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admin_0
1 Posts |
 Posted - 15 juil. 2005 : 17:44:33
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| Hi all, I'm new to GPS and to the forum. I recently purchased a Holux GM-210 GPS reciever that I hope to connect to my Seidio g2500 car kit for use with my handheld. The problem is that the Holux GM-210 that I ordered appears to have a USB connector only (not a serial ps/2-type connector) hard wired to the unit. Therefore it seems that the normal Seidio adapter cable (which connects via a ps/2 connector) will not work. I'd have no problem building my own connector cable, with a female USB plug on one end and an RJ-11 connector on the other. Seidio lists the pinout for the RJ-11 end on their website under the product information for the DIY cable they sell (http://www.seidioonline.com/ProductDetails.asp?ProductCode=CBGRW%2DRJ11). But I'm not sure if it will be as simple as connecting the corresponding USB wires to the wires indicated in the DIY cable pinout. The G2500 car mount outputs 5 V, which is the same as USB, so the 2 power wires seem okay, but the 2 signal wires could be a problem. Is the USB signal different than a GPS serial connection signal? Would it be safe (and would it work) to simply connect the corresponding wires? Any help is greatly appreciated! |
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admin_0
1 Posts |
Posted - 28 févr. 2006 : 20:39:37
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| I have the same issue...anyone figure this one out? |
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jgoggan
USA
330 Posts |
Posted - 08 mars 2006 : 17:03:10
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You cannot just connect these together -- USB communication is not directly compatible with the expected serial communication. Your best bet for doing this would likely be a USB to serial adapter of some sort -- but then you may have power issues actually depending on how much you can suck out of the Seidio mount before creating problems. (It may be fine, I just don't know.)
- John...
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Dell Axim X51v; Mapopolis (v4.x); SanDisk 512MB SD; Seidio G4500 Car Mount w/ wired Pharos button GPS |
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seidioseidio
45 Posts |
Posted - 13 mars 2006 : 23:51:01
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quote:
Originally posted by theminor
Hi all, I'm new to GPS and to the forum. I recently purchased a Holux GM-210 GPS reciever that I hope to connect to my Seidio g2500 car kit for use with my handheld. The problem is that the Holux GM-210 that I ordered appears to have a USB connector only (not a serial ps/2-type connector) hard wired to the unit. Therefore it seems that the normal Seidio adapter cable (which connects via a ps/2 connector) will not work. I'd have no problem building my own connector cable, with a female USB plug on one end and an RJ-11 connector on the other. Seidio lists the pinout for the RJ-11 end on their website under the product information for the DIY cable they sell (http://www.seidioonline.com/ProductDetails.asp?ProductCode=CBGRW%2DRJ11). But I'm not sure if it will be as simple as connecting the corresponding USB wires to the wires indicated in the DIY cable pinout. The G2500 car mount outputs 5 V, which is the same as USB, so the 2 power wires seem okay, but the 2 signal wires could be a problem. Is the USB signal different than a GPS serial connection signal? Would it be safe (and would it work) to simply connect the corresponding wires? Any help is greatly appreciated!
Hi,
I sent this question to our technical support department and here is what they said:
It would be easier for you to use our wired GPS adaptor for Holux GM-210 (part number CBGR-RJ11PS2M), available on our website (either www.seidioonline.com or www.seidio-europe.com) instead of going through the hassle customizing your own cable. You can click on the link below to make your selection:
http://www.seidioonline.com/index.asp?PageAction=VIEWPROD&ProdID=89
Please let me know if this answer helps; if not, we'll get more information for you.
David
davidsilver@seidio.com
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abumalik
2 Posts |
Posted - 27 mars 2006 : 19:33:18
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David,
The required connection is RJ11 to mini USB. The offered solution of RJ11 to PS/2 does not solve the issue.
I have the same issue , i guess many have and don't really know why they chosen RJ11 connection on thier mount. I tried to DIY a mini USB to RJ11 but could not get my PDA to cummunicate to the GPS receiver. I managed to get power though (but no data communication).
so , still an open issues and it will be really nice if u could consult the tech guys again.
thanks
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jgoggan
USA
330 Posts |
Posted - 27 mars 2006 : 20:53:51
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quote:
Originally posted by abumalik
David,
The required connection is RJ11 to mini USB.
The problem is that these are just physical connections -- not really related to the problem here.
