5 UCN Exerciser
5.3 Request Data Response (RDR) Test
392 HPM High-Performance Process Manager Service R688
Honeywell December 2020
5.3 Request Data Response (RDR) Test
Introduction
In the Request Data Response test, as illustrated in the following figure, the Test Master, a Network
Interface Module (NIM), attempts to communicate on a point-to-point basis with every UCN node
configured to participate in the test. A node can be ALIVE, BUT NOT TOKEN PASSING and still
participate in this test using its "shadow address," numbered 65-128. This check is to determine with
which participants in the test the Master can communicate.
Figure 191 RDR Test Configuration
RDR protocol
The communications protocol used for this part of the test is RDR protocol. All nodes that are powered
on and/or are capable of receiving and transmitting messages, should respond to the RDR from the test
Master. A node that does not respond is assumed to be not on the network and is not requested to
participate in the triangulation part of the test. A node that does respond but whose status indicates that it
is not capable of token passing will also not be requested to participate in the triangulation part of the
test.
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