Motorola V186 User Manual - Page 136
Two-Zone System, that communicates over RADIO 2.
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Communications The FEP in the system illustrated above serves as a network node between link RADIO 1 and link LINE 1. Configuring the FEP to have access to two different links enables it to serve as a node between these links. The MDLC protocol permits RTU-to-RTU communications without the intervention of the central computer. RTUs that are not on the same link communicate with each other via the network node (in this case, the FEP). A multi-link system is a network that uses several link types. The following figure illustrates a system where a third link type, RS232, connects an RTU to another terminal that communicates over RADIO 2. RTUs connected to the IP link can reach RTU 7 via IP network and then RADIO 2. RTU 3 Central Computer RS232 FEP RTU 1 RTU 2 IP RADIO 2 RTU 6 RTU 4 RTU 5 RS232 RTU 7 Two-Zone System A two-zone system that uses conventional radio over a single frequency is described in the following figure: ZONE 1 FEP RTU 9 Store & Forward ZONE 2 RTU 2 RTU 1 RTU 3 RTU 4 RTU 5 RTU 6 132