LEYBOLD ECODRY plus 25, Operating Instructions Manual

Page: 32 / 64

3. Stop the pump system with the appropriate control source:
▪ use the stop button in manual control mode, refer to Figure:
Interface control panel .
▪ use the start/stop control input in parallel control mode.
▪ use stop command in serial control mode.
4. Isolate the mains supply.
If the pump is to be stored, we recommend you either keep the pump under
vacuum or fill the pump with dry nitrogen to prevent condensation in the
pump. To keep the pump under vacuum, we recommend you seal the inlet
and run the pump for at least 20 seconds.
6.9 Restart the pump
If the pump is automatically shut down because of an alarm condition,
correct the alarm condition before you restart the pump. To restart the
pump, refer to
Start the pump on page 31.
6.10 X104 SUB-D9 (female) Serial RS-485 Interface
Alternatively, the X104 RS-485 interface can be used to operate and control
the pump in serial control mode.
Table 13 Pin assignment serial interface X104 (female)
Pin
Description Description
1 Not connected
2 T+ Termination
3 T- Termination
4 Not connected
5 Ground (GND)
6 R- Receive -
7 R+ R (Tx/Rx+)
Bridged internally to Pin 9
8 S- Send – (Tx/Rx-)
Bridged internally to Pin 6
9 S+ Send +
Housing Shield Grounded
6.11 MODBUS RTU Protocol
The MODBUS RTU Protocol specifies the serial communications interface
for the pumps. The serial communications interface is defined as follows:
▪ Half-duplex, RS-485, physical layer
▪ MODBUS RTU standard/open protocol
Throughout this section, all MODBUS addresses and values are specified
using the C notation for hexadecimal (0x). The word ‘character’ is used to
represent a 16-bit block of data.
300902516_002 - 10/2020 - © Leybold
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Operation