Edwards nXR30i User manual
A73501860
Issue B
Instruction Manual
Serial Comms Interface
Description Item Number Description Item Number
nXDS6i A73501983 nXR30i 100-127/200-240 V 1ph 50/60 Hz NW25 Inlet A90301983
nXDS10i A73601983 nXR40i 100-127/200-240 V 1ph 50/60 Hz NW25 Inlet A90401983
nXDS15i A73701983 nXR60i 100-127/200-240 V 1ph 50/60 Hz NW40 Inlet A90502983
nXDS20i A73801983 nXR90i 100-127/200-240 V 1ph 50/60 Hz NW40 Inlet A90602983
nXDS6iC A73502983 nXR120i 100-127/200-240 V 1ph 50/60 Hz NW40 Inlet A90702983
nXDS10iC A73602983
nXDS15iC A73702983
nXDS20iC A73802983
nXDS6iR A73503983
nXDS10iR A73603983
nXDS15iR A73703983
nXDS20iR A73803983
Original Instructions
Copyright notice
©Edwards Limited 2021. All rights reserved.
Trademark credits
Edwards and the Edwards logo are trademarks of Edwards Limited, Innovation Drive, Burgess Hill, West
Sussex RH15 9TW.
Disclaimer
The content of this manual may change from time to time without notice. We accept no liability for any
errors that may appear in this manual nor do we make any expressed or implied warranties regarding the
content. As far as practical we have ensured that the products have been designed and constructed to be
safe and without risks when properly installed and used in accordance with their operating instructions.
We accept no liability for loss of profit, loss of market or any other indirect or consequential loss whatso-
ever.
Product warranty and limit of liability are dealt with in our standard terms and conditions of sale or nego-
tiated contract under which this document is supplied.
You must use this product as described in this manual. Read the manual before you install, operate, or
maintain the product.
Page i
Contents
A73501860 Issue B
Contents
Section Page
1 Introduction ........................................................................................ 1
1.1 Scope of this manual.................................................................................................... 1
1.2 Description................................................................................................................ 1
2 Technical data ..................................................................................... 3
2.1 Logic interface ........................................................................................................... 3
3 Connection for serial control and monitoring................................................. 5
3.1 Serial connection ........................................................................................................ 5
3.2 Serial enable ............................................................................................................. 6
3.3 Serial protocol ........................................................................................................... 6
3.4 Message structure ....................................................................................................... 7
3.5 Command set............................................................................................................. 7
3.6 Operating the pump.................................................................................................... 12
3.6.1 Start the pump.......................................................................................................... 12
3.6.2 Standby speed........................................................................................................... 12
3.6.3 Stop the pump .......................................................................................................... 12
3.7 Multi-drop operation ................................................................................................... 13
3.7.1 Assigning a multi-drop address ....................................................................................... 14
3.8 Mixed parallel and serial operation.................................................................................. 15
3.9 Decoding status words ................................................................................................. 16
3.9.1 Decoding system status word ......................................................................................... 16
3.9.2 Decoding service status word......................................................................................... 19
2021-AVG-GCN-0034
A73501860 Issue B
Page ii
Contents
Illustrations
Figure Page
1 Start / Stop Control Diagram ........................................................................................... 1
2 Logic interface locations ................................................................................................ 2
3 Logic interface connections - RS232 serial control.................................................................. 5
4 Logic interface connections - RS485 serial control.................................................................. 6
5 RS485 multi-drop connections .........................................................................................13
6 Logic interface connection - mixed parallel and serial operation ...............................................15
Tables
Table Page
1 Logic interface connection pins ........................................................................................ 3
2 Logic interface technical data.......................................................................................... 4
3 Summary of the commands that can be sent to the pump......................................................... 8
4 Command abbreviations ................................................................................................11
5 Error codes ...............................................................................................................11
6 Hexadecimal conversion table.........................................................................................16
7 System status register 1 flags..........................................................................................17
8 System status register 2 flags..........................................................................................17
9 Warning register 2 flags ................................................................................................18
10 Fault register flags ......................................................................................................19
11 Service flags ..............................................................................................................20
Associated publications
Publication title Publication number
Vacuum Pump and Vacuum System Safety P40040100
nXDS Scroll Pump Instruction Manual A73501880
nXRi Instruction Manual A90301880
Page 1
Introduction
A73501860 Issue B
1 Introduction
1.1 Scope of this manual
This manual provides operational instructions for the Edwards serial communication protocol. Read this manual
before you attempt to operate your product using serial communication protocol.
