Thursday, April 15, 2010

RS485 to RS232 converter

http://aquaticus.info/rs485_to_rs232

Popular chip MAX232 is used to convert RS232 signals from/to TTL level. MAX485 converts TTL level signals to RS485 standard. RTS line is used to change transmission mode of MAX485. RTS signal is first converted to TTL level by MAX232 then connected to DE and RE/ pins.

Centos 7 reset root/ any user lost password / lockout due to cant remember password

1. Need to be in front of the terminal. (Physically if not vm). 2. Reboot the server 3. Press 'e' in the GRUB2 boot screen. 3. bunch...