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Thread: Earthmate USB to Serial cable

  1. #1
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    Earthmate USB to Serial cable

    Hi,

    I have received several e-mails asking about the serial cable.

    This is my experience with this cable:

    Ask the technical service of Delorme for to construct myself the cable and this was the answer.

    De: Brian Riendeau
    Fecha: 10/14/03 20:45:17
    Para: 'jose*****@******.com'
    Asunto: RE: Email Support Site Form


    Hi,
    The GPS does not output anything that is compatible with a standard
    serial connection regardless of how you wire it. It outputs a binary data
    stream per USB specification. The USB to Serial adapter cable actually has
    a microchip built into it that converts the binary data to an output that
    can then be routed down a serial cable for use with PDAs and other devices
    that require a NMEA 0183 compliant signal and have no USB port.

    Thanks,
    Brian


    After this answer I went to Delorme's page and buy the serial cable but
    I had an error and they sent the cable to me for a PDA ( palm m500 ).

    I live in Spain and for me the shipping charges are more expensive than the cable.

    Then i open the cable and surprised I donīt saw any microchip. Look up the pins
    Of the connector of the PDA and translate them to a connector of the serial port.

    The cable is working perfectly with 5 meters length.


    And this is the wiring of the cable:


    Cable USB GPS Delorme Earthmate


    Conector GPS Conector USB


    1 ----------------------- 4 - USB - GND

    2 ----------------------- 3 - USB - DATA +

    3 ----------------------- 2 - USB - DATA -

    4 ----------------------- 1 - USB - + 5 VDC

    12 malla ---------------- masa conector (shield)




    Cable Serial GPS Delorme Earthmate


    Conector GPS Conector D9 Hembra (D9 female)

    1 - 9 ------------------- 5 - GND

    4 ----------------------- 1 - + 5 VDC interior PC cable rojo *

    5 ----------------------- 3 - <- TXD

    6 ----------------------- 2 - -> RXD

    7 ----------------------- 4 - <- DTR

    12 malla ---------------- masa conector (shield)


    * Power supply from inside of PC (hacked). When you switch on the PC you
    have main power and the GPS start to seeking satellites.

    - Use the USB cable for reference for the pins of the GPS.
    - For me is working perfectly whith any GPS software. I donīt use
    the software supplied with the GPS (USA) because i live in Spain.


    Sorry for my english!
    Car: BMW 320 TD (Compact E-46 2002)
    Motherboard: VIA Epia M10000
    Display: Lilliput 7" from DIGITALWW
    Power Supply: Opus Solutions SFX-12-15
    GPS: Delorme Earthmate USB with serial cable
    Software: XP pro, MediaCar, Mappoint, Destinator2

  2. #2
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by New_Compact
    Hi,

    I have received several e-mails asking about the serial cable.

    This is my experience with this cable:

    Ask the technical service of Delorme for to construct myself the cable and this was the answer.

    De: Brian Riendeau
    Fecha: 10/14/03 20:45:17
    Para: 'jose*****@******.com'
    Asunto: RE: Email Support Site Form


    Hi,
    The GPS does not output anything that is compatible with a standard
    serial connection regardless of how you wire it. It outputs a binary data
    stream per USB specification. The USB to Serial adapter cable actually has
    a microchip built into it that converts the binary data to an output that
    can then be routed down a serial cable for use with PDAs and other devices
    that require a NMEA 0183 compliant signal and have no USB port.

    Thanks,
    Brian


    After this answer I went to Delorme's page and buy the serial cable but
    I had an error and they sent the cable to me for a PDA ( palm m500 ).

    I live in Spain and for me the shipping charges are more expensive than the cable.

    Then i open the cable and surprised I donīt saw any microchip. Look up the pins
    Of the connector of the PDA and translate them to a connector of the serial port.

    The cable is working perfectly with 5 meters length.


    And this is the wiring of the cable:


    Cable USB GPS Delorme Earthmate


    Conector GPS Conector USB


    1 ----------------------- 4 - USB - GND

    2 ----------------------- 3 - USB - DATA +

    3 ----------------------- 2 - USB - DATA -

    4 ----------------------- 1 - USB - + 5 VDC

    12 malla ---------------- masa conector (shield)




    Cable Serial GPS Delorme Earthmate


    Conector GPS Conector D9 Hembra (D9 female)

    1 - 9 ------------------- 5 - GND

    4 ----------------------- 1 - + 5 VDC interior PC cable rojo *

    5 ----------------------- 3 - <- TXD

    6 ----------------------- 2 - -> RXD

    7 ----------------------- 4 - <- DTR

    12 malla ---------------- masa conector (shield)


    * Power supply from inside of PC (hacked). When you switch on the PC you
    have main power and the GPS start to seeking satellites.

    - Use the USB cable for reference for the pins of the GPS.
    - For me is working perfectly whith any GPS software. I donīt use
    the software supplied with the GPS (USA) because i live in Spain.


    Sorry for my english!
    Well, AFAIK you can't convert USB data to serial without some sort of Chip/software to control it, so I'd say that you have a serial GPS mouse (otherwise why pins 5-9 etc?) that is converted to USB and by wiring to the pins you have you are by-passing the USB conversion! I may be wrong here!

    But well done for finding that!

