Edwards nRVi, Instruction Manual

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Every complete command message sent will receive a response - either a status code or
a data return. The pump can only process one message at a time. It will only accept a
new message once the response to the previous message has been returned.
If the pump receives characters that are not framed inside start and stop characters, it
will ignore them. Messages with the stop character missing will be discarded with no
response when a new start character is received. If the pump receives an unrecognisable
message between the start and stop characters, it will return an appropriate error
message.
Table 19
Summary of commands that can be sent to the pump
Object
name
Command
Parameter
range
Factory
setting
Data type Units
Comments
Identification ?S0 - - - - Acts as wildcard object
number to identify
instrument. Reply
identical to ?S801
Node ?S800 0..98 0 Decimal Slave
Address
Multi-drop address
(RS485)
!S800 0 = disable multi-drop
mode;
Pump type ?S801 [1..8] - String ASCII
Characters
Pump type (nRVi )
[1..11] - String ASCII
Characters
Motor Control Software
Version number
(Dxxxxxxxx Y) (where
Dxxxxxxxx is the
drawing number and Y
is the revision)
1..255 - String Hz Design frequency (=
Nominal mechanical
frequency of the pump)
Pump
control
!C802 0 - Decimal - Stop the pump
1 - Decimal Start the pump
?V802 0..255 - Decimal Hz Reported motor
frequency
64-bits
encoded as
four 16-bit
words:
<0000..FFFF>;
<0000..FFFF>;
<0000..FFFF>;
<0000..FFFF>
- Hexadecimal - System status:
System status register
1;
System status register
2;
Warning register and
Fault register
Speed
control
!C803 0 - Decimal - Use full speed
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A65901880_D - Technical data