Edwards nEXT200200 - Message Structure; Command Set; Figure 15 RS485 Multi-Drop Connection

Figure 15 RS485 mul-dr
op connecon
1. RS485 interface on control equipment 2. pump logic interface1. RS485 interface on control equipment 2. pump logic interface
4.7.4 Message structure
The messag
e structure and command set are the same for RS485 and RS232 opons. To
communicate a message to the pump, send the characters in a specic 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 oper
aon or
▪ '?' character for a query operaon followed by
▪ a command: an upper case alphabecal character, followed by
▪ an object number: has three decimal digits, followed by
▪ a data eld (only for some commands): has a sequence of characters separated
from the object number by a space, followed by
▪ a terminang carriage return.
The message protocol in mul‑drop mode is dierent. Refer to Mul-drop operaon 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 - Installaon