Pfeiffer Vacuum ASM 340 User manual

OPERATING INSTRUCTIONS
EN
Translation of the Original
37-PIN INPUT/OUTPUT BOARD
Communication interface

Disclaimer of liability
These operating instructions describe all models and variants of your product. Note that your
product may not be equipped with all features described in this document. Pfeiffer Vacuum
constantly adapts its products to the latest state of the art without prior notice. Please take
into account that online operating instructions can deviate from the printed operating
instructions supplied with your product.
Furthermore, Pfeiffer Vacuum assumes no responsibility or liability for damage resulting from
the use of the product that contradicts its proper use or is explicitly defined as foreseeable
misuse.
Copyright
This document is the intellectual property of Pfeiffer Vacuum and all contents of this
document are protected by copyright. They may not be copied, altered, reproduced or
published without the prior written permission of Pfeiffer Vacuum.
We reserve the right to make changes to the technical data and information in this document.
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Table of contents
1 About this manual 5
1.1 Validity 5
1.1.1 Products concerned 5
1.1.2 Applicable documents 6
1.2 Target group 6
1.3 Conventions 6
1.3.1 Instructions in the text 6
1.3.2 Abbreviations 6
2 Safety 7
2.1 General safety information 7
2.1.1 Safety instructions 7
2.1.2 Precautions 8
2.2 Intended use 8
2.3 Foreseeable misuse 8
3 Installation 9
3.1 Receipt of the product 9
3.2 ASM 340 9
3.2.1 Removal of the communication interface 9
3.2.2 Installation of the new communication interface 10
3.3 ASM 390-392 11
3.3.1 Removal of the communication interface 11
3.3.2 Installation of the new communication interface 13
3.4 ASM 306S 14
3.4.1 Removal of the communication interface 14
3.4.2 Installation of the new communication interface 16
4 Connection 18
4.1 Cable characteristics 18
4.2 Connection interface 19
5 Command via I/O communications interface 20
5.1 Save 20
5.2 Quick View 20
5.3 Analog Output 20
5.4 Formulas 22
5.5 Digital input 24
5.6 Digital Output 26
5.7 Selection of default configuration (Select Default Config.) 30
5.8 Other Configurations 31
5.9 Loading a configuration (Load Config from SD Card) 36
5.10 Internal 24 VDC or external 24 VDC power supply 36
5.11 Additional equipment 37
5.11.1ASM 142 type I/O cable 37
5.11.2ASM 182 type I/O cable 37
5.11.3Type HLT I/O module 37
5.11.4Type ASI 20 MD I/O module 37
5.11.5Type 2xxx or 3xxx I/O module 37
6 Configuration (USB - Ethernet) 38
6.1 Allocation of Serial Link 1 and Serial Link 2 38
6.2 MAC address 39
7 Command via USB 40
7.1 Configuration 40
7.2 Driver installation 40
Table of contents
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8 Command via Ethernet 41
8.1 Configuration 41
8.2 Program and driver installation 41
8.3 Uninstall 43
9 Malfunctions 44
10 Decommissioning 45
10.1 Disposal 45
10.2 Electrical and Electronic Equipment (EEE) 45
11 Spare parts 46
11.1 ASM 340 46
11.2 ASM 390/392 46
11.3 ASM 306S 46
11.4 ASI 35 46
Table of contents
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1 About this manual
IMPORTANT
Read carefully before use.
Keep the manual for future consultation.
1.1 Validity
This operating instructions is a customer document of Pfeiffer Vacuum. The operating instructions de-
scribe the functions of the named product and provide the most important information for the safe use of
the device. The description is written in accordance with the valid directives. The information in this op-
erating instructions refers to the product's current development status. The document shall remain valid
provided that the customer does not make any changes to the product.
1.1.1 Products concerned
This document applies to products with the following part numbers.
