RS232 to RS 422, Port-powered from RS232 port (TXD,RTS,DTR): no external ... between RS-232 and RS-422. It is powered from serial port (such as COM port of computer ), ... price data interface conversion product.Features:1. Port-powered from RS232 port (TXD,RTS,DTR): no external power ... terminal block) PowerPower input: No power supply need, powered from RS-232 port TXD, RTS, DTRConsumption: Static less ...