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#1
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Cambridge 302 USB Port
I have a few questions regarding the USB port on the later Cambridge 302. The Cambridge manual leaves much to be desired in explaining what it can do.
Is the USB port supposed to supply power to a PDA or other device? Are you able to transfer files both ways with a PDA or PocketPC (logs and waypoints, etc.) or does the port only work with a laptop? What is the best way to use both the 303 and a PDA connected to the 302? |
#2
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Cambridge 302 USB Port
Hi Karl,
Good questions. Please see my answers below. Best Regards, Paul Remde Cumulus Soaring, Inc. "Karl Kunz" wrote in message news:16601193.26.1323215405491.JavaMail.geo-discussion-forums@pruu5... I have a few questions regarding the USB port on the later Cambridge 302. The Cambridge manual leaves much to be desired in explaining what it can do. Is the USB port supposed to supply power to a PDA or other device? - No. The USB port is only for connection to a PC. The PC is the master and the 302 is the slave. Since PDAs are generally also USB slaves, the 302 can't talk to them through the USB port. Are you able to transfer files both ways with a PDA or PocketPC (logs and waypoints, etc.) or does the port only work with a laptop? - You can transfer files to and from a 302 using a PDA - but only when the PDA is connected to the 302's RS-232 port (the one with the 9-pin connector). The USB port works only with PCs. What is the best way to use both the 303 and a PDA connected to the 302? - Connect the PDA to the 9-pin (DB-9) port and connect the 303 to the RJ (phone jack) port. They can both be used at the same time. |
#3
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Cambridge 302 USB Port
Thanks Paul. Will the DB-9 port provide power to the PDA?
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#4
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Cambridge 302 USB Port
Will the DB-9 port provide power to the PDA?
- Yes and no. The power source from C302 is problematic, especially when the battery on your PDA is charging. I have seen my C302 freezing and working erratically under those circumstances. It’s better if you provide the power via the power converter directly from your glider's battery. The USB port on the C302 is pretty much useless since you have to switch communication between serial and the USB with a dip switch which is located at the back of the C302. In my case its still requires taking the canopy off to reach the back side of the C302 anytime I like to use the USB port. You can also download flight logs and declare the task via the PDA serial communication and gliding softwa Winpilot(and a small program you can obtain for free from Cambridge aero) or the Connect me from seeyou. GK |
#5
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Cambridge 302 USB Port
If you use a separate power source as you describe, how do you tie it into the serial cable?
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#6
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Cambridge 302 USB Port
On Dec 7, 11:49*am, Karl Kunz wrote:
If you use a separate power source as you describe, how do you tie it into the serial cable? Serial communication doesn’t carry power over the same media as the communications. So Pins: 2 is RX and Pin 3 is TX. Pins 5 and 6 are 5VDC and Ground (if I remember correctly). Tim has the plug diagram on his web site. You can purchase a premade converter for the PDA, if you purchase the Oudie it already comes with a premade cable. Or you can make one yourselves |
#7
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Cambridge 302 USB Port
On Dec 7, 10:39*am, GK wrote:
Will the DB-9 port provide power to the PDA? - Yes and no. The power source from C302 is problematic, especially when the battery on your PDA is charging. I have seen my C302 freezing and working erratically under those circumstances. It’s better if you provide the power via the power converter directly from your glider's battery. GK I have heard this same message on several occasions about the 302 not being able to supply enough power to a PDA with a low battery and then causing issues. This is not my experience. I am using a 302 with a HP2215 that at times has a totally flat battery when I plug it into the cradle (and the 302's RS-232 connector) at the field. I have never had an issue. Might this have to do with the vintage of the 302? Mine is about 6 years old without the USB connector. BTW: I store everything on a CF or SD card in the HP2215 so I don't keep it plugged in and don't care if the PDA looses its memory contents or not. Its a better way to go IMHO. |
#8
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Cambridge 302 USB Port
On Dec 7, 9:39*am, GK wrote:
Will the DB-9 port provide power to the PDA? - Yes and no. The power source from C302 is problematic, No problem with mine powering an Aero 1530 for the last 9 or so years. Of course it doesn't normally need a back light like some other PDAs. Although I try to have the PDA fully charged before use in the glider it isn't always. Andy |
#9
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Cambridge 302 USB Port
Hi,
I'm sorry, but I must respectfully disagree with your comment about the 302 not being able to power a PDA. I have used many different PDAs with a 302 for years with no problems. I think customers have problems when they connect a PDA with the PDA's battery low. PDAs with low batteries can draw a LOT of current (over 1 A). The 302 can supply plenty of current for all PDAs and PNAs I've seen - as long as they are fully or nearly fully charged. Paul Remde Cumulus Soaring, Inc. "GK" wrote in message ... Will the DB-9 port provide power to the PDA? - Yes and no. The power source from C302 is problematic, especially when the battery on your PDA is charging. I have seen my C302 freezing and working erratically under those circumstances. It’s better if you provide the power via the power converter directly from your glider's battery. The USB port on the C302 is pretty much useless since you have to switch communication between serial and the USB with a dip switch which is located at the back of the C302. In my case its still requires taking the canopy off to reach the back side of the C302 anytime I like to use the USB port. You can also download flight logs and declare the task via the PDA serial communication and gliding softwa Winpilot(and a small program you can obtain for free from Cambridge aero) or the Connect me from seeyou. GK |
#10
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Cambridge 302 USB Port
Thanks all, I believe you have answered all my questions. As pointed out, the USB port is pretty useless unless you are going to lug a laptop out to the glider all the time exchange files and with having to toggle the switch on the back of the 302 it is a real pain in the ass to have to remove the canopy on our ASW20 to get at it. I think our best solution is to use the serial port with a PDA for file transfers.
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