Prolific Pl2303 Usb Serial Rs232 Converter Pcba Adapter Module - Pc Hardware Cables & Adapters - AliExpress
FTDI USB TO RS232 module PCBA DB9 pin industrial PC interface conversion | eBay
cp2102 usb rs232 adapter usb b to db25 rs232 pcba adapter board for bar code printer cable - Price history & Review | AliExpress Seller - SINFORCON Company Store | Alitools.io
FTDI - USB-RS232-PCBA - IC DEVELOPMENT MODULE USB-RS232 5V USB-A PLUG PCB, USBmadeEZ-UART Series - RS
Wholesale RS232 Protocol Pcba Lock Board With SIM 4g Usb Serial Port Ethernet Port Module One Stop Circuit Board Pcba Service Hdi Pcb From m.alibaba.com