RS232 to TTL Converter Module MAX3232 – C.B.Electronics
DFRobot RS232 to TTL Adapter - RobotShop
RS232-TTL Module
Amazon.com: NOYITO TTL to RS232 Module TTL RS232 Male Female Mutual Conversion Module Serial Level Conversion to SP232 TTL Serial Port Communicates with RS232 Level Device 15KV ESD Protect (Female) : Electronics
Amazon.com: NOYITO TTL to RS232 Module TTL RS232 Mutual Conversion Module Serial Level Conversion to SP232 TTL Serial Port communicates with RS232 Level Device : Electronics
DEBO RS232 TTL: Developer boards - RS232 to TTL, MAX3232 at reichelt elektronik