... , voltage regulator, 2 channels DB-9 serial port connector, 1 USB connector, switches and LED which ... display the datas of P0 port,if LCD module connects to P0 port, the LED nixie tube may ... then add new serial debugging, not occupy internal serial port. Signal put out through J6 & J7USB : USB ... to users.LCD module:evaluation kit supports Optrex DMC16207 or standard parallel LCD port of similar products. ...