ASM 340
Description Part Number
ASM 340 Wet - 37-pin I/O - USB JSVA0xA2Mx9x
ASM 340 Wet - 37-pin I/O - USB - Ethernet JSVA0xA4Mx9x
ASM 340 Dry - 37-pin I/O - USB KSBA0xA2MM9A
ASM 340 Dry - 37-pin I/O - USB - Ethernet KSBA0xA4MM9A
ASM 340 Integrable - 37-pin I/O - USB MSXA0xA2MM9A
ASM 340 Integrable - 37-pin I/O - USB - Ethernet MSXA0xA4MM9A
Accessory - 37-pin I/O communication interface board 121350S
Accessory - 37-pin I/O communication interface board - USB - Ether-
net
121352S
ASM 390/392
Description Part Number
ASM 390 - 37-pin I/O - USB CSGB01G2MM9x
ASM 390 - 37-pin I/O - USB - Ethernet CSGB01G4MM9x
ASM 392 - 37-pin I/O - USB ESGB02G2MM9X
ASM 392 - 37-pin I/O - USB - Ethernet ESGB02G4MM9X
Accessory - 37-pin I/O communication interface board 126254
Accessory - 37-pin I/O communication interface board - USB - Ether-
net
126255
ASM 306S
Description Part Number
ASM 306S - 37-pin I/O - USB RSAS00A2MM9A
ASM 306S - 37-pin I/O - USB - Ethernet RSAS00A4MM9A
Accessory - 37-pin I/O communication interface board 127258S
Accessory - 37-pin I/O communication interface board - USB - Ether-
net
127256S
ASI 35
Description Part Number
ASI 35 - 37-pin I/O - USB Sxxx0x02MM9A
ASI 35 - 37-pin I/O - USB - Ethernet Sxxx0x04MM9A
37-pin I/O communication interface kit - USB 123057S
37-pin I/O communication interface kit - USB - Ethernet 123058S
About this manual
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1.1.2 Applicable documents
Documents relevant for the use of options and/or accessories, and for product maintenance are the fol-
lowing:
Document Part Number 1)
Operating instructions - ASM 340 leak detector 121762
128863
Operating instructions - ASM 390/392 leak detector 126348
Operating instructions - ASM 306S leak detector 127443
Operating instructions - ASI 35 leak detector 127801
Operating instructions - RS-232 Serial link 122215
1) also available at www.pfeiffer-vacuum.com
1.2 Target group
This user manual is intended for all persons in charge of transport, installation, commissioning/decom-
missioning, use, maintenance or storage of the product.
The work described in this document must only be carried out by persons with suitable technical training
(specialized staff) or persons who have undergone Pfeiffer Vacuum training.
1.3 Conventions
1.3.1 Instructions in the text
Usage instructions in the document follow a general structure that is complete in itself. The required ac-
tion is indicated by an individual step or multi-part action steps.
Individual action step
A horizontal, solid triangle indicates the only step in an action.
►This is an individual action step.
Sequence of multi-part action steps
The numerical list indicates an action with multiple necessary steps.
1. Step 1
2. Step 2
3. ...
1.3.2 Abbreviations
I/O Input/Output
[XXXXXX] The control panel menus and parameters are shown in bold between square brackets.
Example: [Advanced] [Input/Output] to select the Input/Output menu.
The screenshots are given as an example only. They can vary according to the user setting.
About this manual
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2 Safety
2.1 General safety information
The following 4 risk levels and 1 information level are taken into account in this document.
DANGER
Immediately pending danger
Indicates an immediately pending danger that will result in death or serious injury if not observed.
►Instructions to avoid the danger situation
WARNING
Potential pending danger
Indicates a pending danger that could result in death or serious injury if not observed.
►Instructions to avoid the danger situation
CAUTION
Potential pending danger
Indicates a pending danger that could result in minor injuries if not observed.
►Instructions to avoid the danger situation
NOTICE
Danger of damage to property
Is used to highlight actions that are not associated with personal injury.
►Instructions to avoid damage to property
Notes, tips or examples indicate important information about the product or about this docu-
ment.
2.1.1 Safety instructions
All safety instructions in this document are based on the results of the risk assessment carried out in
accordance with Low-Voltage Directive 2014/35/EU regarding electrical safety. Where applicable, all life
cycle phases of the product were taken into account.
WARNING
Risk of electric shock in case of contact with products that are not electrically isolated
When powering off _mains switch to O_, certain components located between the mains connection
and the circuit breaker will still contain an electric charge (live). There is a risk of electric shock in
case of contact.
