© Edwards Limited 2012. All rights reserved. Page 17
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Connection for serial control and monitoring
A735-01-860 Issue A
Each binary digit (bit) represents a flag that is either active (state 1) or not active (state 0). To help decode each of
the system status words, each bit is numbered (starting with 0 for the least significant to 15 for the most significant),
as shown below:
The following 4 tables each contain a list of the 16 status flags that will be used for decoding the status or fault
finding for the nXDS pump. Table 7 contains the 16 flags used to decode the 'System status register 1', Table 8
contains the 16 flags used to decode the 'System status register 2', Table 9 contains the 16 flags used to decode the
'Warning register' and Table 10 contains the 16 flags used to decode the 'Fault register'.
System status regis
0000000000100010
1
5
1
4
1
3
1
2
1
1
1
0
9876543210
Table 7 - System status register 1 flags
Bit Status Flag Active Flat Meas
0 (lsb) Deceleration Stop command received and pump-controller is in the deceleration/
ramp down process
1 Acceleration/running Accelerating or running
2 Standby speed Standby active
3 Normal speed Above normal speed
4 Above ramp speed Operating above the ramp speed threshold
5 Above overload speed Operating above the overload speed threshold
6 Control mode Bits 6, 7 and 13 indicate which control mode the pump-controller is
operating in (bit 13; bit 7; bit 6).
000=none; 001=serial; 010=parallel; 011=manual
100...111=reserved
7
8Reserved-
9Reserved-
10 Serial enable Serial enable active
11 Reserved -
12 Reserved -
13 Control mode Used in conjunction with bits 6 and 7 above
14 Reserved -
15 (msb) Reserved -
Table 8 - System status register 2 flags
Bit Status Flag Active Flat Meas
0 (lsb) Upper power regulator active Power limit is active - i.e. pump operating on power limit
1 Lower power regulator active Acceleration is limited to manage link voltage
2 Upper voltage regulator active Deceleration is limited to manage link voltage
3Reserved-
4 Service due Service is due - See hours counters to identify what needs replacing
or use command ?V826
5Reserved-
6 Warning Warning condition - See 'Warning register' for detail
7 Alarm Fault condition - See 'Fault register' for detail
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