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▪
All multi
‑
drop commands, queries or replies have the first 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 multi
‑
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.
After a pump has been assigned a multi
‑
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 multi
‑
drop address matches its own address.
Figure 24 Conceptual diagram for multi-drop connection using RS232 interface
1. RS232 interface on control equipment
2. Buffer
3. nEXT pump
4. OR gate
1. RS232 interface on control equipment
2. Buffer
3. nEXT pump
4. OR gate
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B8G000880_E - Installation
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