Arduino can't read data from router's serial port

Projects Networking, Protocols, and Devices
5

My router has 3,7 V on UART so i decied to use MAX3232 to convert to 5V TTL levels.
After i checked port by reading router's boot log by terminal program (9600,8n1) on desktop PC with physical rs-232 COM port. Everything is readed fine!

Hmmm... 8)