Something I never had to deal with. Reminds me of the time I tried to decipher the one-wire serial signal of Sony Ericsson walkman phones that were used for complex add-on devices, from about 15 to 20 years ago. Flow control should be implicit too. There is something to be said for the potential to moot baud rate and word format issues. You could use two chips that implement the CDC protocol that ignores the baud rate set on the USB side, but use a standard and very high baud rate over the isolation barrier.
That would mean using a microcontroller and a software implementation of CDC. Very doable, but just buying the Cypress Semi chips is vastly more convenient.
We had side-by side machines on each network with something like this in between as the only link. The files moved over the serial link via an old-school serial file transfer program running on each machine. And, indeed, there are still Linux and FreeBSD drivers that can be used with those chips to make point-to-point network interfaces. I went with CDC for this use because I specifically needed them to be serial ports for my application.
So yeah, good idea. I would be tempted to have the two sides connect via ethernet so files can be transferred faster. Also appreciate the comments around isolation. Probably better than my strategy of just using an old cheap laptop :. Worst case you can do a bit of piping and use cat.
Worked as advertised, but 1 gig of data moves really slow over USB 1. Not many people had home networks then, and wifi was pretty exotic and still as slow as USB, so I thought I was pretty slick.
But I would have thought the shield on the USB cable would have balanced that before the internal pins connected, no? Reading between the lines, it sounds like you used TP Ethernet. The magnetics that are on each end of the TP line offer galvanic isolation, so you were good. Not sure what you mean.
It was a diy ethernet crossover cable. Twisted Pair. Got it. The ground potential question was only referring to the USB cable. The ADUM provides 2. Both parts provide 12 Mbps of data throughput per direction. I am going to experiment with a similar chip to replace the optoisolators.
You may have missed the comment where I pointed out that in my particular application I must use CDC instead of double-bulk-pipe style devices. Very cool. In which case, a single cable between the two computers would give the same result. In this particular case, the manufacturer recommended two USB serial dongles with an RS null modem, but I came up with a consolidated design.
I posted that on Twitter and to my surprise there was a lot of interest. If isolation is what we need, I believe a pair of USB to Ethernet adaptors can achieve the same thing at much higher speeds, since Ethernet endpoints are magnetically coupled. Upon reading your reply to other comments, I realise that your requirements are quite different.
Anyways great project! Despite the alternatives, it definitely makes senses why one would need an isolated serial null modern. I designed one similar about 7 years ago and it is currently still sold and used by the company I worked for. Not a new concept. Yes, mine is optoisolated as well. What about this? Just have one person sit in a room looking at a screen displaying the data from the first system to be transferred in hex.
That person uses a flashlight to blink out the data using morse code. There is another person in another room watching for the light flashes that enters the data into the second system using voice to text.
Oh, wait, you said this was a thing you did to solve a specific problem with a work thing that you just shared because it was interesting. And, gosh you guys, all the other comments related to floating grounds and live laptop chassis were all very scary to read. I had no idea that all electronics are so poorly designed that even looking at them funny will let the smoke out AND electrocute me.
I will never, never, never again look at two electronic things funny at the same time. Laptops as mentioned are only grounded on the AC side of the supply, not on the SELV side , you only need to look at the headphone type Jack to see the continuity to earth ground is lost. Grab your old school VOM lol aka multimeter. Such a gadget has been available by His store has sales from time to time.
Got this one instead and the unit works great! In order to serial rs adapter usb 2. We will find the rs port in a usb to get. Buy standard usb cable usb to rs cables. Built-in static protection protects the usb to serial adapter against high voltage spikes created either by static electricity or by surges in the supply voltage. One dte device talks to one dce device, or to one other dte device through a null-modem cable a null-modem cable is a cable where the transmit and receive lines are crossed.
Please refer to the wavestar users manual for complete instructions on that products use. The z-tek zea usb 2. Related searches, ftdi usb cable uport db9 rs converter ftdi converter rs rs pl rs pci to rs uart to usb metal sniffer rs usb mac rs tester converter rs rs com to usb to usb convert voltage cable length com ftdi usb. Rs allows you to connect to a modem that is not on your desk, but the one next to it, even if you have to run the cable high enough that people can walk under it.
The icusbf 1-port usb to serial rs adapter cable with ftdi chipset and com retention converts an available usb 1. The standards to kbps or less and line lengths of 15m 50 ft or less but today we see high speed ports on our home pc running very high speeds and with high quality cable maxim distance has increased greatly. The rs to rs itself, regardless of what model you choose, is simply a device which can convert standard rs data signals into rs signals and vice versa.
If you have been in computers for a while then you will know that selecting the right rs serial cable can be a problem. These cable can take a variety of forms in terms of the physical methods used for construction as well as the number of connections that are incorporated within the overall rs cable.
Most rs to rs converters can convert data in both directions, from rs to rs and from rs to rs, this is also called a bi-directional converter. Many devices with a convenient and transmit lines are computer use. We will feature rs issues regarding installation. The rs norm defines a one-on-one communication link between dte device data terminal equipment, such as a pc or a printer to a dce device data communications equipment, typically a modem.
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