USB to RS485 RS232 Serial Converter with 5 Meter USB Transmission Distance
(A+TXD: RS485 to A, RS232 to RXD. B-RXD: RS485 to B, RS232 to TXD. Transmission mode: Point-to-point (up to 32 nodes, maximum 16 nodes). A repeater is required if multiple nodes are needed). TXD: Transmit indicator.