Honeywell CIU 888 - Installing CIU 888 Service Tool; Installing CIU 888 Service Tool on the new machine

CIU Emulation
Protocol Manual - CIU Emulation Part No.: 4417589_Rev13
1 - 10 CIU 888
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1.3.3 Normal mode versus MSU mode in RS-485 multi-drop configurations
In a RS-485 multi-drop configuration, it is recommended to enable MSU
mode instead of Normal mode (configuration setting of the CIU Prime
host port) to ensure a proper handling of requests and replies.
In Normal mode, requests are handled according to the diagram shown
in FIGURE 1-8.
FIGURE 1-8 Diagram for handling of requests in Normal mode (MSU mode not enabled)