... ;50Pin extended interface, to the height of 128 points;RS232 and RS485 communication without the jumper, and also supports GSM ... documentVC, VB, Delphi develop package, dynamic library DEMO and source code;Buttons, switches, timing, GSM / GPRS wireless communications and other ... button, switchPlayerLED Player 3.2Software for LS-D3(LAN,USB,RS232) led display controller Edit static text, single-line text, ...