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LonPoint Hardware Guide 3-3

Termination

Figure 3.4 Mixed Topology (Model 44100 Terminator)

TerminationTermination

Figure 3.5 Doubly Terminated Bus Topology - Used for Very Long Cabling Distances

(Two Model 44101 Terminators)

A network consisting of LonPoint modules using the FTT-10A transceiver is said to

reside on a “TP/FT-10 channel.” In some cases all of the LonPoint modules will be

connected to a single TP/FT-10 channel. A maximum of 64 devices (LonPoint

modules, routers, PCLTA-10 and PCC-10 PC adapters, third-party LONMARK

devices) may be connected to any one channel. If more than 64 devices are to be

used, or if it is necessary to add more cabling than is permitted on a single channel,

then one or more model 42100 LPR-10 Routers (TP/FT-10 to TP/FT-10) would be

placed in series with the network cabling.

Another application for the LPR Router is to limit the amount of network

communications passing between different parts of a control network. For example,

LPR Routers can restrict the transfer of messages from a portion of the network

with many active PID loops to other, more quiescent parts of the network. In this

case one or more model 42100 LPR-10 Routers would be placed in series with the

network cabling.

The LPR Router can also be used to create a high-speed backbone that brings

together many different channels, perhaps to a monitoring PC. In this case it may

be desirable to increase the speed of the backbone channel in order to better manage

the communication traffic. For example, in a highrise building it might be desirable

to have a78 kilobit per second TP/FT-10 free topology channel operating on each

floor, and use a 1.25 megabit per second channel to link together all of the floor

channels with a PC in the basement. In this case, one model 42102 LPR-12 Router

(TP/FT-10 to TP/XF-1250) would be placed on each floor and a separate 1.25Mbps

twisted pair channel would serve as a backbone.

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Echelon LonPoint Module Manual de usuario Pagina 25