    By the way, what area are you in? We're skiing next week at Sierra Nevada, woo hoo!

  3. #3
    Newbie
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    Spain
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    Quote Originally Posted by Laidback
    By the way, what area are you in? We're skiing next week at Sierra Nevada, woo hoo!
    Hi,
    I live close to Barcelona. Normally I go skiing to Cerler ( Huesca's Pyrenees ).
    In this season I have 20 days of ski.
    Car: BMW 320 TD (Compact E-46 2002)
    Motherboard: VIA Epia M10000
    Display: Lilliput 7" from DIGITALWW
    Power Supply: Opus Solutions SFX-12-15
    GPS: Delorme Earthmate USB with serial cable
    Software: XP pro, MediaCar, Mappoint, Destinator2

  4. #4
    MySQL Error MatrixPC's Avatar
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    Can you explain a little clearer I mean pin to pin connection?
    Delor USB pin ------ Serial pin
    1 --------------------??
    2 --------------------??
    3
    4
    5 GROUND
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  5. #5
    Variable Bitrate rgardjr's Avatar
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    Quote Originally Posted by MatrixPC
    Can you explain a little clearer I mean pin to pin connection?
    Delor USB pin ------ Serial pin
    1 --------------------??
    2 --------------------??
    3
    4
    5 GROUND
    I'll try and help. If you're asking about which USB pin goes to which Serial pin-it doesn't work like that. If you have a newer earthmate, you can see that the end of the cable that plugs into the GPS receiver has 12 pins. With a USB cable 5 of these pins are used. To use the GPS via serial 7 of these pins are used. The two cables use the same pins for power, gound and shield, but that's where it ends. The GPS data to and from the receiver is transferred using different pins because of the difference between the two standards. Can you make a serial cable by cutting up a serial cable and the Delorme USB cable-maybe. If the Delorme USB cable has wires going to all 12 pins than it's as easy as finding the wire that goes to pin 1 in the Delorme cable and connecting it to the wire that goes to pin 5 on the serial cable. You'd just follow the pinout that New_Compact provided:

    Delorme Serial
    Pin Pin
    1----------5
    9----------5
    4----------1
    5----------3
    6----------2
    7----------4
    12--------Shield

    I haven't cut open the USB Delorme cable, but I'm guessing that there might not be wires running to those pins used for the serial operation. I bought the serial cable from Delorme for $35 and it has worked perfectly to solve my hibernation problem that I had with the USB cable and USB to serial drivers. If you do cut open your Delorme USB cable, let us know if the wires are there for the serial pins.

  6. #6
    Constant Bitrate kalito's Avatar
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    has anyone try this as well? if so.. can you tell me if it works or not... thanx in advance.

  7. #7
    Variable Bitrate rgardjr's Avatar
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    Quote Originally Posted by kalito
    has anyone try this as well? if so.. can you tell me if it works or not... thanx in advance.
    I'm pretty sure that New Compact has done this. Here's the original thread:
    Earthmate not compatible with Mappoint
    My only concern would be that the USB cable that comes with the Earthmate doesn't have wires running to the serial pins on the plug which would complicate the needed splicing quite a bit.

  8. #8
    Constant Bitrate kalito's Avatar
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    Talking

    can someone tell me if the image is correct or is it the opposite way
    Attached Images Attached Images  

  9. #9
    Raw Wave Laidback's Avatar
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    Quote Originally Posted by kalito
    can someone tell me if the image is correct or is it the opposite way
    http://www.hardwarebook.net/connector/bus/usb.html
    http://www.hardwarebook.net/connector/bus/usb_tech.html

  10. #10
    Raw Wave rando's Avatar
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    How to make a serial cable for the USB Earthmate

    I just did this (from information posted elsewhere) and it works. It's true, the GPS to USB cable DOES NOT have all the wires you need to get a serial connection. But, if you look close at the GPS end of the GPS/USB cable, you will see that the connector is easily disassembled with a couple of clips. Once inside, all 12 pins are exposed and more than long enough to solder the extra wires you need. I will post pics of this when I get home.

    Here is what I did to test it out. I plugged in the USB cable to the GPS and to the computer so that i would get power and ground. There were no drivers installed on this machine ... I'm only doing this to get power and ground. Next I loaded up hyperterminal and pointed it to com1/4800/8/n/1. Finally I plugged in a serial cable to com1 and shorted pin 2 (READ) to pin 6 on the GPS. I immediate began receiving the GPS data stream below.

    $Version 231.000.000ES-01501
    $TOW: 0
    $WK: 1192
    $POS: 6378137 0 0
    $CLK: 104538
    $CHNL:12

    $Baud rate: 4800 System clock: 24.553MHz
    $HW Type: S2AM
    $Asic Version: 0x23
    $Clock Source: GPSCLK
    $Internal Beacon: None
    $LED Flash rate : OnTime: 0 , OffTime: 0
    $GPGGA,235948.000,0000.0000,N,00000.0000,E,0,00,50 .0,0.0,M,0.0,M,0.0,0000*77
    $GPGSA,A,1,,,,,,,,,,,,,50.0,50.0,50.0*05
    $GPRMC,235948.000,V,0000.0000,N,00000.0000,E,0.00, 0.00,091102,,*1E

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