We offer Usb.Introduction:usb485 is a kind of usb to rs-485422 industrial intelligent converter. It is the best solution for the communication between usb and rs-485422. Compared with rs-232 to rs-485422 converter, usb to rs-485422 converter has many advantages. Features:1. Small volume, easy installation2. No power supply needed, plug and play3. Single chip(asic) usb port to serial port communication4. Transmit distance reach up to 1800m at the rate of 115200bps.5. Automatic send data control, auto distinguish and sense direction adopt data transfer6. Auto sense serial signal rate, zero delay automatic transmit specifications:usbcompliance: usb1.12.0 compliantconnector: usb type aspeed: 12mbps(full-speed usb) serial interfacenumbers of ports: 1serial standards: rs485422connector: db9 maleserial line protectionesd protection: 15kv embedded performancebaud rate: 300bps to 230400bpsserial communication parametersdata bites: 5, 6, 7, 8stop bits: 1, 1.5, 2parity: none, even, odd, space, markflow control: rtscts, xonxofffifo: 128bytes serial signalsrs-485: d+, d-, gndrs-422: t+, r+, t-, r-, gndloading: 32 nodes or custom 128 nodestransmission: rs-485 1800m(115200bps), usb 5m driver supportoperating system: support windows98me and windows2000xp, windows server 20032008, windows 7vista physical characteristicsweight: products only: 70gpackaged: 120gdimension: 70mm35mm18mm(wiring 1.5m) environmentworking temperature: -10 to 60 storage temperature: -25 to 85 humidity: relative humidity 5% to 95% power requirementsno power supply needed, powered from usb consumption: static consumption less than 80ma, dynamic average consumption less than 150ma warranty: 5 yearsapprovals: fcc, ce, rohs approvals