stop command has been received by the pump can any commands sent through the
parallel interface be acted on.
If you use the start switch on the parallel interface to start the pump, you cannot stop
the pump by sending a stop command over the serial interface. To stop the pump, use
the parallel stop switch. The serial interface accepts the start or stop commands only
when you use the parallel interface switch to stop the pump.
Figure 16 Logic interface connection - mixed parallel and serial operation
1. RS232 interface on control equipment
2. 24 V d.c. electrical supply
3. Fuse
4. Optional LED indicator
‑
system OK
5. Optional LED indicator
‑
normal speed
6. Current limit resistor for LED
7. Optional serial link selector
8. pump
9. Optional voltmeter
10. Optional serial enable switch
11. Optional standby switch
12. Start switch
1. RS232 interface on control equipment
2. 24 V d.c. electrical supply
3. Fuse
4. Optional LED indicator
‑
system OK
5. Optional LED indicator
‑
normal speed
6. Current limit resistor for LED
7. Optional serial link selector
8. pump
9. Optional voltmeter
10. Optional serial enable switch
11. Optional standby switch
12. Start switch
Note:
The voltage supply to the pump controller can be more than 24 V. But the circuits
connected to the normal and fail line must have maximum external pull
‑
up voltage
rating as given in
Table: Logic interface technical data on page 27
.
Page 51
B85200880_D - Installation
