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Anyone got DVL serial port details?
https://forum.lddb.com/viewtopic.php?f=23&t=8046
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Author:  happycube [ 24 Sep 2018, 15:07 ]
Post subject:  Anyone got DVL serial port details?

DVL players have an internal control port - substance had/has a player with a serial board. If the pinouts and voltages were known a USB serial adapter could easily be made.

Anyone got details on what ribbon, pinout, and voltages are used? And if the control params only work on the DVD side? Thanks.

Author:  elahrairrah [ 25 Sep 2018, 16:32 ]
Post subject:  Re: Anyone got DVL serial port details?

I could be wrong, but I would imagine that that port is for firmware updates.

Duncan at Bayview Electronics (before he went rogue) did a firmware update for a DVL-700 that I sent him for work, and it made the comb filter in it adjustable.

Author:  blam1 [ 25 Sep 2018, 17:51 ]
Post subject:  Re: Anyone got DVL serial port details?

This is a 7 pin connector on the DVDM board CN106 and is listed as RS232C, so it "should" comply with standard serial protocols and voltages. It's on the edge of the board between the two cables that go down to the CLDM board.

1 - NC
2 - GND
3 - +5v
4 - CTS
5 - DTR
6 - RXD
7 - TXD

One of my 919E boards has a little fob in this port that makes it region free. If I remove the fob, the player reverts to its original region coding.

Author:  simoni [ 27 Sep 2018, 13:26 ]
Post subject:  Re: Anyone got DVL serial port details?

Just a thought, but if you connected that 'fob' to a serial to USB adapter (a TTL level one like the arduino's use) and connected it to a PC, then connected the +5V, it would fire up and you could read out the commands it's using to do the region free trick... then you could publish the codes required here (or make more dongles and sell them as gold bars :) ).

Either way you would then know the serial speed/settings and at least a few of the available commands.

Author:  dandu [ 28 Oct 2018, 16:30 ]
Post subject:  Re: Anyone got DVL serial port details?

I'm interested, i want to try a thing with LaserDisc and Macintosh, and i need a model with serial. And i have a DVL-919E

Author:  vintagepc [ 08 Nov 2018, 04:08 ]
Post subject:  Re: Anyone got DVL serial port details?

I too am interested in this serial dongle; I'm trying to get my USA 919 to play some region 2 PAL DVDs I have... Blam1, any chance you have an oscilloscope with serial port decoding to grab the commands from it?

I did find this interesting little tidbit in the service manual, but changing that link had no effect for me... I tried it in combination with the 909 solder bridge and the usual DISPLAY remote trick to no avail.

Attachment:
919.png
919.png [ 31.16 KiB | Viewed 594 times ]


I also did try a serial-to-USB cable wired to that port, no luck either. I was hoping it might output something but it does not appear to, I see no signs of any activity with an oscilloscope.

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