I am trying to connect Raspberry Pi ver 2 with my PC using UART.
Connection of my board is
Raspi Tx -> Rx RS232toUSB PC
Raspi Rx -> Tx RS232toUSB PC
Raspi GND -> GND PC
Problem I am facing with this is while I send "+" using picocom on Raspi it gives me output "j" on teraterm
Also I want to connect it to Xbee S2C module
Raspi Tx -> Rx Xbee
Raspi Rx -> Tx Xbee
Raspi GND -> GND Xbee
Raspi 3.3v -> Vcc Xbee
With using it on Picocom giving input of "+++" for 3 or 4 times it gives Output of "K".
While using with Breakout board og Xbee it works normally.
Please help me to determine problem with Raspi UART
Is max3232 IC required between interface?
Thanks in advance