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modellbobby
Aquilotto
323 Posts |
 Posted - 14/04/2010 : 13:11:23
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| Please open another topic for BT and other connection solutions!!! |
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kestrel19
Falchetto
United Kingdom
158 Posts |
Posted - 14/04/2010 : 16:32:17
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| Done |
Soar the big sky |
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D-HIJU
Pulcino
Germany
88 Posts |
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smielek00
Pulcino
45 Posts |
Posted - 27/04/2010 : 23:42:19
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Any chance for an English translation?
Thank you. |
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bernie01
New Entry
1 Posts |
Posted - 03/05/2010 : 06:12:55
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D-HIJU,
would the circuit shown in Steckerbelegung.pdf work with Cambridge 302 vario, that supplies +5V and data stream at 4800 baud? I believe that the 302 can be set to higher than 4800, but defaults back to 4800 on power on.
Thanks, Bernie. |
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D-HIJU
Pulcino
Germany
88 Posts |
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benharker
New Entry
United Kingdom
3 Posts |
Posted - 16/05/2010 : 08:47:21
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Does the HP 314 expect TTL levels (0v to 5v) or CMOS levels (0v to 3.3v)?
Also, does anyone know what it is that makes it difficult to get the 314 to charge from 5v through USB cable? So far I have only managed to get mine to charge from the 240v wall plug converter supplies with the device.
Thanks, Ben |
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kestrel19
Falchetto
United Kingdom
158 Posts |
Posted - 16/05/2010 : 13:45:59
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The problem with charging from 5v isn't the USB lead, it's the 5v. source; it requires an "intelligent" switching 5v supply. Some devices (eg: the VBT-1 bluetooth converter I've just installed) provide this. Alternatively the genuine HP branded in-car chrger.
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Soar the big sky |
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benharker
New Entry
United Kingdom
3 Posts |
Posted - 16/05/2010 : 16:28:16
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Kestrel
Thanks for your reply. When you say switching do you mean a switch mode power supply? If so, that is what I am using already. Also, what do you mean by 'intelligent'? What does it do that a normal DC/DC power supply doesn't do?
Thanks, Ben |
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AlexM
Pulcino
United Kingdom
17 Posts |
Posted - 16/05/2010 : 23:19:05
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there are two ways to enable high charge mode on the HP314,
1) using the advanced USB signaling, as used by the original HP power supply. Or 2) by using a USB lead that has the sense pin (pin4) of the miniUSB plug connected to grnd. Problem is most mini-B USB leads don't have any pin4 connected. Sometimes you might find one if you're lucky. I've known some twin plug type leads to work fine. ie/ two USB-A plugs on one end, and mini-B on the other.
The HP314 expects 5v to charge as with most USB devices, but the data lines shouldn't exceed 3.3v. Some devices maybe 5v tolerant on the data lines but this cannot be assumed. 5v tolerance was removed from the USB standard sometime in 2008 and it wouldn't be good for reliability anyway.
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a.durbin
Aquilotto
USA
203 Posts |
Posted - 23/05/2010 : 19:30:23
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quote:
Originally posted by D-HIJU
4800 baud should be no problem for the circuit. Datasheet:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1780
How would that work? I see nothing in the data sheet that suggests the device will change the data transmit rate, only the signal levels. If 310/314 cannot operate at 4800 Baud and the 302 defaults to 4800 baud then doesn't the 310/314 have to include the signaling to command the 302 to a compatible baud rate?
Currently LK8000 does not support commanding a change in the 302 baud rate.
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Andy (GY) |
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benharker
New Entry
United Kingdom
3 Posts |
Posted - 24/05/2010 : 19:22:51
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Thanks Alex. That is exactly what I wanted to know.
Ben |
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bmw
New Entry
3 Posts |
Posted - 27/05/2010 : 10:30:43
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quote:
Originally posted by kestrel19
The problem with charging from 5v isn't the USB lead, it's the 5v. source; it requires an "intelligent" switching 5v supply. Some devices (eg: the VBT-1 bluetooth converter I've just installed) provide this. Alternatively the genuine HP branded in-car chrger.
... it seems that in order to let your HP314 recharge you need 3V voltage on your data pins. I discovered that recharging the HP314 works also with shorting the data pins (i.e. pin 2&3) while providing power supply (having 5V on pin 1 and connecting pin 5 to GND). |
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Bastoune
Pulcino
31 Posts |
Posted - 30/05/2010 : 17:09:03
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quote:
Originally posted by a.durbin
quote:
Originally posted by D-HIJU
4800 baud should be no problem for the circuit. Datasheet:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1780
How would that work? I see nothing in the data sheet that suggests the device will change the data transmit rate, only the signal levels. If 310/314 cannot operate at 4800 Baud and the 302 defaults to 4800 baud then doesn't the 310/314 have to include the signaling to command the 302 to a compatible baud rate?
Currently LK8000 does not support commanding a change in the 302 baud rate.
Andy, if a genius could find a way to solve this problem, it would be fantastic. I would love to get a Cambridge 302 but definitely want to use my 310 with LK_8000 with it.
Does anybody know how to solve this Baud rate conversion or setting problem with the IPAQ310 / Cambridge 302?
Bastoune |
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modellbobby
Aquilotto
323 Posts |
Posted - 30/05/2010 : 17:30:57
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quote:
Originally posted by Bastoune
quote:
Originally posted by a.durbin
quote:
Originally posted by D-HIJU
4800 baud should be no problem for the circuit. Datasheet:
http://www.maxim-ic.com/quick_view2.cfm/qv_pk/1780
How would that work? I see nothing in the data sheet that suggests the device will change the data transmit rate, only the signal levels. If 310/314 cannot operate at 4800 Baud and the 302 defaults to 4800 baud then doesn't the 310/314 have to include the signaling to command the 302 to a compatible baud rate?
Currently LK8000 does not support commanding a change in the 302 baud rate.
Andy, if a genius could find a way to solve this problem, it would be fantastic. I would love to get a Cambridge 302 but definitely want to use my 310 with LK_8000 with it.
Does anybody know how to solve this Baud rate conversion or setting problem with the IPAQ310 / Cambridge 302?
Bastoune
And again. Use K6 Team Mux for this!!!! |
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Topic |
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HP314 RS232 cable KK01 from Karim