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Relay Timer R4X is programmable timer software to control and set timing features of relay. It works with 4-channel relay controller boards of National Control Devices (NCD) . It supports Com Port and Network connection between PC and relay board. The connection status is detected and shown continuously. It will remind after disconnection and recover after reconnection automatically. Relay can be turned on/off manually and automatically according to powerful schedule setting. Relays can also be controlled remotely from other computers. Each relay can be programmed separately with multiple schedules. The current status of relay is updated and displayed simultaneously. The program can be set to run automatically after logging in Windows. It can control the relay with very precise timer, while consuming the processor's resource at very low level.