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It is possible to use a hdmi cable to control a CNC?
The parallel ports are disappearing (laptop)
It is possible to use a hdmi cable to control a CNC?
hdmi is for video, so no.
the cable itself has 20 conductors, so it could beused for lots of stuff.
the problem with most pc protocols these days is they are high speed serial, and are not ideal for controling things in real time with sychronisation.
There Are Already using the USB controllers, Something That was recently dismissed because of latency.
Maybe someone is thinking Interested in HDMI solution.
usb is used by taking the whole pulse generation and putting it on an outside card, which in turn has its own parallel port.Originally Posted by marcomartim
i dont see how you could use hdmi though as its a one directional video protocol designed to drop off information if it lags behind.
even if it did work, it would offer no advantage to usb.
The latest version (HDMI 1.4) supports bidirectional Ethernet connections up to 100 Mbps (HDMI Ethernet Channel - HEC).
I do not know if it would be possible to implement this idea.
Hugs
well, then you could just use ethernet. ethernet is widely used for cnc communication. the hitch though is the same as with usb, you need an external pulse generator with its own parallel port for it to be reliable as ethernet is not a real time protocol.
my solution for the antiquated parallel setup - while keeping inexpensive - is using an arduino board ($60) and implementing a pulse generator on that. then the pc control just has to feed it instructions.
basically a smooth stepper, but it could be cheaper and open.
It was precisely the compatibility of HDMI with Ethernet, that led me to consider using for CNC.
The more options the better, and maybe getting cheaper.
I appreciate your answers.
but the hdmi cable is redundant. all its doing is taking your ethernet card and routing it through the one cable. great for home theatre routing, pointless for cnc.
a parallel card is $20. any external motion generator will be 10x that price and offer few if any advantages.
There is a reason for me to find another alternative.
I use an old laptop (p4) with the parallel port to drive my CNC, works very well.
Recently bought another laptop (I5) with no parallel port and no card reader (PCMCIA).
I would use this laptop or other compatible model to drive my machines.
I'm interested in ethernet or usb (which I'm researching enough), but this topic is about looking for another alternative possibility in HDMI connector because it is a very present in most modern laptop.
Hugs.
HDMI is extremely high bandwidth, but also not really well suited for driving long distances. Most every laptop still is produced with an ethernet port and that does not seem to be going away like parallel ports have. It would likely be a less expensive solution to go with ethernet, though USB should be able to be made to work if iissues with latency could be addressed. I have not looked into the details myself, so I don't know what the *EXACT* problem with using USB is so can't really speak to it.
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