DVI optical fiber is a transmission scheme based on fiber optic media. It is very prominent in certain advantages, but I heard that DVI fiber lacks RS232 which is the same thing for transmission. Is it influence the transmission? The first thing to understand is what DVI fiber lacks.
RS-232 interface complies with the interface standard for serial data communication established by the Electronic Industries Alliance (EIA). The original number is EIA-RS-232 (232, RS232 for short). It is widely used for computer serial interface peripheral connections. Connect cables and mechanical, electrical, signal, and transfer processes.
RS232 is now one of the mainstream serial communication interface As the RS232 interface standard appeared earlier, it is inevitable that there are deficiencies, mainly in the following four points:
1.The signal level of the interface is high, which is easy to damage the chip of the interface circuit. The voltage of any signal line on the RS232 interface is in a negative logic relationship. That is: the logic "1" is -3 - 15V; the logic is "0": +3 - +15V, and the noise margin is 2V. That is, the receiver is required to recognize a signal higher than +3V as a logic "0", a signal lower than -3V as a logic "1", a TTL level of 5V as a logic positive, and 0 as a logic negative. Incompatible with the TTL level, a level shifting circuit is required to connect to the TTL circuit.
2. The transmission rate is low. In asynchronous transmission, the bit rate is 20Kbps; therefore, in the 51CPLD development board, the integrated program baud rate can only be 19200, which is also the reason.
3. The interface uses a signal line and a signal return line to form a common ground transmission form. This common ground transmission is prone to common mode interference, so the noise immunity is weak.
4. The transmission distance is limited. The maximum transmission distance is 50 feet. In fact, it can only be used at about 15 meters.
DVI fiber and RS232 pass by is not a little regret, no, it has DVI-D interface and LC optical interface, does not have HDMI interface design is because in actual use, whether it is display terminal or intermediate processing equipment Or the video source, for the convenience of post-maintenance, use the DVI to HDMI adapter to connect the module, which can reduce the insertion and removal damage of each device interface. Learn more about the HDMI cable, pls focus on Starte website: www.starte-cable.com