20-Channel I/O Controller 

1. Synopsis
JMDM-COM20DI is a high-reliable stability industrial-grade SCM digital and serial port controller which independent research and development by Shenzhen jingmin digital machine Co., Ltd. Onboard 20-channel optically isolated digital signal input, can be used to detect all kinds of the external switch signals input, such as photo electricity sensors infrared sensors, hall sensor, proximity switch, Point switches and other digital input devices, the product has the following characteristics:  
1) Product design and quality: professional industrial-grade high-reliable anti-lightning resist the strong electromagnetic high-frequency interference circuit design, the circuit layout is compact and reasonable, excellent heat dissipation, the use of SMD chips and electronic components, the program of the product with high security and reliable industrial quality, stable performance, can competent to a variety of large electromagnetic interference, harsh environment industrial occasions, such as arc current, welding current, inverter and the other workplace can of steady use.  
2) 20-channel optically isolated digital input characteristics:  
2.1 20channel optically isolated digital use the circuit design method of optically isolated, stable and reliable;  
2.2 20channel optically isolated digital input can be divided into four groups, can respectively use in the difference voltage occasions; each channel of the digital input of the input voltage range is 3.3V~24V; input the current range is 5-10mA;  
3) 2 kinds of communication interface for choosing: 1 RS485 serial port monitoring mode;  
4) 3 kinds of working methods: support independent control, RS232 serial port monitoring and RS485 serial port monitoring 
5) Precise time control: Comes with the system clock for precise time control;  
6) System stability: with industrial grade anti-lightning, strong anti-electromagnetism interference, high reliable performance, no crash.  
7) Digital working status indicator: each channel digital input has a indicator, convenient to observe the input point working status.  
8) Industrial housing, the compact appearance, dustproof and beautiful, integrated compact design, easy for installation: rail or screw mounts;  
9) Provide easy to use serial port communication protocol, the host computer source code, the convenience of customers for the secondary development. 

Use 
1) Can be used for the detection of a variety of external signal of the sensor input, such as photo electricity sensor, infrared sensor, Hall sensor, proximity switches, jog switches and the other digital input devices etc.  
2) Widely used in large-scale intelligent interactive multimedia trade: large-scale virtual open book, magic Book, electric open book, distance for open book, Magic open book, a virtual electronic open book, a virtual air electronic open book, intelligent multimedia control wall, light and shadow interactive control, the LED interactive control of virtual process control systems, such as advertising, exhibition hall application; can be used as intelligent multimedia controller, interactive multimedia controller, projection interactive controller, lihgt and shadow interactive controller, LED interactive controller, virtual air electronic intelligence multimedia controller;  
3) Can use the host computer serial port remote real-time monitoring the status of some digital signal and the on-and-off status of all kinds of devices;  
4) Can be used a variety of distributed control system, remote IO module, the digital capacity signal collection of the remote control system;  
5) Widely used in the on-and-off testing of the line, the quality detection of the line row.