1.Control 4 doors 4 readers 2. RS232 RS485 no need jumper and adaptive 9600 bps 3.well accepted and adopted by banks AMJ2004 Control 4 doors 4 readers,-get in the door by swiping card, and get out door by buttonl Our professional access controllers contains all typical access controller functions: offline operation, real time supervision, photo display, mass storage, flexible user privilege setup ...