For safety and operating information, please refer to the relevant product Instruction manual.
1.2 Description
The pump can be operated in four control modes:
None in Control Mode - Inactive control mode
Manual Control Mode - Active control mode
Parallel Control Mode - Active control mode
Serial Control Mode (including Serial Interlock) - Active control mode
The control mode is determined by the way the pump is started. All the control modes, and transitions between
them, are defined in Figure 1.
Note: The pump can only be stopped by the mode in which it was started.
Figure 1 - Start / Stop Control Diagram
This instruction manual details the connection and operation of the pump. The parallel, manual and none in control
modes are detailed within the main product instruction manual.
A73501860 Issue B
Page 2
Introduction
The pump can be connected directly to the RS485 or RS232 serial input on your control equipment or a PC, using a
suitable connector mating half (not supplied). Full serial control is realised by using the following two signal lines:
serial enable and RS232 / RS485 control inputs.
Figure 2 - Logic interface locations
A. nXDS scroll pump
B. nXRi roots pump
1. User interface panel
2. 15-way logic interface connection
Page 3
Technical data
A73501860 Issue B
2 Technical data
2.1 Logic interface
The connector has a male 15-way D-type logic interface connector located on the user interface panel (Figure 2, Item
2). The logic interface connector can be plugged directly into your control equipment or a PC using a suitable
connector mating half (not supplied). Refer to Table 1 for the logic interface pins for the electrical connections and
Table 2 for the interface technical data.
Table 1 - Logic interface connection pins
Pin Number Signal Use
1 Analogue Speed Enable-control Input Connect to Pin 2 (0 V) to enable analogue speed control via
Pin 9.
2 0 V Control Reference 0 V reference for ALL control and status signals listed within
this table.
3 START / STOP – Control Input Connect to Pin 2 (0 V) to START the pump system.
4 STANDBY – Control Input /
RS232 Rx / RS485 A-
Connect to Pin 2 (0 V) to enable STANDBY speed when the
SERIAL ENABLE control input is inactive.
5 Serial Enable – Control Input Connect to Pin 2 (0 V) to enable serial communications.
6 RS232 / RS485 – Control Input Default configuration is RS232 with Pin 6 unconnected.
Connect to Pin 2 (0 V) to enable RS485 serial
communications.
7 FAIL – Status Output /
RS232 Tx / RS485 B+
Logic HIGH when a fail / fault condition exists and the SERIAL
ENABLE control input is inactive.
8 0 V Control Reference 0 V reference for ALL control and status signals listed within
this table.
9 Analogue Speed – Control Input 0-10 V Analogue Input: 0 V = 0% Speed; +10 V = 100% Speed
10 Chassis / Screen Screen
11 +10 V Analogue Reference – Control
Output
+10 V analogue voltage reference output: 5 mA;
uni-polar output, diode protected.
12 Chassis / Screen Screen
13 Not Connected Unused control pin.
14 REMOTE – Control Input Connect to Pin 2 (0 V) to enable remote operation via Parallel
control mode.
15 NORMAL – Status output Logic LOW when the pump rotational speed is at normal
speed or above.
