SR-104A Serial Port Control 2 Channel Relay Module Time Delay Relay MCU Controller Production Board

Functional description The improved SR 104 module uses patch technology to support 5V or 9 12V input voltage Control the absorption and release of 2 way relay by serial command Set 1 255 seconds delay independently for each channel This is the case The operation is simple most of the serial instructions need only 1 byte to realize the function Provide VB upper computer program and source code more easily realize computer remote control After receiving each instruction the module returns the latest status of all relays In addition the module can also respond to relay status queries from the host computer program The upper computer program can judge the success of each operation by these feedback from the module and improve the accuracy of control SR 104A can be extended to one more MO 94C 2 Relay Module Four relays are controlled by serial port Module features STC15F104W as main control chipSet 1 255 seconds delay independently for each channelEasy to operate most serial instructions are single byte instructionsOn board 2 way relayRelay with Absorbing Diode CircuitEach road has LED light light on relay suctionA MO 94C module can be extended to control four relays through serial port With 1 power supply indicator lampImprovement of working stability of filter circuit with capacitanceSupport 5V or 9 12V input voltage1 6 mm thick PCB is made of military grade FR 4 sheet metal with reserved mounting holes PCB size 71mmx 47 mm Weight 46 gPower requirements DC4 5