RMN-002 is the Master Module that will be the connector between digital input and output from outside and the remote control system through 2 Wire system. Master Module will have 8 channele of digital input and output and can be connected together with Expansion Input/Output Module as highest at 32 channels. The Alarm channel displays on LED in case 2 Wire system has problem, it needs at least two Master Modules to install on the starting point and the end.