megajolt v4 computer connection problems

nicksuper6 · Post by **nicksuper6** » Sat Jul 25, 2009 4:27 pm

Just fitted new v4 power on light shows connect with computer using instore lead.Nothing it cant find it no matter how i try.Cant test for hyperterminal,because do not know what port i'm in on computer.It is not a laptop its a home pc,dragged into garrage.Do i need a driver with in store lead,i was running v3 configurator.Dont think that makes a difference.Would a rj45 to rj11 lead b better.
Nick

cng1 · Post by **cng1** » Sun Jul 26, 2009 7:11 am

What do you mean by a instore lead? Does the cable have an RJ11 on one end and a DB9 serial connector on the other end or is it an RJ11->RJ11 lead that you are using with an RJ11->DB9 converter?

We've seen a couple of people recently see an RJ11 on the back of their PC and an RJ11 on the V4 Megajolt and have simply connected the two together. Unfortunately the RJ11 on their PC is for a modem and isn't a serial port at all!

Post by **brentp** » Sun Jul 26, 2009 9:09 am

Hi Nick,

From your description it sounds like you're having a problem identifying which COM ports your computer has.

See this part of the operation guide for checking your configured serial ports, by opening up Device Manager in windows:
http://www.autosportlabs.net/MJLJ_V4_Op ... erial_Port

Device Manager should tell you what com ports you have installed- one of those should get you connected using the software.

Let us know if you make progress!

nicksuper6 · Post by **nicksuper6** » Sun Jul 26, 2009 11:06 am

I am using a rj11 to db9 converter.What do you use at trigger wheels.I'm based in uk.Thing is i'm fitting the v4 megajolt to a freinds car,i have a v3 what orks fine

Post by **brentp** » Sun Jul 26, 2009 4:22 pm

Hi Nick,

It looks like you are trying to plug the MJLJ into the RJ45 port of your computer as Chris suspected? That RJ45 port is actually a network port- you actually need to plug the MJLJ into an RS232 serial port available on your computer.

We sell a ready-made cable here:
http://www.autosportlabs.com/rj11-seria ... -p-43.html

However, you may be able to quickly build your own cable using a re-purposed telephone cord and DB9 connector from an electronics parts store:
http://www.autosportlabs.net/MJLJ_V4_Op ... al_Adapter

If your computer does not have a built-in RS232 serial port, you will need an adapter. We have a guide for this here:
http://www.autosportlabs.net/USB-serial_adapters

We hope this helps and we apologise for the confusion!

cng1 · Post by **cng1** » Mon Jul 27, 2009 3:21 pm

nicksuper6 wrote:I am using a rj11 to db9 converter.What do you use at trigger wheels.I'm based in uk.Thing is i'm fitting the v4 megajolt to a freinds car,i have a v3 what orks fine

Hi Nick. An RJ11->DB9 should work fine. If you have been using a v3 on your PC previously is it possible that you are using the V3 configurator rather than the latest V4 software?

If you can't get it figured out let us know an we can take a look at the ECU and/or the cable.

Chris

nicksuper6 · Post by **nicksuper6** » Mon Jul 27, 2009 4:14 pm

Cheers Chris I will load the v4 configurator on my daughters good laptop then follow Brent's link.I am using a rj11/db9 just hope it doesn't need a driver for the lead because I didn't get one with it.
Nick

cng1 · Post by **cng1** » Mon Jul 27, 2009 4:20 pm

RJ11->DB9 adaptors are entirely passive devices, no drivers necessary. DB9->USB adaptors on the other hand do need drivers in most cases.