RS-485 InterfaceThe RS-485 can be e

RS-485 Interface
The RS-485 can be either half-duplex or full-duplex. In a full-duplex implementation, four wires
are required, and a node can simultaneously drive one pair of wires while receiving data on the
second pair of wires. In half-duplex, a single pair of wires is used for both driving and receiving.
In either case, the operation of all the nodes on the bus must be controlled so that, at most, one
driver is active on each pair of lines at any time.
Having two or more drivers simultaneously active on the same pair of wires causes errors in
data transmission and is called bus contention. Bus contention can be avoided by several
control strategies. One method is to have a single permanent master node in control. The drivers
on the bus transmit only with permission from the master node. Another strategy is to have any
node temporarily take on master responsibilities, as determined by a priority scheme. Another
strategy is to allocate distinct time segments to each of the nodes on the bus. Choosing a bus
control strategy is the responsibility of the system designer and may be constrained by available
SLLA112A
RS-485 for E-Meter Applications 3
processing power, or by the need to communicate with an existing network with predetermined
protocol.

結果 (中文) 1:

RS-485 接口RS 485 可以是半双工或全双工。在全双工实现中，四个电线是必需的和一个节点可以同时驱动一对电线上接收数据时第二双线。在半双工，电线一单一双用于驱动和接收。在任一情况下，所有总线上的节点必须的操作控制等最多，有一个人在任何时候，驱动程序是每一对线上活动。有两个或多个驱动程序同时活跃于同一对电线导致中的错误数据传输和称为总线争用。可以通过几个避免总线争用控制策略。一种方法是在控件中有一个单一的永久主节点。驱动程序在总线上传输只同意从主节点。另一个策略是有任何节点暂时承担在母版上的职责，确定的优先配屋计划。另一个策略是分配到每个节点在公共汽车上的不同时间段。选择一辆公交车控制策略是系统设计师的责任，可能会受到可用SLLA112ARS-485 电子水表应用程序 3预先确定的处理功率，或需要与现有的网络与通信协议。

結果 (中文) 3:

RS-485接口RS-485可以是半双工、全双工。在一个全双工的实现中，四根线是必需的，一个节点可以同时驱动一对电线，同时接收数据的第二对导线。在半双工中，一对电线被用于驱动和接收。在这两种情况下，总线上的所有节点的操作必须控制，因此，在大多数情况下，一司机在任何时候都主动对每一对线。有两个或两个以上的驱动程序同时在同一对电线上活动引起的错误数据传输和被称为总线争用。总线争用可避免几个控制策略。一种方法是在控件中有一个单一的永久性主节点。司机在总线上只从主节点的权限发送。另一个策略是有任何节点暂时承担主责任，由优先权计划确定。另一个策略是将不同的时间段分配给总线上的每个节点上。选择一个总线控制策略是系统设计人员的责任，可能会受到限制slla112a在电表中的应用3 RS-485处理能力，或通过与预定的现有网络进行通信的必要性协议.