USB to Serial Adapter. The USB to Serial adapter is tough and ultra small for use in any environment. The high retention USB connection requires a minimum withdrawal requirement of 15N. The connectors have orange colour-coded insulators to differentiate from standard USB connectors. 1 port RS232 ( ; 877-7240 877-7240 ) 1 port RS422/485 ( ; 877-7244 877-7244 ) High retention USB connector for an unbreakable connection Supplied with a 50cm USB cable Smallest form factor USB to Serial Works where many other USB to Serial devices do not IP50 protection Lifetime warranty and support