CP2102 USB to TTL Serial Adapter Module USB to RS485 232, TTL to RS232 485, RS232 to 485 + 6Pin Cable F/F for Arduino Nextion Display SIM7000A Board

This CP2102 USB to TTL Adapter is very easy to use and setup. I've been using this TTL adapter to communicate with older flight controllers that have a broke off USB port. It was very easy to get setup and working. I really like that it has the pins already broken out and comes with one pin cable as well. It has been working great for me so far.

I will recommend this product it is a very good balance between price and quality. It just work

I have purchased several of these for different testing situations. They have worked perfectly.

This thing gets unbelievably hot! It does work, but it gets so hot that I wouldn't want to leave it running unmonitored. Fire hazard!Spend a few more bucks and buy something else. I will not buy this again.

I had some high hopes for this dongle, since it appears to be able to do something very interesting. It can speak both RS232 and RS485 at 5V or 3.3V, AND can act as a bridge for hardware without needing a computer or a USB port. This would mean I should be able to put a TTL RS232 device on a standard 485 bus just by jumpering some wires and making it so. Sadly, I couldn't even get to the point of testing that functionality.First off, the package comes as shown, with no documentation. If you want to know how to set the dip switches, print this page now. Your package will have no documentation talking about them.My initial test for any device like this is to plug it into a standard ESP chip and program it via serial. Simple RS232 at TTL, low voltage. The device did this without a problem. I then went to unplug it, and now have small welt to show for my effort. Because two of the chips (the SiLabs chip on top, and the Max3232 chip on bottom) were hot enough to burn me. Not just "oh, those are warm", but "ouch, oh... that left a mark" hot.I figured maybe it's just something off with the RS232 circuit. So after it cooled off, I switched it over to RS485 and plugged it back in. Again, both chips got swelteringly hot in about 15 seconds. Doubly odd, since with the USB to 485 setting, one would think the Max3232 chip wouldn't even be enabled, right?Per a discussion on EE stack exchange this is apparently a rather common issue with the Max3, and especially cheap knock-off chips (not by TI). If you don't properly put resisters on the IO pins and/or improperly leave some of the pins used for special features ungrounded, it can cause it to oscillate internally and grow very hot. This would appear to be the case here. The TI chips have internal pull-downs for these pins, where knock-offs sometimes don't. I even tried tying the RS232 RX/TX to ground to see if it prevented thermal runaway, but that did not fix things.As for the Silab chip, I'm not sure why that's getting hot, but it is. Not a hot as the Max3232, and not as quickly, but it is overheating just sitting idle.Given the fact that this device is heating up rapidly on power-up, to a dangerously hot level, I'm afraid it's pretty much useless. I can't in good faith rate this with anything more than one star.The manufacturers should double-check their chip sources, and maybe have a second run at proper design based on the specs for the chip (including properly pulling unused pins to VCC or Gnd as needed, and putting resistors on the RS232 RX/TX lines per the chip manufacturers spec.

Please listen to the other reviewers for this product when they tell you that this device is a fire hazard. With their warnings in mind, I took the chance and plugged it into my computer. Within 10 seconds, the onboard chip became too hot to touch. I immediately removed it and won't risk trying to flash anything with it.Please be careful.

Same experience as the other reviewers here in that it immediately starts to wildly overheat. Quite disappointing and I'm not going to experiment with it further.

Just what I needed. Will connect to your raspberry pi as well as the 9 pin serial on an old pc. Versatile little beast.

I bought this as I needed TTL - USB serial. It worked perfectly right out of the box - no configuration needed (except setting the power jumper on the board).

I was lucky, the more expensive modbus adapter I purchased before this one was lost in shipping, so then I found out the other adapter sucks compared to this cheap one that has lots of extra functionality. Dang!

The product was reasonably priced and shipped quickly. Very happy with this transaction.

It works exactly as it's supposed to except it's missing the rx LED. It was clearly never soldered to the board so I don't know what happened. Since I'm going to have to hunt down a similar LED and then fight to solder the tiny thing to the board without it flying away, I'm going to have to give 3 stars.There needs to be better quality control.