I have got a PL-2303 chip based USB to Serial Converter. I found the pinout of male RS232 and it showed that pin 2 = RD, pin 3 = TD and pin 5 = GND. So according to the guide above the pinout of P1
9 7 5 3 1
A 8 6 4 2
2 - Rx
3 - Tx
4 - Vcc (+3,3V)
5 - GND
I soldered the USB to Serial Converter pin 2(RD) to the router pin 3, the USB to Serial Converter pin 3(TD) to the router pin 2 and the USB to Serial Converter pin 5(GND) to the router pin 5
and finally I bridged R355 and R356.
Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)
I don't get connection! _________________ TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
Last edited by toto2700 on Wed Nov 24, 2010 19:08; edited 6 times in total
Yes, I know that homepage but thanks for your help.
I'm sorry if I wasn't clear about the pinouts. Maybe this sketch will help you understand what I did there.
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)
Posted: Sun Oct 31, 2010 16:31 Post subject: Re: TP-LINK TL-WR841ND v3.0 Bricked! Help me!
I figure my problem is the USB to Serial Converter. I measured 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9). I don't understand why not 3.3V or 5V. My Siemens M35 cellphone data cable landed in the trash years ago. It would be great right now because it used 3.3V.
So I need to find the right TTL converter which is suitable for RX - TX - GND - +3.3V communication.
If I have any progress I'll let you know.
fyi2000 wrote:
toto2700 wrote:
Set up Putty to 9600 8-N-1 and NO flow controll (COM1). (115200 8-N-1-N didn't work either)
Could it be COM3? Check it with Windows device manager.
My USB to Serial Converter is based on Prolific 2303HXD. Why isn't my USB to Serial Converter working? And why I measure 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9) instead of 3.3V?
(I'm really sorry if I'm asking stupid questions but I'm totally new to these things like unbrick routers, get serial access to the router) _________________ TL-WR1043ND v1.7 Openwrt
TL-WR841ND v3.0 Openwrt
TL-WR741ND v1.9 Openwrt
Getting serial console is pretty standard fare. You need a MAX323 or similar level-shifter. The pinout on the router is RX - TX - GND - +5V (Power connector)
No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial. _________________ Kernel panic: Aiee, killing interrupt handler!
My USB to Serial Converter is based on Prolific 2303HXD. Why isn't my USB to Serial Converter working? And why I measure 6.38V between the pin 3(Transmit Data) and pin 5(Ground) (RS232 DB9) instead of 3.3V?
When did you get that USB to Serial Converter? How does it look like?
How do you connect it to the board?
Take a photo so we can see how you did it.
BTW, use a multimeter to measure the voltage of Vcc, Tx and Rx of the serial console and check if Tx varies while power the router on.
No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.
No it is not different - all the routers are using 3.3V TTL level signals.
You can not use the USB<->Serial cable that you buy in the computer shop, that one has RS232 signal levels.
You need a cable intended for TTL serial and not RS232 serial.