►Make sure that the mains connection is always visible and accessible so that it can be unplugged
at any time.
►Disconnect the mains cable from the electrical network before working on the product.
►Wait for the control panel screen to turn off completely before working on the product and/or re-
moving the cover(s).
NOTICE
Risk of electromagnetic disturbance
Voltages and currents can induce a multitude of electromagnetic fields and interference signals. In-
stallations that do not comply with the EMC regulations can interfere with other equipment and the
environment in general.
►Use shielded cables and connections for the interfaces in interference-prone environments.
Safety
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NOTICE
Safety extra-low voltage circuits
The remote control circuits are equipped with dry contact outputs (30 V - 40 A max). Overvoltages
and overcurrents can result in internal electrical damage. Users must observe the following wiring
conditions:
►Connect these outputs in compliance with safety extra-low voltage (SELV) circuit rules and safety
standards.
►The voltage applied to these contacts should be less than 30 V and the current less than 40 A.
2.1.2 Precautions
Duty to provide information on potential dangers
The product holder or user is obliged to make all operating personnel aware of dangers
posed by this product.
Every person who is involved in the installation, operation or maintenance of the product
must read, understand and adhere to the safety-related parts of this document.
Infringement of conformity due to modifications to the product
The Declaration of Conformity from the manufacturer is no longer valid if the operator
changes the original product or installs additional equipment.
●Following the installation into a system, the operator is required to check and re-evalu-
ate the conformity of the overall system in the context of the relevant European Direc-
tives, before commissioning that system.
Only qualified personnel trained in safety regulations (EMC, electrical safety, chemical pollution) are au-
thorized to carry out the installation and maintenance described in this manual. Our service centers can
provide the necessary training.
►Follow the safety and accident prevention requirements (see chapter “Safety instructions”).
►Do not turn on the product if the cover is not in place.
2.2 Intended use
The communication interface is intended to be integrated into a leak detector from the manufacturer
Pfeiffer Vacuum (see chapter “Products concerned”).
The communication interface enables the leak detector to communicate with a PLC (at the customer's
expense).
The communication interface must be used in conjunction with the leak detector operating instructions
(see chapter "Applicable documents").
2.3 Foreseeable misuse
Misuse of the product will render the warranty and any claims void.
Any use, whether intended or not, that diverges from the uses already mentioned will be treated as non-
compliant.
Safety
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3 Installation
3.1 Receipt of the product
Condition of the delivery
●Check that the product has not been damaged during transport.
●If the product is damaged, take the necessary measures with the carrier and notify the
manufacturer.
►Keeping the product in its original packaging so it stays as clean as it was when dispatched by us.
Only unpack the product once it has arrived at the location where it will be used.
Keep the packaging (recyclable materials) in case the product needs to be transported or
stored.
3.2 ASM 340
To install the “Communication interface board” accessory, it is necessary to remove the communication
interface already installed in the leak detector in order to replace it with the accessory instead.
3.2.1 Removal of the communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
WARNING
Risk of crushing during product handling
Considering the weight of the leak detector in which the accessory is to be installed, there is a risk of
crushing when handling the leak detector. Under no circumstances shall the manufacturer be liable if
the following instructions are not followed:
►Only qualified staff trained in handling heavy objects are authorized to handle the product.
►The lifting devices must be used on the leak detector and follow the procedures (see chapter
"Handling" of the leak detector operating instructions).
3
2
1
A
5 4
1 24 VDC supply connector 4 Supervisor board
2 J2 connector 5 J9 connector
3 J1 connector
Installation
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1 2
B
1 Fixing screws 2 Support plate
1. Switch off the leak detector (see chapter “Shutdown the detector” in the detector operating instruc-
tions).
