... with relay activation.) This can be used for parking latch control, gsm gate opener, remote control machine, etc. An automation system. Each ... or RS485 Port, at present supports ABB,KL,HHE intelligent meters by RS485, more special meters’ communication protocol can ... machine rooms;17. Control room application; 18. PLC and Automation System, M2M;19. GSM Access Control System, GSM Gate Opener, etc. GSM ...