The PCI to RS422 / RS485 converter supports four communication modes: 1. Point-to-point/4-wire full duplex2. Point-to-multipoint/4-wire full duplex3. Point-to-point / 2-wire half duplex4. Point-to-multipoint/2-wire half-duplexCompliant with PCI specification revision 2.1, compatible with RS485 RS422 standardConnection port: DB-9Working mode: asynchronous work, point-to-point or point-to-many, full-duplex 4-wire, half-duplex 2-wireCommunication signal: RS422 signal: T / R +, T / R-, RXD +, RXD, GND; RS485 signal: T / R +, T / R, GNDTransmission medium: twisted pair or shielded wireTransmission rate: 38400bps at 600M, 9600bps at 1.2KMSignal rate: 75-128000bps (automatic detection)Load capacity: each converter allows to connect 32 RS422&RS485 or more devicesOperating environment: -25~70, relative humidity 5%~95%Each serial signal is used for additional TVS transient diodes, which can crosstalk with the following 400W surge signals and ensure communication stability.PIN-in photoelectric isolation and DC-DC voltage converter can effectively isolate external pressure and avoid the influence of equipment.support system:Windows 98se / Windows 2000 / XP / Server 2003 / Vista / Win7 / Win8 32/64 bit, Linux / MacAvailable PCI slotsRiser card size: 121 x 70mmConnector size: 31 x 31mmColour: blackMaterial: PCB + metalPackage Contents:1 x PCI MCS9865 RS485&RS422 conversion card2 x DB9 to 6-PIN connectorOnly the above package content, other products are not included.Note: Light shooting 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.