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USB/RS232 Prolific PL2303

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Gonchar

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prolific rs232 driver

I have problem with PL2303.
I have made USB/RS232 cable by original schematic.
When I use chip from the original cable my cable works correctly.
When I use new chips there is no transmited data from USB to RS232.
However the reading from RS232 to USB is present.
RS232 outputs are in tristate.
ShutDown output (pin12) is high.
I don't use external memory. SCLK and Data pins are pulled up.
I think chip is in suspend state. Why chip is in suspend state?
 

pl2303 schematic

Hi,
Just an idea, if you cable is sold in high qty-es by its manufacturer, it is possible to use custom pl2303 chips (usb vid and pid already programmed in ic), thus elliminating the need for external 93Cxx memory for usb information. Also, the drivers may be bounded to that vid and pid. If you install a new chip, with other vid and pid, usually don't work. Try to reinstall the drivers, or try to use the downloaded drivers from www.prolific.com.tw with the new chip.

/pisoiu
 

prolific usb to rs232 driver

Hi, friend
I think you can use the following chip
FT232BM. The datasheet has some schematics which will help you.
 

pl2303 problem

Thanks a lot. :wink:
I'd prefer try to use this type of chips.
I have next question.
Can I program my USB chip?
What I have to do for this? (programer device, software etc..)
What vid and pid I must to program into chip or maybe external memory?
Where I can find drivers that will support my device?

I supposed that chips supported with standard drivers from original manufacture :cry:
 

pl-2303 schematic

Gonchar said:
Can I program my USB chip?
What I have to do for this? (programer device, software etc..)
What vid and pid I must to program into chip or maybe external memory?
Where I can find drivers that will support my device?
Click to expand...

You can't program Prolific ICs. They come with pre-programmed USB functions. The only thing you can change is their VID and PID (+ some simple IC settings), because they are stored in the external serial EEPROM (search EDAboard forums or Google for free simple serial EEPROM programmers). Check Prolific support page at h**p://tech.prolific.com.tw/ for last drivers, schematic and application notes.
 

pl2303 max232

I am not familiar with pl2302 but intersting in your problem, your mention that it received ok but rs232 driver in tri-state when transmit (concluded vid/pid is good), as i known some usb/serial chip like ftdi support transmitter enable function (for half-duplex comm. like rs485), try figure this point.
 

prolific usb rs232 driver

An example (with soft) in french of an interface USB-RS232 with FT232BM chip here:
**broken link removed**
 

pl2303 circuit

Where can i get the schematic and circuit diagram for the Pl2303.

On their support site they don't have the schematic, only data sheet.
 

pl-2303hxd schematic

sky2004 said:
Where can i get the schematic and circuit diagram for the Pl2303.

On their support site they don't have the schematic, only data sheet.
Click to expand...
Already uploaded here:
PL2303 and PL2313 Schematic files include ORCAD files and PDF files.

Just use EDAboard's search function to find info.
 
usb rs232 prolific

:( I can´t find the PL2303 Shematic. I need it for a new desing.
I prefer this chip beacause I have one for a comercial cable.
 

pl-2303 problem

JoseA said:
:( I can´t find the PL2303 Shematic. I need it for a new desing.
I prefer this chip beacause I have one for a comercial cable.
Click to expand...
You can't see attachments before you have made your first posts.
And since this was your first post, you couldn't see the attachment before.
Can you see it now JoseA?
 

pl 2303 schematic

PL2303 schematics here i come :)
 

pl-2303 схема

I ever meet this problem before.
If you didn't use EEPROM, you also need to put PULL UP resister.
Then it can work correct.

gook luck for you !
 

rs232 converter driver prolific

i can't find the attachment files could you please upload them again

Fire in the Wire :idea:
 

profilic rs232 driver

Does anyone know the value of the L1, L2, L3, L4 ferrite beads in PL2303 schematic ?
 

pl-2303 max232

I can suggest you to use FT232Bm for USB to RS232 conversion.
It makes your work easier.
 

prolific usb to rs232

trungnl said:
This is the Prolific Schematics.
Hope you successful with this chip.
Click to expand...
I can't download it.
 

prolific usb rs232 drivers

I have a USB/serial cable, but it does not work. How can i do?????? I tryied many driver but......:-<<
 

pl2303 chip

I have a PL2303 CONVERTER and have installed the drivers for it. When i check the converter by shorting Rx and Tx terminals through hyperterminal i get back the letters typed . But when i connect with the microcontroller i get dummy characters .

i have connected in the following manner

USB--->PL2303---->MAX232---->MICROCONTROLLER

SHOULD I TRY BY TAKING OUT THE MAX232 AS I AM NOT SURE WHETHER PL2303 OUTPUT IN TTL OR RS232 STANDARD.
 

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