A735-01-860 Issue A
Page 8 © Edwards Limited 2012. All rights reserved.
Edwards and the Edwards logo are trademarks of Edwards Limited.
Connection for serial control and monitoring
Table 3 - Summary of the commands that can be sent to the nXDS pump
Object name Command
Parameter
range
Factory
setting
Data type Units Comments
Identification ?S0 - - - -
Acts as wildcard object num-
ber to identify
instrument.
Reply identical to ?S801
Node
?S800
!S800
0..98 0 Decimal
Slave
Address
Multi-drop address (RS485)
0 = disable multi-drop mode;
Pump type ?S801
[1..8] - String
ASCII
Characters
Pump type (nXDS)
[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>
-
Hexadeci-
mal
-
System status:
System status register 1;
System status register 2;
Warning register and Fault
register
*
Speed control !C803
0-Decimal
-
Use full speed
1 - Decimal Use standby speed
Normal speed
threshold
?S804
!S804
50..100 80 Decimal %
Normal speed status output
trigger level:
Percentage (%) of selected
speed
Standby speed
setting
?S805
!S805
66..100 70 Decimal %
Standby speed of pump:
Percentage (%) of full
mechanical speed (see 801)
!S stores standby speed to
non-volatile memory
(use !C805 for real-time
speed control, faster
execution and extended non-
volatile memory life)
!C805
!C retains value in volatile
memory only
Auto-run
?S806
!S806
0
1
0 Decimal -
Run the nXDS Pump-System
from power-on:
Enable = 1
Disable = 0
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