Dual RS232 converter has 2 RS232 female ports and TTL pins extended using berg pins.
Very useful for Debugging DWIN Projects.
One end can be connected to DWIN RS232 T2 and R2  and other end to PC through RS232-USB cable.
Jumper connections at TTL pins :
TX1--RX2
TX2--RX1
Power required for this module is 5v.
 
While connecting to Arduino you can directly connect Rx1 to Rx ,Tx1 to Tx ,
5v & Gnd can be taken from Arduino.