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gatsoman Occasional Visitor
Joined: Mar 05, 2004 Posts: 3
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Posted: Fri Mar 05, 2004 9:07 pm Post subject: Serial comms quirk... emap and Axim X5 |
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Heres one that leaves me tearing my hair out....
I have a Dell Axim X5 with Tom Tom Navigator 2 running, along with a Garmin Emap.
When I plug my Emap into my PC and view the Emaps Nmea strings on Hyperterminal I see them.
When I plug my Axim X5 into my PC (with its serial cable), with a Hyperterminal type program running, strings can be sent back and forth from X5 to PC and PC to X5.
Thus, cables are fine, equipment is fine.
When I plug the X5 directly into the Emap (both running Nmea at 4800) the X5 does not see the strings on Hyperterminal or on the Navigator software.
Heres the quirk.... I captured a packet of the Nmea data in Hyperterminal on my PC, and copied it to the clipboard. I then plugged in the X5 and spat the strings back out at the X5. The X5 saw them and thought that it was receiving the data - I saw the Nmea in Hyperterminal, and Tom Tom Navigator 2 thought it had aquired satellites.
All I can think of is that the Emap is not providing handshaking, power or something else for the X5 to be able to see the strings.
Any thoughts???! |
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Dave Frequent Visitor
Joined: Sep 10, 2003 Posts: 6460 Location: UK
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Posted: Fri Mar 05, 2004 9:31 pm Post subject: |
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Dell's are notorious for handshake issues with ActiveSync trying to grab the connection if no other app is listening. I'd make sure you:-
1. Start GPS software/Hyperterminal equivalent on PPC
2. Power on GPS
3. Then connect the two together
It may not help much, but Dell's do have a problem and you have to do it in this order otherwise you may not get data come through the com port or it can hang. |
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gatsoman Occasional Visitor
Joined: Mar 05, 2004 Posts: 3
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Posted: Fri Mar 05, 2004 9:54 pm Post subject: |
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Thanks for the speedy reply Dave but still no joy..
Thinking about it, the fact that I can send a packet from Hyperterminal (emulating Nmea data) which the PPC interperets correctly rules out a ActiveSync problem in this case, but I have had the same thing you describe happen with other apps!
I'm wondering if the PPC is expecting a handshake on the RS232 - the Garmin only provides TX, RX and Ground. What I may try is shorting pins 7+8 out on the 232 cable to try and fool the PPC into thinking it has a handshake. Lets hope I don't blow it up! |
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gatsoman Occasional Visitor
Joined: Mar 05, 2004 Posts: 3
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Posted: Fri Mar 05, 2004 11:54 pm Post subject: |
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OK all, now solved my only problem after a bit of hardcore surfing...
All you need is:
Garmin Emap/Etrex etc
Emap cable (Garmin->9pinD)
9pin D Gender Changer
9pin D Null Modem
Axim Cable
Axim
Sellotape
Plug 'em all in, then cut a tiny bit of sellotape to cover one of the pins on the Emap plug - the first one in the bank of 3 pins, next to the plastic seperator.
This cuts the Emap 'recieve' line and enables comms.
Thanks for views and speedy replies, hope this comes in handy for someone some time. |
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Pc-Mobile Frequent Visitor
Joined: 26/10/2002 10:38:36 Posts: 789 Location: Hong Kong
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Posted: Sat May 22, 2004 3:00 am Post subject: |
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gatsoman wrote: | OK all, now solved my only problem after a bit of hardcore surfing...
All you need is:
Garmin Emap/Etrex etc
Emap cable (Garmin->9pinD)
9pin D Gender Changer
9pin D Null Modem
Axim Cable
Axim
Sellotape
Plug 'em all in, then cut a tiny bit of sellotape to cover one of the pins on the Emap plug - the first one in the bank of 3 pins, next to the plastic seperator.
This cuts the Emap 'recieve' line and enables comms.
Thanks for views and speedy replies, hope this comes in handy for someone some time. |
Or get a simple Axim>eMap cable from our site. _________________ Pc-Mobile
http://pc-mobile.net/gps.htm |
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