-232C data interface fully compatible with PC, -485 interface has DB9 connector and four-position terminal block optional Automatic flow control of data transmission (TXD), zero delay design Power supply mode: efficient serial port power stealing technology, no external power supply required, true three-wire (TD, RD, GND) communication Working mode: asynchronous half-duplex Transmission rate: 0-115200BPS Transmission distance: 0-1200 meters @24AWG Application areas: Point-to-point, point-to-multipoint communication Industrial distribution system, industrial control automation Road traffic control automation Closed-circuit monitoring Security system Smart card, attendance access control system Color:As Shown Material:plastic Package Contents: 1 * Adapter Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.