The "required connection" that you want is serial to USB -- which is not trivial. As I said, you can't just connect wires and expect it to "just work" -- serial and USB are not compatible in that way -- you need logic in between to translate.
quote:
The offered solution of RJ11 to PS/2 does not solve the issue.
Most of the Holux GM-210 units actually has a PS/2-style plug on them. They then sell numerous end cables that plug into that -- including a USB-style plug (which includes the logic to translate from serial to USB within the cable).
Your Holux GM-210 appears to be different than that -- is that correct? It goes straight from the GPS to a USB connector without any connector in the middle of the cable, right? If so, is there a bulge in the cable between the GPS and the USB connector? If so, and you really, really wanted to make this work, you could just cut it off before the bulge and do a DIY cable.
If your unit goes straight to USB without any "bulge" in the cable -- then they are doing the USB conversion right in the GPS unit itself and you are likely out of luck unless you wanted to get a USB-to-serial adapter and convert it BACK into serial -- and then a DIY cable from that into your mount.
quote:
I have the same issue , i guess many have and don't really know why they chosen RJ11 connection on thier mount.
It's just a common standard connector that they then use to connect numerous devices that they have made cables for. For most people with a Holux GM-210, all they would have to do is unplug whatever is current connected to the PS/2 style connection and instead plug it into Seidio's PS/2 to RJ11 cable adapter.
quote:
I tried to DIY a mini USB to RJ11 but could not get my PDA to cummunicate to the GPS receiver. I managed to get power though (but no data communication).
Correct -- because they aren't directly compatible.
- John...
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Dell Axim X51v (WM5); Mapopolis (v4.x); SanDisk 512MB SD; Seidio G4500 Car Mount w/ wired Pharos button GPS |
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abumalik
2 Posts |
Posted - 28 mars 2006 : 18:51:45
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John,
First many thanks for an extensive reply. Second I have a small confession to make !!!. I forgot to mention that my devise is Holux GPSlim236 and not the GM-210 which was mentioned by the thread originator. Sincere apology. The device is at http://www.holux.com/product/search.htm?filename=gpsreceiver_bluetooth_gpslim236.htm&target=gpsreceiver00&level=grandsonson
Now , lets start again. I have the Seidio g2500 car kit with RJ11 female port. The GPSlim236 has a mini USB female. So I need an RJ11 male x USB mini male.
Theoretically this is possible. The RJ 11 on the SEidio G2500 made of 4 wires and the layout is described at http://www.seidioonline.com/index.asp?PageAction=VIEWPROD&ProdID=89
The wires are
1. ground
2. Rx (Receive data from PDA)
3. Tx (Transmit data from GPS)
4. Vcc (Power)
The Holux GPSlim236 mini USB wiring layout is also described in the manual from http://www.holux.com/product/search.htm?filename=gpsreceiver_bluetooth_gpslim236_xgxz.htm&target=gpsreceiver00&level=grandsonson
, page 11. I ignored pin 2 which is rarely used on USB connections ( I really don’t know what it does).
What did I do :
I sacrificed one USB cable by cutting it between the bulge and the mini USB pin (i.e. the bulge is left on the main cable and not part of the new DIY adapter). I also sacrificed an RJ11 cable and connected the wires. I plugged in my PDA (an I-mate PDA2K ) to the mount and connected the this DIY adapter between the GPS and the mount. I got power on the GPS which started charging. I then launched my Navigation software (MobileNavigator 5.1 from Navigon) and tried to connect to the GPS via wire. The software offered 2 ways to search for a an external wired GPS, one was fully auto and one was manual . I tried both but the GPS could not be found.
That’s the saga so far !!. Next I will try to locate the GPS via the GPSlim236 testing software (which my young daughter is hiding somewhere and the ransom I am offering is still not good enough!).
Meanwhile if anybody has done this rather odd connection before successfully then please chip in your tips. One thing I am still not sure about is the Tx and Rx wires. Most USB litriture refer to these wires as D+ and D- and I am not sure if D+ is equal to Tx or Rx.
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Edited by - abumalik on 28 mars 2006 19:57:47 |
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jgoggan
USA
330 Posts |
Posted - 28 mars 2006 : 21:14:55
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quote:
Originally posted by abumalik
John,
First many thanks for an extensive reply. Second I have a small confession to make !!!. I forgot to mention that my devise is Holux GPSlim236 and not the GM-210 which was mentioned by the thread originator. Sincere apology.
Ok -- good to know.
quote:
Now , lets start again. I have the Seidio g2500 car kit with RJ11 female port. The GPSlim236 has a mini USB female.
