topic Re: USB A connectors in Tech Help - Software/Hardware etc

USB A connectors

penneck — Fri, 06 Feb 2026 20:05:08 GMT

What is the difference between a USB A Type 2 connector and a USB A Type 3 connector?

I am trying to connect my wife's camera which has an HDMI interface to her laptop which has a USB A Type 2 interface, but the best solution I have found so far seems to be a cable that has a USB A Type 2 Male connector at one end and a USB C Socket at the other, plus another cable that had a USB C plug connector at one end and an HDMI connector at the other.

From what I understand of USB, a USB A Type 2 connector and a USB A Type 3 connector apparently differ by the Type 3 having an extra pair of contacts. Is that correct? If it is correct can I use a Type 3 plug in a Type 2 socket, without doing some damage?

Is my solution too simple? Do I have to take into account something else, in which case what?

Thanks for any help.

Re: USB A connectors

Baldrick1 — Fri, 06 Feb 2026 21:24:34 GMT

USB2 and USB3 ‘should’ be interchangeable despite the extra cores in the USB3 version. Have you tried just using the one cable? You won’t damage anything.

The extra cores in the USB3 is used to increase the potential bandwidth of the cable.

Re: USB A connectors

HPsauce — Fri, 06 Feb 2026 21:38:30 GMT

@penneck Honestly, I don't think an HDMI port can connect to USB in any useful way with "dumb" cables, you need an "active" adapter of some sort to convert the signals. They will often take power from the USB port.

Loads of devices available to buy for beer money, so check you exact requirements and Google for options.

What is it you're actually trying to do, what sort of data are you hoping to move from what to what?

e.g. HDMI is typically used to carry continuous live video signals, whereas USB copies finite data files or fixed size images.

Re: USB A connectors

Baldrick1 — Fri, 06 Feb 2026 21:46:05 GMT

@HPsauce

My reading is that @penneck is successfully transferring data using a USB 2 extension plugged in to a USB 3 to HDMI cable. So all that is happening is that the USB2 to USB 3 interface is happening at the cable junction.

Re: USB A connectors

PhilipHeyes — Sat, 07 Feb 2026 09:21:09 GMT

The OP omits to mention what they are trying to do i.e transfer files or stream video as a webcam !

Reading the Camera's PDF copy of the full manual would be far safer than having forum members speculate.

Re: USB A connectors

Baldrick1 — Sat, 07 Feb 2026 09:33:27 GMT

If the OP is currently successfully transferring data using two cables in series, then where's the speculation? The question becomes one about USB2/3 caompatibility

Whilst they should be compatible, I have come across one instance where a USB 2 device would not work when plugged into a USB3 PC input,, hence 'should' work.

Re: USB A connectors

HPsauce — Sat, 07 Feb 2026 10:11:42 GMT

@Baldrick1 "If"! @penneck says "I am trying" so probably NOT successfully. 🤣

Re: USB A connectors

PhilipHeyes — Sat, 07 Feb 2026 10:34:26 GMT

For file transfer I pop the SDXC cards out of the camera and use a Lexar USB 3 Memory Card Reader.
UHS-II cards & readers can exceed 120 MegaBytes per second, handy on bulk transfers.

The OP mentions USB and HDMI, on (our) Nikon cameras these have two distinct functions.

1) USB : File transfer to / from either SDXC card or if supported, use the camera as a Web Camera or remote control.

2) HDMI : Send live Video & Audio to an external monitor during video recording or playback video / audio to a TV etc.

Re: USB A connectors

penneck — Sat, 07 Feb 2026 11:26:49 GMT

@PhilipHeyes , @HPsauce & @Baldrick1

Actually gents I haven't tried to do this transfer, I was looking at ways to do it, starting with the problem of connecting the camera to the pc. First I was trying to find out if a Type 3 USB A connector will plug into a Type 2 USB A socket without damaging anything.

Second, there was the confusing situation where HDMI cables have a USB C connector at one end, and some of these cables have what looks like a block at the other end with, I assume, a converter inside it, but not a cable to connect to the camera. Other HDMI cables end in hopefully suitable connectors for the camera with maybe a block part way along their length (does this block contain a converter? who knows). To add to the confusion, some HDMI cables state they are adapters and some do not. If I need the first of those two HDMI cables (the one that ends at the block), then do I need a third cable to complete the camera to pc connection or not?

Hopefully, you are not as confused as I am

Re: USB A connectors

jab1 — Sat, 07 Feb 2026 11:32:02 GMT

@penneck Exactly which camera is it and what are you actually trying to do? Sorry if you have said previously, but answers to those two questions may simplify things.

