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DVI光纤缺乏RS232是什么意思?

date:On December 13, 2017 Source:  

   DVI光纤是一种以光纤介质的传输方案,在一定的优势上是非常的突出的,但是听说DVI光纤缺乏RS232是怎么的一回事的,这对于传输是否有什么影响。首先要了解DVI光纤所缺少的东西。

DVI fiber is a fiber optic media transmission program, in certain advantages is very prominent, but I heard that DVI fiber is the lack of RS232 is one thing, which for transmission has any effect. First of all to understand what is missing DVI fiber.


   RS232-RS232

RS232

   RS-232接口符合美国电子工业联盟(EIA)制定的串行数据通信的接口标准,原始编号全称是EIA-RS-232(简称232,RS232)。它被广泛用于计算机串行接口外设连接。连接电缆和机械、电气特性、信号功能及传送过程。

RS232 interface with the United States Electronics Industry Alliance (EIA) developed serial data communication interface standard, the original full name is EIA-RS232 (232, RS232). It is widely used in computer serial interface peripheral connection. Connection cables and mechanical, electrical characteristics, signal functions and transfer process.


   RS-232是现在主流的串行通信接口之一。由于RS232接口标准出现较早,难免有不足之处,主要有以下四点:

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)接口的信号电平值较高,易损坏接口电路的芯片。RS232接口任何一条信号线的电压均为负逻辑关系。即:逻辑“1”为-3—-15V;逻辑“0”:+3—+15V,噪声容限为2V。即要求接收器能识别高于+3V的信号作为逻辑“0”,低于-3V的信号作为逻辑“1”,TTL电平为5V为逻辑正,0为逻辑负。与TTL电平不兼容故需使用电平转换电路方能与TTL电路连接。

(1) The interface signal level is high, easy to damage the interface circuit chip.RS232 interface any one of the signal line voltage is a negative logic relationship: the logic "1" for the -3-15V; logic "0": + 3- + 15V, a noise margin of 2V requires the receiver to recognize signals above + 3V as logic "0", signals below -3V as logic "1" and TTL levels as logic of 5V. Positive, 0 is a negative logic. TTL level is not compatible with the need to use the level conversion circuit can TTL circuit connection.


   (2)传输速率较低,在异步传输时,比特率为20Kbps;因此在51CPLD开发板中,综合程序波特率只能采用19200,也是这个原因。

(2) lower transmission rate, asynchronous transmission, the bit rate of 20Kbps appearance; so 51CPLD development board, the integrated program baud rate can only use 19200, is the reason.


   (3)接口使用一根信号线和一根信号返回线而构成共地的传输形式,这种共地传输容易产生共模干扰,所以抗噪声干扰性弱。

(3) The interface uses a signal line and a signal return line to form a common ground transmission form. This common ground transmission tends to cause common mode interference, so the anti-noise interference is weak.


   (4)传输距离有限,最大传输距离标准值为50英尺,实际上也只能用在15米左右。

(4) transmission distance is limited, the maximum transmission distance standard value of 50 feet, in fact, can only be used in about 15 meters.


   DVI光纤与RS232的擦身而过是不是少了一点遗憾呢,不,本身具备DVI-D接口与LC光接口,不具备HDMI接口的设计是因为在实际使用中无论是显示终端还是中间处理设备或者是视频源,为了后期维护方便,都使用DVI转HDMI的转接头来连接该模块,这样可降低各设备接口的插拔损伤。了解更多就在就利诺威HDMI线厂家。

DVI fiber and RS232 pass is not a little less regrettable, no, with its own DVI-D interface and LC optical interface, do not have the design of the HDMI interface because in the actual use of both terminal or intermediate display processing equipment Or video source, for the convenience of later maintenance, all use DVI to HDMI adapter to connect the module, so as to reduce the plug-in damage of each device interface. Learn more Just on the HDMI cable manufacturers.


   想了解更多相关信息请登陆利诺威网站HDMI线:http://www.hdmiaoc.com/


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In previous :播放闪屏的问题,DVI光纤 next article :DVI光纤的信号传输优势的