Question

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三 RS-422电气规定
RS-422标准全称是“平衡电压数字接口电路的电气特性”,它定义了接口电路的特性。由于接收器采用高输入阻抗和发送驱动器比RS232更强的驱动能力,故允许在相同传输线上连接多个接收节点,最多可接10个节点。即一个主设备,其余为从设备,从设备之间不能通信,所以RS-422支持点对多的双向通信。接收器输入阻抗为4k,故发端最大负载能力是10×4k+100Ω（终接电阻）。RS-422四线接口由于采用单独的发送和接收通道,因此不必控制数据方向,各装置之间任何必须的信号交换均可以按软件方式或硬件方式实现。
RS-422的最大传输距离为4000英尺（约1219米）,最大传输速率为10Mb/s。其平衡双绞线的长度与传输速率成反比,在100kb/s速率以下,才可能达到最大传输距离。只有在很短的距离下才能获得最高速率传输。一般100米长的双绞线上所能获得的最大传输速率仅为1Mb/s。
四 RS-485电气规定
由于RS-485是从RS-422基础上发展而来的,所以RS-485许多电气规定与RS-422相仿。如都采用平衡传输方式、都需要在传输线上接终接电阻等。RS-485可以采用二线与四线方式,二线制可实现真正的多点双向通信。 而采用四线连接时与RS-422一样只能实现点对多的通信,即只能有一个主设备,其余为从设备,但它比RS-422有改进, 无论四线还是二线连接方式总线上可多接到32个设备。
RS-485与RS-422一样,其最大传输距离约为1219米,最大传输速率为10Mb/s。平衡双绞线的长度与传输速率成反比,在100kb/s速率以下,才可能使用规定最长的电缆长度。只有在很短的距离下才能获得最高速率传输。一般100米长双绞线最大传输速率仅为1Mb/s。

Answer 1

Three RS-422 electrical requirements
RS-422 standard name is "balanced digital interface circuit voltage electrical characteristics", which defines the characteristics of the interface circuit. As the receiver using high input impedance and send drive RS232 stronger than the drive capability, it allows the same number of transmission lines connecting nodes to receive up to 10 access nodes. That is a main equipment, the rest is from the equipment, communications devices can not, so RS-422 support point on the number of two-way communication. Receiver input impedance for the 4 k, is the originator maximum load capacity is 10 × 4k +100 Ω (termination of the resistance). RS-422 four-lane as a separate interface to send and receive channels, there is no need to control the direction of data, the device must be between any of the signals can be exchanged by the software or hardware means.
RS-422 transmission distance for the largest 4,000 feet (1,219 meters), the largest transfer rate of 10 Mb / s. The balance of its length and twisted pair transmission rate is inversely proportional to the 100 kb / s rate below, before the largest possible transmission distance. Only in a very short distance to get the highest rate of transmission. General 100 m long on the twisted pair can be the biggest transfer rate of only 1 Mb / s.
40 RS-485 electrical requirements
As RS-485 from the RS-422 on the basis of developed from, so many electrical RS-485 and RS-422 provides similar. Such as balance transfer method used, the transmission lines need to termination of the resistance, and so on. RS-485 can be used with the four-way second-line, second-line system can be a real multi-point two-way communication. And a four-lane connection with the RS-422 can only achieve the same point on the number of communications, that is, there can be only one main equipment and the remainder are from the equipment, but it than the RS-422 improvements, both four-or second-line connections total Online can be received more than 32 devices.
RS-485 and RS-422, the largest of its transmission distance of about 1,219 meters, the largest transfer rate of 10 Mb / s. Twisted pair of balance transfer rate and inversely proportional to the length of the 100 kb / s rate below, it may use the provisions of the longest cable length. Only in a very short distance to get the highest rate of transmission. General 100 m long twisted pair transmission rate was the largest 1 Mb / s.

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Answer 2

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Answer 3

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