The GPSlim236 is a Bluetooth GPS with optional cables for connecting to other devices. They make several cables. Are you saying that you have the GR230-A2 "USB data cable" connected to it?
I think the issue is that Holux is mixing things up by using a MiniUSB CONNECTOR on their device. I do not believe it is actually USB output. You can tell this from the cables that they connect. Their USB cable requires logic in between the GPS and the USB output -- but their RS232 serial cable does not. Therefore, what is really going on is that their device outputs RS232 serial via the MiniUSB connector. It isn't really MiniUSB -- that's just the connector type they used.
quote:
So I need an RJ11 male x USB mini male.
To be honest, I think you'd be better off with their GR230-A1 "RS232 data cable" and then connecting THAT to Seidio's RJ11.
quote:
Theoretically this is possible. The RJ 11 on the SEidio G2500 made of 4 wires and the layout is described at http://www.seidioonline.com/index.asp?PageAction=VIEWPROD&ProdID=89
Yes, I am familiar with it -- but it expects NMEA serial data -- which isn't necessarily the same as USB output. So you need to convert from USB to serial with an adapter before you connect to the RJ11 port. That's what I've tried to explain above.
quote:
The Holux GPSlim236 mini USB wiring layout is also described in the manual from http://www.holux.com/product/search.htm?filename=gpsreceiver_bluetooth_gpslim236_xgxz.htm&target=gpsreceiver00&level=grandsonson
Yes, but you're missing something here. RS232 serial's transmit and receive is not the same as USB's transmit and receive lines. You can't just connect them together and have it "just work."
quote:
What did I do :
I sacrificed one USB cable by cutting it between the bulge and the mini USB pin (i.e. the bulge is left on the main cable and not part of the new DIY adapter). I also sacrificed an RJ11 cable and connected the wires. I plugged in my PDA (an I-mate PDA2K ) to the mount and connected the this DIY adapter between the GPS and the mount. I got power on the GPS which started charging. I then launched my Navigation software (MobileNavigator 5.1 from Navigon) and tried to connect to the GPS via wire. The software offered 2 ways to search for a an external wired GPS, one was fully auto and one was manual . I tried both but the GPS could not be found.
OK! Now we're onto something! This all makes sense now -- and you are SO close to having this work. YOu see -- the device, in my opinion (I am not a Holux expert) is output serial data through that MiniUSB port -- it isn't really USB. You are using the USB cable and that BULGE is actually converting the standard serial data into USB. So, by cutting it off AFTER the bulge, the cable is still converting the standard serial into USB -- and then you're trying to connect that to a device that expects standard serial.
My suggestion is that you cut the cable off BEFORE the bulge. You will then be able to wire the serial output from the GPS directly into the RJ11 cable -- and it should "just work."
Again, the confusion comes, I believe, from the fact that they are using a MiniUSB CONNECTOR, but it isn't really outputting USB.
Note that this is all "in theory" -- based on some assumptions from the pictures of the cables and such. Their "RS232 data cable" does NOT have any bulge -- so I therefore assume that the device is actually outputting straight RS232 serial data. But, I don't take responsibility -- I'm just tell you that, if it was me, I'd cut before the bulge and think it would work.
quote:
Meanwhile if anybody has done this rather odd connection before successfully then please chip in your tips. One thing I am still not sure about is the Tx and Rx wires. Most USB litriture refer to these wires as D+ and D- and I am not sure if D+ is equal to Tx or Rx.
Exactly what I think the problem is -- USB is not the same as RS232 serial Rx/Tx that we are used to and the Seidio expects.
This is why serial can do around 115200bps reliably -- and USB can do 480Mbps. :) They simply aren't the same thing at all really.
- John...
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Dell Axim X51v (WM5); Mapopolis (v4.x); SanDisk 512MB SD; Seidio G4500 Car Mount w/ wired Pharos button GPS |
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logicturnip
3 Posts |
Posted - 11 avr. 2006 : 15:34:50
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Hi
It seems that you have a similar problem to me, but mine is much more basic. I have a PDA mount too, but a bluetooth gps reciever. I have to use a splitter on my cigarette lighter to power both at the same time. The mount has an RJ11 output for a connection to a wired gps reciever. My PDA charges on 5v, and so does the bluetooth adaptor. I believe that the RJ11 outputs 5V to a wired GPS unit. I know that you can get cables that can power the tomtom bluetooth adaptor from this, but I have a Leadtek bluetooth gps unit( I cant remember the model, buts its that tiny one ) Anyway, the connecter to charge this is a mini usb. Im not that handy with a solering iron, so are ther any cables to bridge this connection available? I dont need any data transfer, so could easily bodge one together, but it would either be a nasty crimp, a dodgy solder, or a massive junction box! I could perhaps get an RJ11 crimper, and just crimp a mini usb cable onto it, but it doesnt really seem worth it. Any suggestions? Im sorry for the incoherency of this post, im inept at english!
