How to troubleshoot serial RS232 communications

You have not mentioned DTEs or DCEs. A DTE is a Data Terminal Equipment e.g. a PC or dumb terminal and a DCE - e.g. a modem or line driver etc - is a Data Communications Equipment. A DTE sends data on pin 2 and receives on pin 3. A DCE receives - yes receives - data on pin 2 and transmits data on pin 3. This means on a 25way connector a DCE will send data on pin 3 even though the designation of the pin is RxD. The reason for this is to do with the fact that a DCE is normally receiving data from a line system e.g. a telephone line and so the data that it sends out on the DCE interface is the data that it received from the line system. Many people make the mistake of thinking that you always need to cross transmit to receive but not when connecting a DTE to a DCE. So when connecting a DTE to a DCE you actually connect TxD on the DTE to TxD on the DCE and RxD on the DTE to RxD on the DCE.

Hello,
I"m using windows 10
After connecting RS-232 to usb
it it not showing any port connected
kindly help me to fix it

work for shifter g29 ?

I had prob which is the feedback is not the same. Example if puts "asdf" then the feedback will come out "asde". It is like near miss. I use rs232 cable solder with 9 pin female d sub connect to male d sub cable which has usb.

Tq dude for ur video ,solved my problem

THANKS ALOT BRO

Does this troubleshoot any serial communication or just with a specific computer/decide?

ask, what if i need rs232 to mini usb? what is needed to change from rs232 to mini usb? because most of those on the market are usb to rs232.

Thanks.

thank you so much , its working perfectly .
i have checked

Donu have a video on How I hook up this device to a proportional valve to and allan Bradley 1400

thank you

Can we check this in hyperterminal?

Why the USB adapter is seeing as a "mouse"...?? It is FTDI original on Win 7 ultimate... Thanks!

It's work, amazing. But I need to check with serial device to make sure the serial it's work..
But thank you

Thanks for the video, was helpful!

Здравствуйте Пожалуйста скажите Как прошивать тюнер Next Tango Plus com port rs232??

Wheres the jumper,?

hi
How can we check rts, cts,ri pins are connected ?

what is the windows O.S are  you using?

Paul, pardon the delay. You'd jumper pins 2 & 3 together at the end of the null modem cable. This jumpers Tx (transmit) and Rx (receive) together. If you can see what you're typing in the terminal window, you have control of the com port and have the correct port number selected. (It however doesn't tell you if the cable is null modem or straight through or not. But if you can't communicate to the product, then check the cable pinout.)

I'm having trouble understanding where to physically add the jumper wire.

I have the cables unlimited usb to serial adaptor and a null modem cable.

Where do I install the jumper without resoldering??