... of customized, cheap and easy-maintainable led display receiving cards sgr-r502 ROHS, FCC or IP65, ... Sending card) 1) Sending card SGR-A602 and receiving card 5.Port Descriptions ①:Power Port: ... etc. Two Ports is same ③:Testing button: after adjusted display working normal, then press by sequence, ... is flicker fast, showed recognized the Gigabit and receiving data. ⑤:16 PORT of HUB75B: Connected LED ...