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Old 10-07-2008, 02:27 AM   #1
tenkasian
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Pl2303 usb to serial recevies but does not send....lsmod, dmesg ok


Dear all,

I have a kermit connection running between a laptop and desktop.
The laptop is connected to a Prolific PL-2303 USB to serial adapter. One end of a null modem cable is attached to this adapter, and the other end is connected to the serial port of the PC.

I ran the following commands:

find /lib/modules -name *2303*
/lib/modules/2.6.9-67.ELsmp/kernel/drivers/usb/serial/pl2303.ko
/lib/modules/2.6.9-67.EL/kernel/drivers/usb/serial/pl2303.ko

--------

/sbin/lsmod | grep 2303
pl2303 18757 0
usbserial 30121 1 pl2303

-----------

dmesg | grep tty
ttyS0 at I/O 0x3f8 (irq = 4) is a 16550A
usb 6-2: PL-2303 converter now attached to ttyUSB0

---------

Everything seems fine . I conenct the 2 computers using kermit. I can receive on my laptop from the PC, but I cannot send from the laptop to the PC.

Both computers run RHEL4. I even tried replacing the RHEL4 laptop with a laptop running Fedora 9 .... same problem.


Any help will be appreciated.

Thnx & Regards

R
 
Old 10-08-2008, 10:58 AM   #2
TB0ne
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Quote:
Originally Posted by tenkasian View Post
Dear all,

I have a kermit connection running between a laptop and desktop.
The laptop is connected to a Prolific PL-2303 USB to serial adapter. One end of a null modem cable is attached to this adapter, and the other end is connected to the serial port of the PC.

Everything seems fine . I conenct the 2 computers using kermit. I can receive on my laptop from the PC, but I cannot send from the laptop to the PC.

Both computers run RHEL4. I even tried replacing the RHEL4 laptop with a laptop running Fedora 9 .... same problem.
Those USB/serial devices usually work well, and 'just work'. Are you sure the cables/connectors are good? Since you've tried a different computer, that would rule out the hardware, kernel module, and other such things that could cause a problem....
 
Old 10-10-2008, 03:55 AM   #3
tenkasian
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Registered: Oct 2008
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Original Poster
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Quote:
Originally Posted by TB0ne View Post
Those USB/serial devices usually work well, and 'just work'. Are you sure the cables/connectors are good? Since you've tried a different computer, that would rule out the hardware, kernel module, and other such things that could cause a problem....
The same setup works in windows using the same cables. That validates the hardware. The problem i face (can receive but not send) is only in Linux. Given our stiff deadline, this is turning into a major hassle that might force us to change our production environment to windows. I hope somebody from the community can help.

Thanks

R
 
Old 10-10-2008, 09:05 AM   #4
tenkasian
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Registered: Oct 2008
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Old problem to new problem

I just saw my hyperterminal settings on windows, and flow control was none. So i punched in set FlOW NONE in kermit and it did the trick!

Thanks all
 
  


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