Normal Mode Versus Msu Mode In Rs-485 Multi-Drop Configurations - Honeywell CIU 888 Protocol Manual

FIGURE 1-8
1 - 10
CIU Emulation

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.
Diagram for handling of requests in Normal mode (MSU mode not enabled)
Protocol Manual - CIU Emulation
CIU 888
Part No.: 4417589_Rev13