signal (which has to be turned on by sending the unit some commands). I have one doing that very job with a 5501. I use the $GPRMC sentence and turned of the rest. ISTR that was the sentnece recommended by the ntp.org s/w. If you'd rather not mess around with getting power from pin 10, and aren't otherwise using your USB connector, it is a +5V source, with enough hampsters for the LVC, at least with no internal HDD. Cutting up a spare USB cable is probably the easiest way to get connected there. This also lets you use a standard 2x5 to DE-9 cable for COM2:. Of course if you're putting a 2x5 header on the LVC cable anyway, never mind. If you haven't purchased the GPS 18 LVC yet, I seem to recall you could get it with two different length cables. I have 5m and I think the other option was 3m. -Jed ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
Re: [Soekris] +5V power on Net4501
On Mon, 28 Jul 2008, Jed Clear wrote: If you'd rather not mess around with getting power from pin 10, and aren't otherwise using your USB connector, it is a +5V source, with enough hampsters for the LVC, at least with no internal HDD. Cutting up a spare USB cable is probably the easiest way to get connected there. This also lets you use a standard 2x5 to DE-9 cable for COM2:. Of course if you're putting a 2x5 header on the LVC cable anyway, never mind. Forgot to add that I put DE-9 and USB connectors on my GPS 18 so I could move it between different PCs. Moving it around is necessary since Garmin updates firmware via MSWindows and my Soekris is MS free. -Jed ___ Soekris-tech mailing list Soekris-tech@lists.soekris.com http://lists.soekris.com/mailman/listinfo/soekris-tech
