... ;50Pin extended interface, to the height of 128 points;RS232 and RS485 communication without the jumper, and also supports GSM / ... Cluster Mass-sending System;led display control card LS-D3(ALL) parameters Item No.LS-D3(LAN,USB,RS232)RangeSingle color 2048 ... 1/4,1/2, static routingScan interface50PIN interfaceCommunication modeRS232,RS485,100M RJ-45 Port,USBWireless communication Support RF/GPRS/ ...