A73501860 Issue B
Page 4
Technical data
Table 2 - Logic interface technical data
Logic interface description
Connector*
*Mating half of connector not supplied
15-way D-type (male)
Start, serial enable and remote enable:
Enable control voltage: low (closed) 0 to 0.8 V d.c. (lOUT = 0.55 mA nominal)
Disable control voltage: high (open) 4 to 26.4 V d.c. (Internal pull up to 6.4 V nominal)
Standby control input:
Enable control voltage: low (closed) 0 to 0.8 V d.c. (lOUT = 0.3 mA nominal)
Disable control voltage: high (open) 4 to 26.4 V d.c. (Internal pull up to 3.2 V nominal)
Analogue and RS485 enable control inputs:
Enable control voltage: low (closed) 0 to 0.8 V d.c. (lOUT = 0.55 mA nominal)
Disable control voltage: high (open) 4 to 52.8 V d.c. (Internal pull up to 6.4 V nominal)
Analogue speed input 0 to 10 V d.c. directly proportional to the motor speed
e.g. 0 V = 0 Hz, 10 V = 30 Hz
Speed set accuracy ± 5% full scale
NORMAL status output:
Type Open collector transistor plus pull up resistor.
< Normal speed (default 80%) OFF (4.7 k pull up + diode to 12 V d.c.)
Normal speed ON (< 0.8 V d.c. sinking 10 mA)
Maximum current rating 10 mA
Maximum voltage rating 28.8 V d.c.
FAIL status output:
Type Open collector transistor plus pull up resistor.
Fail OFF (4.7 k pull up + diode to 12 V d.c.)
OK ON (< 0.8 V d.c. sinking 10 mA)
Maximum current rating 10 mA
Maximum voltage rating 28.8 V d.c.
Analogue 10 V reference + 10 V d.c. analogue voltage reference
Unipolar output with diode protection
Voltage accuracy ± 2%
Output current 5 mA for specified accuracy
Page 5
Connection for serial control and monitoring
A73501860 Issue B
3 Connection for serial control and
monitoring
The serial interface allows you to control the pump and to interrogate its operational status using a number of serial
commands. There is also a multi-drop mode that allows you to connect more than one pump to a single serial port
on your control system.
3.1 Serial connection
The pump can connect directly to the RS485 or RS232 serial input on your control equipment or a PC as shown in
Figure 3 and 4. In this configuration the PC is the serial link master and the pump is the slave. The RS232 serial link
is capable of operating reliably at distances up to 6m. The RS485 serial link is recommended to maintain reliable
serial communications at distances greater than 6m. Alternatively an interface circuit, external to the pump, may
be required to communicate using the RS232 serial link over longer distances.
The software in the pump is capable of operating with several pumps connected to a single serial link master. This
is referred to as multi-drop mode (refer to Section 3.7). The RS485 option is recommended for multi-drop mode.
To enable the RS485 option, link the RS485 input signal to the 0 V Control Reference (pin 6 to pin 2) of your logic
interface mating half.
Figure 3 - Logic interface connections - RS232 serial control
1. RS232 interface on control equipment or PC
2. Pump logic interface
A73501860 Issue B
Page 6
Connection for serial control and monitoring
Figure 4 - Logic interface connections - RS485 serial control
3.2 Serial enable
To send a serial message you must first activate serial enable. This is achieved by linking the serial enable input signal
(pin 5) to pin 2 of your logic interface mating half. We recommend that you incorporate this link into your serial
communications cable so that the serial enable is only activated when the serial cable is connected. When you
subsequently remove the cable, serial enable will become inactive.
Serial enable acts as an interlock for start commands sent over the serial interface. If the pump is running in serial
control mode (having been sent a serial start command) and the serial enable subsequently becomes inactive, the
pump will trigger a fail condition and will decelerate to rest. To clear this fail condition, you must re-activate the
serial enable and send a serial stop command.
3.3 Serial protocol
The serial interface link is set to 9600 Baud, 8 bits, 1 stop, no parity with no handshaking. The commands are made
up from printable ASCII characters. The maximum message size you can send is 80 characters, including start and end
characters.
All alphabetical characters must be sent in upper case format. Response may contain lower case characters.
Every complete command message you send will receive a response - either a status code or a data return. The pump
can only deal with 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.
1. RS485 interface on control equipment or PC
2. Pump logic interface
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