Thanks
Andrew
Ive posted this in two threads, so if youve seen this before thats why. |
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admin_0
1 Posts |
Posted - 10 juil. 2006 : 14:08:07
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Hi!
I have also GPSlin236, and would like to hear if this wiring
USB/rs-323 is working?
Should usb-ps/2 adapters work? (those are for mouse and keyboars).
I am in that believe Holux is using usb connector, but rs-interface.
I would use gps with laptop w/o bt.
In car usb-hub is dividing power for gps and pda
Thanks |
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Scriggle
4 Posts |
Posted - 12 nov. 2006 : 08:57:00
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Hi
I think you will find that the output from the GPSlim236 is only at logic levels and this still needs converting to RS232 levels work reliably. Looking at the two cables, in the manual, the circuitry for RS232 conversion will be inside the 9 way 'D' connector, standard practice, and the only reason there is a 'bulge' in the USB cable is that there isn't the space to put it in either connector. There are many chips that will do the job, like Maxim MAX232, that only require a few capacitors around it to generate the negative voltages required in the RS232 spec. |
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Scriggle
4 Posts |
Posted - 12 nov. 2006 : 09:28:04
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Hi
Just one further note; it would pay to use the Maxim MAX3232 IC as this will work from the 3.6v supplied out of the GPSlim236 and has very low power requirements. This would require gaining access to pin 2 of the mini USB as standard USB does not use this pin. |
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Scriggle
4 Posts |
Posted - 12 nov. 2006 : 18:48:15
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Hi
I'm probably talking to myself here. Pin 2 I refer to is GPSlim's pin 2. Pin 2 on a standard mini USB is in fact D- (data negative)
The pinnings are as follows:-
Pin No........Standard Mini USB........Holux GPSlim236 (from their manual)
1..............VBUS (power).............GND (power and data return)
2..............D- (data negative).......VOUT (3.6v)
3..............D+ (data positive).......TXD (Data out, not USB or RS232)
4..............ID (not used)............RXD (Data in, not USB or RS232)
5..............Gnd (power)..............VCHARG (power)
However Holux have assigned the pin numbers incorrectly and are in fact reverse to that above.
So the following is true:-
Pin No.........Holux GPSlim236 (from their manual)
1...............VCHARG (power)
2...............RXD (Data in, not USB or RS232)
3...............TXD (Data out, not USB or RS232)
4...............VOUT (3.6v)
5...............GND (power and data return)
As you look into the connector of the GPSlim236, with the LEDs pointing up, then pin 1 is on the right. This is where it is confusing because they are refering to pin 1 as being on the left according to their table, but I suppose as it is NOT a USB connection they can enumerate the pins in any way they wish ... but it ain't standard. |
Edited by - Scriggle on 12 nov. 2006 18:52:29 |
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sal.fresco
Portugal
5 Posts |
Posted - 22 mai 2007 : 03:16:10
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Hi!
According to the "GPSlim236 Eng.spec E 031705.PDF" the GPSlim236 outputs serial data on it's mini-USB connector wich is not wired as a conventional USB port.
quote:
Compatible with Bluetooth devices with Serial Port Profile (SPP)
•Bluetooth™ version 1.1 compliant
•Bluetooth™ Class 2 operation (up to 10 meter range)
•Frequency : 2.400 to 2.480 GHz
•Modulation: FHSS / GFSK
•RF channels: 79
•Input Sensitivity: -80dBm
•Output Level: 4dBm
Output terminal: Mini-USB (TTL Level)
•NMEA Protocol Output : V 2.2
Baud Rate : 38400 bps
Data Bit : 8
Parity : N
Stop Bit : 1
•Output Format :
Standard : GGA, GSA, GSV, RMC,VTG
Optional : GLL, SiRF Binary
In face of this I think it's possible to homebrew an adapter with a mini-USB connector on one end and a 9 Pin D-SUB connector on the other.
Anyone want to comment this?
Regards
Sal
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If it does'nt work...
...try a bigger hammer! |
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USB GPS Mouse with G2500
