5Pcs MAX3232 DB9 Connector RS232 to TTL Converter Module RS232 Serial Port To TTL Converter Module
Working Voltage: 3V-5V
MAX3232 Chip
Pin definition: GND,RXD,TXD,VCC,+5V
When use the plate, must be VCC external 3.3V or 5V power supply, power LED lights on, the module will work! No external power supply, LED lamp is not bright, the module will not work.