This module interfaces USB to RS-485. It has Auto Direction control, making it easier to use as RS-232/TTL Serial Interface replacement.
RS485 is used for Serial Communications over longer distances than direct RS232 or TTL, and supports multiple units on the same bus (Multi-Drop)
1 x Serial Converter Module
This converter provides two way serial communications signal conversion between the RS485
to and from a personal computer USB port using virtual serial COM port. Can have up to 32 devices on the bus.
The 4 jumpers connect the USB interface to the RS485 interface. If the jumpers are removed, the USB interface may be used as a TTL Level Serial port.
The drivers for Windows can be loaded by this program from FTDI:
Plugging the USB interface in then should show a Virtual Serial Port in Device Manager.
Self-powered from USB Uses FT232RL+75176 chips
Can be used to connect PC to one or more Arduino or other Microcomputers with RS-485 modules.