ANC-6090 converts RS232 stage signals to RS422 or RS485 differential indicators for noise immune communication at 921 Kbaud at distances as much as 4000 feet The adapter may also be used for RS232 to TTL/CMOS serial interfacing. USB Serial - The ANC-6204 multi-interface USB adapter offers RS232, RS422/485 or TTL/CMOS in one converter. We function RS232, RS422, RS485, USB, and ethernet gadgets using copper and fiber.