4 • vacon technical dataTel. +358 (0)201 2121 • Fax +358 (0)201 212 20522. BACNET OPTION BOARD TECHNICAL DATAConnections Interface OPT-CJ: Pluggable connector (5.08mm)Data transfermethodRS-485 MS/TP, half-duplexTransfer cable Twisted pair (1 pair and shield)Electrical isolation 500 VDCCommunications BACnet MS/TP As described in ANSI/ASHRAE Standards 135-2004Baud rate 9600, 19200, 38400 and 76800 baud (supports autobauddetection)MAC Addresses 1 to 127Environment Ambient operatingtemperature–10°C…55°CStoringtemperature–40°C…60°CHumidity <95%, no condensation allowedAltitude Max. 1000 mVibration 0.5 G at 9…200 HzSafety Fulfils EN50178 standardTable 2-1. BACnet technical data