Ludlum model 2221 Scaler/Ratemeter SCA with Top loaded RS-232 adapter for GPS use-Like new – CHP Consultants – Products and Health Physics Related Services
GT-321R-RS232 - *** Discontinued *** GPS Receiver with RS 232 port - CellularAccessories - iComTech
Amazon.com: Geekstory CP2102 6 in 1 USB-UART Serial Adapter Module USB to TTL 485 232,TTL to 232 485,RS232 to 485 + 4P Dupont Cable Jumper Wire Female to Female, for Windows, Linux,
Beitian BN-80D GPS+GLONASS Dual GPS Module 5V Input RS-232 Level W/ 2m Cable for RC Drone FPV Racing