Re: USB A connectors

PhilipHeyes — Sat, 07 Feb 2026 12:23:17 GMT

HDMI cables have a USB C connector at one end

These are one way cables used to connect to from a laptop's USB port to a Projector or TV or Monitor's HDMI input.

i.e. only for : Laptop >>>> USB to HDMI adaptor cable >>>> TV Screen

Re: USB A connectors

penneck — Sat, 07 Feb 2026 12:54:55 GMT

Hello John,

The camera is a Panasonic DC-FZ82.

I'm assuming my wife is trying to download the photos from the camera to her laptop

Cheers

Graham

Re: USB A connectors

penneck — Sat, 07 Feb 2026 13:01:27 GMT

Hello @PhilipHeyes

I didn't notice anything in the adverts on these cables that they were one-way, so thankyou for making me aware of that. As I wrote in my reply to jab1, I'm assuming my wife wants to download the photos from the camera to her laptop, which makes that cable wrong for what she wants to do. On the other hand, why would anyone want to load anything onto a camera?

Regards and thanks

Re: USB A connectors

MisterW — Sat, 07 Feb 2026 13:09:38 GMT

@penneck looking at the manual for the DC-FZ82, the HDMI connection is only for viewing videos. The camera has a USB-C connector for connecting to a PC to download photos.

See page 233 of the manual

Re: USB A connectors

jab1 — Sat, 07 Feb 2026 13:09:12 GMT

@penneck wrote:

Hello John,

The camera is a Panasonic DC-FZ82.

I'm assuming my wife is trying to download the photos from the camera to her laptop

Cheers

Graham

If you/your wife merely want to transfer/copy the pictures to a computer, then the easiest way is to do by removing the card from the camera, and use a card reader. Saves all the 'cable' questions and potential issues.

Re: USB A connectors

Dan_the_Van — Sat, 07 Feb 2026 13:11:01 GMT

@penneck

An AI search suggests the two ports are

Micro-USB (USB 2.0): This is the primary port for data transfer to a computer. Crucially, this model supports USB charging, meaning you can charge the battery while it is inside the camera using a power bank or wall adapter.
Micro-HDMI (Type D): Used for connecting the camera to a TV or external monitor to view your photos and 4K videos. Note that it does not support clean HDMI out for advanced live streaming setups.

This agrees with the Panasonic camera I own, it's slow but the USB cable which might have been included with the camera can be used.

Buy a SD card reader and use that to copy data across

Re: USB A connectors

HPsauce — Sat, 07 Feb 2026 14:41:39 GMT

@penneck A very brief AI search produces:

The Panasonic Lumix DC-FZ82 (or FZ80/81/83) features a Micro USB 2.0 port for data transfer/charging and a Micro HDMI (Type D) port for video output. It supports wireless photo transfer via Wi-Fi and connects to PCs as a plug-and-play USB mass storage device.

So, RTFM would be my first advice, to confirm the above. And ignore HDMI as others have also inferred.

Secondly, if correct why not just RTFM and transfer via Wi-Fi?

The camera may well have been supplied with a suitable USB cable, Micro USB to USB2, which will work fine in a laptop USB3 port (usually with a blue strip). If not, buy one, job done.

Re: USB A connectors

penneck — Sat, 07 Feb 2026 15:16:11 GMT

I've just managed to download the user manual for the camera. It put up a fight and took 3 or 4 attempts but its here now.

I have also managed to get my wife's camera and charger. The camera charger socket also has the USB symbol next to it, so my wife telling me to use the HDMI appears to have been an unintentiional wild goose chase. However, at least I know which way to go at the caera end. The charger has a detachable cable which at the mains end is a black USB A connector (not white or blue). It turns out it doesn't have the capability to do data transfers so I guess that is why it is black. It also means I cannot use it for connecting the camera to a pc so I need to buy another cable.

However, I am still at the point where I dont know if a USB 3 plug will connect to a USB 2 socket, and work, without causing a problem. My understanding of the difference between USB 2 and USB 3 is that USB 3 has two extra data contacts. Am I wrong about those extra contacts?

Thankyou all for your help

Re: USB A connectors

PhilipHeyes — Sat, 07 Feb 2026 15:35:26 GMT

Stop the circles about USB 2 vs 3 sockets.
Does the USB plug fit is the only question that matters.

I am very surprised the supplied USB cable does not perform file transfers.
Have you even tried it ?

Does your laptop have a slot for reading an SD card ?
if it does just pop out the memory card from the camera.

Re: USB A connectors

jab1 — Sat, 07 Feb 2026 15:27:13 GMT

@penneck wrote:

However, I am still at the point where I dont know if a USB 3 plug will connect to a USB 2 socket, and work, without causing a problem. My understanding of the difference between USB 2 and USB 3 is that USB 3 has two extra data contacts. Am I wrong about those extra contacts?

Thankyou all for your help

YES - A USB3 'plug' will fit a USB2 socket - but will perform at USB2, not USB3, speeds - which you can safely ignore for your purposes.