Edwards nEXT730 - Message Structure; Command and Reply Table Definitions

B8J200880_E - Configuration
Page 81
Standby speed setting
on page 84
The pump can be run at standby speed rather than full rotational speed.
The standby speed is a user-configurable option and can be set to any value
between 55% and 100% full rotational speed.
Normal speed setting on
page 84
The normal speed is a user-configurable setting and can be set to any value
between 50% and 100% full rotational speed.
Timer setting and
options on page 85
The timeout period is a user-configurable option and can be set to any
value from 1 to 30 minutes.
Analogue signal options
on page 86
The analogue output can be used to monitor one of five different
parameters.
Electronic braking
options on page 86
The pump is supplied with the electronic braking disabled by default.
Factory settings on page
87
The nEXT pump can be re-configured to its original factory settings with one
serial command.
Assigning a multi-drop
address on page 87
Each individual pump must be programmed with its own multi-drop
address via a point-to-point connection before introduction into a multi-
drop network.
6.1.1 Message structure
The message structure and command set are the same for RS485 and RS232 options. To
communicate a message to the nEXT pump, the characters must be sent in a specific
order. If the message does not conform to the correct structure it will be ignored and no
reply will be sent.
The correct structure to use is as follows:
▪ a valid start character, either a '!' character for a store operation or a '?' character
for a query operation, followed by
▪ a command, which will be an upper case alphabetical character, followed by
▪ an object number, comprising three decimal digits, followed by
▪ for some commands only, a data field, comprising 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 marginally different, refer to Multi-drop
operation on page 52.
6.1.2 Command and reply table definitions
Explanation of the command and reply characters.
Table 16 Command abbreviations
Abbreviation
Meaning
cr
Carriage return character
chars
Characters
d
Decimal ASCII character
*
h
Hexadecimal ASCII character