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[Lcdproc] Ricavision VFD USB module

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  • From: petr at (Petr Palacký)
  • Subject: [Lcdproc] Ricavision VFD USB module
  • Date: Fri, 17 Dec 2010 09:41:44 +0100

Hi Markus,

thank you for your answer.

I tried to modify the file "mdm166a.c" for matching right vendor/product ID
(13ec:0030) but with no success.
LCDd start successfully and with no errors reported, but VFD display does not
show anything than built-in clock.
I think we can be close but probably communication protocol may be different
than which is used in Futaba's mdm166a.

I tried to search more info about my VFD module and I found that this VFD
module (CWT-7046 V08) was produced by CWTek ( - I
sent them a request for communication protocol... (still no answer, I do not
know if I will be successfull).

Also I found that this VFD looks identically like Futaba's "DM-140 GINK" (see
image: but with no
buttons, icons on the sides are exactly the same.
Better photos of my VFD (CWT-7046) can be found here:

I tried to modify vendor/product IDs in file "dm140.c" (source code of
lcdproc-0.5.2 modified by Henrik Larsson with support for "dm140" can be
found here:
but still with no succes...

... LCDd ending up with error:

# /usr/local/sbin/LCDd -c /usr/local/etc/LCDd.conf -d dm140 -f -r 5
Server running in foreground
Listening for queries on
driver_load(name="dm140", filename="/usr/local/lib/lcdproc/")
Allocating memory for framebuffer[0]

Allocating memory for framebuffer[1]

Device for Vendor[13ec] Product[0030] was not found, exiting

Driver [dm140] init failed, return code < 0
Module /usr/local/lib/lcdproc/ could not be loaded
Could not load driver dm140
There is no output driver
Critical error while initializing, abort.

Is there any other solution on how to make work CWT-7046 with Linux?

Thank you for any help
Petr Palacky

On Wednesday 15 of December 2010 21:32:39 you wrote:
> On 15.12.2010 16:03, Petr Palack? wrote:
> > Hi guys,
> >
> > I have bought one of "Ricavision VFD" display connectable via USB but i
> > am not able to playing with it under Linux. I found that this VFD module
> > is designed for Win MCE (probably only?). After connecting +5V to the
> > modul, VFD shows clock in format hh:mm:ss.
> >
> > Because Ricavision company is gone, I have no support nor full module
> > name. On module board is text: "CWT_7046 V08".
> > Display controller chip is brushed so I can not read its part number.
> >
> > You can see product image here:
> >
> >
> > After connecting I can see that two new USB device were detected ...
> >
> > 05e3:0608 and 13ec:0030
> >
> > ... but no USB-serial device was created.
> Hi,
> at a first glance on the pictures linked to above I thought it is this
> device: especially as it appears as a
> HID device as well (note it will not create serial devices in this case).
> Looking at it a second time I see it has different icons around.
> You may try with the 'mdm166a' driver, if you modify the
> 'HIDInterfaceMatcher' (mdm166a.c line 144) to match your VendorID /
> ProductID (13ec:0030).
> Regards
> Markus


S pozdravem
Petr Palacky

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