... service Led Moving Sign Display Communication: RS232/RS485 com port, PC-USB port, or Infra-red remote controland so on Outdoor LED ... , Amber, Blue, Red ect. 4. Communication: RS232/RS485 com port, PC-USB port, or Infra-red remote controland so on. 5. Display ... . Optional communication ways: 1. RS232/RS485 2. Remote control 3. USB 4. TCP/IP 5. GPRS 6. GSM