... 3.3v logic level VCC,GND,TXD,RXD sampling workable Bluetooth TTL module3.3v logic levelVCC,GND,TXD,RXDAbout Sinforcon ... RJ45 cables, USB RS422 cables, USB Parallel cables, USB to Audio cable. The chips are availavble for PL2303, CP2102, FT232RL, ZT213 ... . SP485, MAX3232, CM119, etc. These products are widely used in POS terminal applications, serial mouse, modem, router cotrolling, data acquisition ...