USB to rs232 converter, RS -232 to rs-485, RS 232 to USB adapter, rs232 programming

 ICL3221 Series 250 kbps 15 kV RS232 5.5V Transmitter/Receiver - TSSOP-16

https://www.futureelectronics.com/p/semiconductors--signal-interface--rs-232/icl3221eivz-t-renesas-9034756