Edwards nEXT200200, Инструкция по эксплуатации

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Figure 15 RS485 multi-drop connection
1. RS485 interface on control equipment 2. pump logic interface 1. RS485 interface on control equipment 2. pump logic interface
4.7.4 Message structure
The message structure and command set are the same for RS485 and RS232 options. To
communicate a message to the pump, send the characters in a specific order. If the
message is not in a correct structure, the message will be ignored and the pump will not
send the reply.
The correct structure of the message is as follows:
▪ a valid start character:
▪ '!' character for a store operation or
▪ '?' character for a query operation followed by
▪ a command: an upper case alphabetical character, followed by
▪ an object number: has three decimal digits, followed by
▪ a data field (only for some commands): has a sequence of characters separated
from the object number by a space, followed by
▪ a terminating carriage return.
The message protocol in multi
‑
drop mode is different. Refer to Multi-drop operation on
page 50 .
4.7.5 Command set
Refer to Table: Summary of commands that can be sent to the nEXT pump on page 47 for
the summary of the full set of commands available to control and monitor the pump.
Page 46
B85200880_D - Installation