usb db9 cable

[ritesh]

hi

 

i want to make controller base gsm project.

 

but i want to load program at home. i have laptop and its windows 7 32bit system

 

how to check the my usb db9 serial cable is working or not. i have hl 2303 cable.

 

plz help me.

[D.V.G. Krishna]

after connecting the cable to PC

right click on my computer

“devise manager”

there you will find the usb to comport

 

if it is not there there mustbe a problem with the cable

try to update the driver

 

which microcontroller you are using

if you want to use 8051 i preffer to use P89V51RD2 microcontroller which can be programmed through serial cable just a MAX232 is required

 

in case of  AVR microcontrollers,all AVR mcu’s can be programed through serial port(DB9) use “ponyprog”. the programming cable is very simple to make

 

all the best

 

[AJISH ALFRED]

 

Hi Ritesh,

Follow the steps mentioned by Krishna in his post. Further more I suggest you to download and install any terminal emulator like Teraterm, Putty, Mtty etc. and try the loop back test.

Just connect the cable, open the emulator, set the baud rate and all, in connect option give the same port number which you’ve seen in the device manager.

Now short pin2 and pin3 of db9 connector by any means. If you are getting the same letters in the emulator screen which you’ve typed, means your cable is 100% working.

[ritesh]

dear krishna sir,

 

i use p89v51rd2 but i dout my cable is not working.

 

if i make usb db9 cable at home then it is require for driver?

 

how can i problem solve of driver.?

[Amrith]

Hi Ritesh,

Making USB to DB9 cable at home is not a good idea because if you need this cable to work you need suitable drivers installed on the operatin system(windows7 or XP). Better get an good quality USB to DB9cable from the market & install the corresponding drivers which come along with the pack. Before getting it, confirm the supporting operating systems with the seller. 

[Anonymous]

sir

 

   i have a usb to db9 cable i can able to load the program in P89V51RD2 but i not able to send proper data from  hperterminal to my gsm module and i have check by shorting pin no. 2 and 3 of db9 that time i got perfect data……but when i connect my gsm module to db9 that time it not give proper data like a simbol..and i have make the all the bound rate same but inspite of this i am not gettinf proper data..

pleae sir help me…..

 

my no.9016347670

ID: [email protected]

[Amrith]

Hi Friend,

I’m sure that there is no problem with the USB cable. Can you post a Screen Shot or picture of hyper terminal data that you are receving from GSM modem when connected.

Important Note: Take care that you are connecting Tx pin of GSM module to Rx pin of DB9 serial cable & Rx pin of GSM module to Tx pin of DB9 serialcable.

[rakesh namani]

hi friends

i tried to connect usb cable to db9 connector,i dont know is it correct or not. and i used this to connect my nokia 3500c mobile with pc.but i did not get any response on hyper terminal.when i tried to send AT commands,the text is not displayed on the hyper terminal

plz help me

 

 

[AJISH ALFRED]

Hi Rakesh,

Please explain your connection with the help of a diagram.

[Author]

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