Edwards nEXT nEXT85 - Figure 18 Conceptual Diagram for Multi-Drop Connection Using RS232 Interface

▪ All mul‑drop commands, queries or replies have the rst character as #.
▪ All commands, queries and replies have a header that has:
▪ the address of the node that the message is to
▪ the address of the node that the message is from
▪ Delimiter character: (colon) which separates the two mul‑drop addresses in the
header
▪ The remaining message (command, query or reply) obeys the same protocol as
given for the single pump systems.
▪
The wild card address 99 is useful which means 'any' node.
Aer a pump has been assigned a mul‑drop address, it will ignore the messages in the
format for the single pumps. An individual pump will ignore all the command messages
unless the mul‑drop address matches its own address.
Figure 18 Conceptual diagram for mul-drop connecon using RS232 interface
1. RS232 interface on control equipment 2. Buer
3. nEXT pump 4. OR gate
1. RS232 interface on control equipment 2. Buer
3. nEXT pump 4. OR gate
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B8G000880_D - Installaon