WESDAC D20 C控制处理器,GE通用电气支持UCMM的组2服务器▪ 每个从机一个或两个输入/输出连接-通常一个连接是用于轮询，另一个用于选通、循环或COS▪ 支持带有一个代理的未连接消息管理器（UCMM）每个从设备的连接▪ 可配置的全局扫描速率▪ 支持轮询、选通、循环和COS输入/输出连接，分段输入/输出和显式消息传递▪ 连接上轮询和COS/Cyclic的可配置更新速率原因▪ 对通信中断的可配置响应▪ 通过模块上的服务端口更新固件模块的三个DeviceNet兼容LED显示其操作和通信状态。

WESDAC D20 C控制处理器RS-232串行端口用于固件升级期间的计算机连接。这个DeviceNet连接器是一个可拆卸的弹簧夹端子。它提供总线连续性和can在不中断总线操作的情况下，从模块中卸下。设备可以直接连接到中继电缆，也可以连接到连接到中继的支线带分接头的电缆。分接头可以安装在接线盒或面板中。下降线和菊花链通常在多个设备组合在一起的控制面板内使用。使用时带有菊花链和树枝的水滴，从水龙头到其最远水滴的最大长度为20脚。总线长度中继电缆和中继线的最大长度取决于电缆类型和数据速率。单个落差不得超过6米，并且每个落差仅限于一个网络节点。然而，节点可能有多个端口。对于每个波特率，总下降长度是中两种电缆类型的所有下降线的总和网络。此外，如果从分接头到其下降点上最远设备的距离大于从抽头到最近端接电阻器的距离，下降线长度也算作一部分中继电缆长度（以及总落差长度）

UCMM-capable Group 2 Server 

▪ One or two I/O connections per Slave - Typically one connection is 

used for Polled and the other is used for Strobe, Cyclic, or COS 

▪ Supports Unconnected Message Manager (UCMM) with one proxy 

connection per slave device 

▪ Configurable global scan rate 

▪ Supports Poll, Strobe, Cyclic and COS I/O connections, Fragmented 

I/O and Explicit Messaging 

▪ Configurable update rates for Poll and COS/Cyclic on a connection 

basis. 

▪ Configurable response to loss of communication 

▪ Firmware update via service port on moduleThe module's three DeviceNet-compliant LEDS show its operating and communications status. 

The RS-232 serial port is used for a computer connection during firmware upgrades. The 

DeviceNet connector is a removable spring-clamp terminal. It provides bus continuity and can 

be removed from the module without disrupting bus operation.Devices can be connected directly to the trunk cable, or to drop lines that are joined to the trunk 

cable with taps. Taps can be mounted in junction boxes or panels. Drop lines and daisy-chains 

are often used inside control panels where multiple devices are grouped together. When using 

drops with daisy-chains and branches, the maximum length from a tap to its farthest drop is 20 

feet.Bus Length 

The maximum length of the trunk cable and drops both depend on the cable type and data rate. 

Individual drops may not exceed 6 meters and are limited to one network node per drop. 

However, the node may have multiple ports.For each baud rate, the total drop length is the sum of all the drop lines of both cable types in 

the network. 

In addition, if the distance from a tap to the most distant device on its drop is longer than the 

distance from the tap to the nearest terminating resistor, the drop line length also counts as part 

of the trunk cable length (as well as the overall drop length)