... Remark: N denotes q ' ty of computer serial prot or q ' ty of 485hub port, support 256pcs ports Operation Temperature - 40 C ... less than 13m, suggestion distance is 3m or less RS485: bus line max length 1200m, suggestion length 1000m or less, if ... board, case, power, power line, serial port communication line, software, manual, certificate, key(2pcs), carton Alarm for long time door open, ilegal break ...