Null usb adapter

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COM retention allows the same COM port number to be automatically assigned each time the serial adapter is connected to a USB port on your system or your system is rebooted. Without COM Retention, you would have to remember which port to connect the adapter.

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How can we improve the information on this page? All Rights Reserved. Model Number:. Select this model number. No models found matching your request. Go back Start Over. Serial Number Cancel Submit. Another offender is electric blankets: they capacitively couple to you, and if you reach out to touch a grounded object or a partner not under the blanket, you get a tingly feeling in the fingertips.

Especially to said partner. Vengeance shall be mine! You Americans got the nice end of the deal. It become more of a problem for a high frequency SMPS. Since OP did not specify the cause of the voltage, I do not try to make any non-safe assumptions.

If there are sufficient current tohave sparks, then it is more than tens of uA. The operating frequency of the SMPS is irrelevant, since that frequency does not appear on either the line or the output. SMPS are relevant here only because they usually require much more filtering on their AC input lines than their linear brethren, so typically have much more capacitance between line and chassis ground.

The SMPS operating frequency has nothing to do with that. The leakage current is redirected current from EMI filter common mode choke and Y caps back to Earth ground. I have done my share. The one my friend has a Earth connection and the leakage current flowing into the Earth causes the unbalances that trips the GFI.

These pesky devices are required in new home construction. They attempt to detect arcing and flip when they sense a wave on the line that looks like arcing. Anything that puts the frequency and characteristic that looks like arcing on the line will trip the bastards. A crummy switching wall wart will do it.

I had to build a filter for the AC plug line by looping it through a ferrite ring 6 or 7 to stoop the nussance flipping. So very few know the issues associated with ground potential. This is an age old problem in electronics that date as far back as the tube era. Today this is exassorbated by laptops and wiring to electrical outlets, breaker boxes and variations in XO grounding.

As for the USB issue. It is complicated by a laptop to laptop or desktop. Presently there are no methods of ensuring both devices are subject to the same ground potential. The Optoisolator is the most eloquent solution to this problem. This is brilliant. And just in time for Thunderbolt 3 and 4. Where transfer speeds can reach as high as 40Gbps. Even having a 3 prong laptop power supply is no guarantee your laptop itself will be grounded.

I measure no continuity from the negative output to the power supply ground. Seems like a handy thing to have in a toolbox, just in case. Apple computers with Firewire had the ability to boot as an external drive and network over Firewire, both of which should definitely have been standard features in USB. Better yet, my iMac has the ability to act as an external display over displayport — which should be a feature in HDMI-connected AIOs and botebooks, imo. Have you tried using your iMac as a DisplayPort-display?

It a hardly-supported mode and only works with a handful of Apple-computer on the other end of the cable. It was intended to allow you to make use of the very nice display in an iMac once the iMac itself was getting old. Given that my 10 year old imac is Only now nearing replacement but still has more poke than my new windows laptop , that was probably over engineering…. FireWire was peer to peer. So if at least one of the two ports being connected together with a typical e.

Thanks to this, USB has been as useful as it was. Nowadays it is becoming more simplified then ever, but back in the days…. You can make a fairly nice one of these from a couple of cheap serial adapters and jumper wires, you probably already have everything you need just lying around the junk pile. No blocked ports, no firewall issues etc. Oh yeah dialup-bbs-tnc-gateway to internet you appreciate the value of a fast and ready null-modem in best form available, wars get won that way and shiat, ]:o great project….

I believe they route the data through the network stack vs this design being two serial ports. Both would have advantages in certain applications. If you really want to transfer data this way you are much better served by two USB to Ethernet adapters and a cat5 cable, also solves the electrical isolation issues nicely.

They bypassed the transformer and connect directly to the chips. The chip blew up when I move it directly to the USB port and the higher than expected voltage closer to 5V blew up the chip.

If only they actually used a zener and diode. Not to say that the tolerances and proper loading of the zener diode would be done properly either. That being said, a pass transistor can be had for 3 cents, and a real requlator for a dime so yeah, you should probably use better regulation in a real design. Well the thing died after becoming so hot the plastic case started to droop.

I did it because I had a specific application where I needed serial. Ahh, the joys of asynchronous serial communications. So many ways for it not to work. I used to have a box full of null modem adapters for different applications, plus some that had pin breakouts for custom wirings. No support for Mac OS, no support for Linux, etc. 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.