Originally Posted by Keenan
Are you sure that some of the pins on your current cable are not jumpered at or right near the termination point of the cable, possibly creating those 5 points of connection that apparently are needed?
Also, I'm not clear, have you tried a new/fresh straight through serial cable and it has not worked? I ask as they can be purchased for as little as $5 USD.
The cable was bought brand new in a shop here. I didnt built that one myself. So yes the 3 pins are soldered right, i can confirm those:
RX, TX and GND.
I'm 100% sur that CTS and RTS are essential for the VPxx to communicate with a Terminal/computer (if the document provided above is reliable course!) I'll have to try to build it first, test the cable, and I'll tell you if that's okay.
No I didnt tried any other cable because it's hard to find it rapidly, and I don't want to waste more time waiting for another cable that probably won't work.. There are so much DB9 diagrams out there that I prefer to build the cable myself and tweak around until I have found the issue. Also this way allows me to understand my hardware and share info that MIGHT ( ^^ ) interest someone who's having the same issue.
However i'm looking around me if I could borrow a cable from a friend .. unfortunately it's old and used for specific tasks, not for consumers.. Therefore hard to find. Keenan can you strip out one of your cables for me ? One that works for an update ? Or anyone who has a working cable for updates ?
To simple check if your cable is communicating right: (if you don't want to strip out the original cable)
1 - Go to your Bios and check that port COM1 is set to 3F8 – 3FF / IRQ4
2 - On Windows = > Go to device manager > Check port COM1 > Baud Rate @ 57600 > Flow control set to "Hardware"
3 - Launch Tera Term Pro. Click on Setup > Terminal > Transmit must be set to "CR+LF"
4 - Click on Setup > Serial port and check that Baud rate is set to "57600" and Flow control is set to "Hardware"
5 - Turn on your VPxx > go to configuration > Serial Port Rate > set the value to 57600.
6 - Save confguration on the VPxx and turn it off. Let Tera Term opened.
At this point Tera Term, your Vpxx and your computer are all three ready to communicate properly.
7 - Connect your Serial cable to your PC and VPxx.
8 - Launch the Bootloader Menu on the VPxx by holding down the menu button while pluging in the AC adapter on the back of your VP.
This operation will launch a bootloader menu on Tera Term.
9 - You may think at this point that your cable is working and you're ready to go.. but for me my cable was lacking of some wiring to tansmit the update data. (example : you have to press "h" to launch the update sequence, but I can't do anything and my keyboard is fully working)
Best thing to do from here if you have an old firmware would be to press "h" and update your VP. If the update succeed please send me a diagram or a photo of the pin connexions of the working cable you used.
If you have an Updated VPxx, a simple Reset would be a great proof (that your cable is better that mine ! ^^). So just try the Reset Sequence and tell me if this works. If the data is properly sent from Tera Term then your VPxx should reset as expected.
Thanks a lot.