... 2; EM4x02, EM4x50 etc,using external antenna and serial port, it connect with the host device and the ... 211PCRXSignal receive12PCTXSignal send16ENABLEEnable17RLEDLight indication18GLEDLight indication19GNDPower ground specifications InterfaceTTL, RS232 or RS485Dimension30,5 x 25,5 x 9,5mm ... EM4100, EM4550 ,NXP Hitag 1,2,SInterface:TTL, RS232 , RS485(optional )Power Supply:5V or 12VAntenna:two ...