Configure PuTTY to serial conection USB-Serial to flash a router

Installing and Using OpenWrt
1

Hi.

I have a problem when try to connect mi laptop to a router serial port.

I supose must to use three wires: RX, TX and GND from my bridge USB-COMx Prolofic

I configure PuTTY 57600, 8, n, 1, none to use COM8, but when connect the power on, only see this:
PuTTY screen unreadable

Anyone can help me about configure PuTTY to understand this screen?

Regards.

2

The usual speed is 115200.

3

Hi.

I tried 115200 bps, but the result is tha same, wrong characters.

The bootloader from OpenWrt configure the connection, and tftp client, doesnt?

Regards.

4

Make sure the ground on your adapter is connected to the router board's ground plane. Do not connect the 3.3 volt or 5 volt power wire. Try all the bauds from 9600 on up. The baud rate has to be known beforehand, it does not autoconfigure. The bit pattern is almost always 8 N 1 but again that does not autoconfigure.

What model of router is this?

5

Hi.
The router is Samknows Whitebox V8.

This is the PCB layout for serial port:

Como conectar al puerto serie J2 de la PCB SK-WB8

I solded 2,3 and 4th pines to my bridge USB-COM Prolific.

6

Do you have the proper TTL Serial voltage adapter that converts your computer's 5 Volt serial to the router's 3 Volt serial connection???

See post #4 here: [solved] Can't connect even when in failsafe mode - #4 by lleachii

and others regarding the TTL adapter.

7

you used rs232 usb
need USB TTL
I used before rs232 get the same problem !
but with USB TTL is work Good

8

Hi Marlowe,

Did you manage to fix the putty connection? I get the same unreadable messages in putty with two routers, an Edimax and a Netgear. And only connecting Tx to Tx and Rx to Rx. When using crossed connection, Rx to Tx and Tx to Rx the putty window remain black. I use a FTDI232 usb to ttl interface.

I've tried all kind of setting in putty but without success. Did someone have any ideea?

Thank you,
Sadang

9

Hi again,

I managed to fix it myself. There were two issues: first was a faulty ftdi232 module (even with loop test I have all characters echoed), and second an incorrect baud rate. After I changed the ftdi232 module and find the right baud rate (115200, N,1,1) everything worked fine... till I tried to load openwrt and after reboot the router remained totally dead. But for this I'll try to open a new post.

10

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