2. Remove the front cover of the detector (see leak detector maintenance manual).
3. Disconnect connectors J1, J2 and J9 from the supervisor board (see [A]).
–There are no J2 connectors for the 15-pin I/O board
4. Disconnect the 24 VDC supply (see [A]).
5. Move the detector over the edge of the work surface.
6. Remove the 5 fixing screws from the support plate located below the leak detector (see [B]).
3.2.2 Installation of the new communication interface
Composition of a 37-pin I/O interface board kit
●1 support plate equipped with the 37-pin I/O board and a label
●5 screws and 5 washers to fix the plate on the detector
●1 37-pin male D-Sub connector to prepare the connection cable (at the customer’s expense)
●1 operating instructions for the 37-pin I/O communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
1
A
1 Support plate
Installation
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3
2
1
B
5 4
1 24 VDC supply connector 4 Supervisor board
2 J2 connector 5 J9 connector
3 J1 connector
1. Remove the communication interface (see chapter “Removal of the communication interface”).
2. Install in place of the new support plate equipped with the I/O board (see [A]).
3. Place the wiring harnesses under the supervisor board of the new communication interface (see
[B]).
4. Replace the 5 screws and washers.
5. Connect the connectors J1, J2 and J9 of the I/O board to the supervisor board (see [B]).
–There are no J2 and J9 connectors for the 15-pin I/O board
6. Connect the 24 VDC supply (see [B]).
7. Stick the label supplied in the kit on the detector frame if the I/O board is equipped with an Ether-
net module.
8. Set the USB port (see chapter “Command via USB”).
9. Set the Ethernet module if the I/O board is equipped with the module (see chapter “Command via
Ethernet”).
3.3 ASM 390-392
To install the “Communication interface board” accessory, it is necessary to remove the communication
interface already installed in the leak detector in order to replace it with the accessory instead.
3.3.1 Removal of the communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
WARNING
Risk of crushing during product handling
Considering the weight of the leak detector in which the accessory is to be installed, there is a risk of
crushing when handling the leak detector. Under no circumstances shall the manufacturer be liable if
the following instructions are not followed:
►Only qualified staff trained in handling heavy objects are authorized to handle the product.
►The lifting devices must be used on the leak detector and follow the procedures (see chapter
"Handling" of the leak detector operating instructions).
Installation
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1
3
2
A
1 Work surface 3 Exhaust
2 Rear panel
3
1
2
B
1 J2 connector 3 Ground connection
2 J1 connector
2
11
C
1 Fixing screws 2 Support plate
1. Switch off the leak detector (see chapter “Shutdown the detector” in the detector operating instruc-
tions).
2. Remove the work surface and the pump exhaust if installed (see [A]).
3. Remove the rear panel from the detector (see [A]).
4. Empty the storage box and remove the groundsheet.
5. Disconnect connectors J1 and J2 from the supervisor board (see [B]).
–There are no J2 connectors for the 15-pin I/O board
6. Remove the ground wire connecting the support plate to the detector frame (see [B]).
Installation
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7. Remove the 6 support plate fixing screws (see [C]).
–3 on the detector side,
–3 on the bottom of the storage box.
8. Pull the support plate horizontally to remove it (see [C]).
3.3.2 Installation of the new communication interface
Composition of a 37-pin I/O interface board kit
●1 support plate equipped with the 37-pin I/O board and a label
●6 screws and 6 washers to fix the plate on the detector
●1 37-pin male D-Sub connector to prepare the connection cable (at the customer’s expense)
●1 operating instructions for the 37-pin I/O communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
1
2
3
A
1 J2 connector 3 Ground connection
2 J1 connector
2
11
B
1 Fixing screws 2 Support plate
Installation
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3
2
14
C
1 J2 connector 3 Ground connection
2 J1 connector 4 Supply cable
1. Remove the communication interface (see chapter “Removal of the communication interface”).
2. Install in place of the new support plate equipped with the I/O board (see [A]).
–The support plate is introduced horizontally, the wiring harnesses and the ground connection
first: the wiring harnesses and the ground connection must come out.
3. Replace the 6 support plate fixing screws (see [B]):
–3 on the detector side,
–3 on the bottom of the storage box.
4. Connect connectors J1 and J2 from the I/O board to the supervisor board
5. Fasten the ground wire connecting the support plate to the detector frame (see [C]).
6. Connect the power supply cable.
7. Put the work plan, the rear panel and the groundsheet back in the storage box.
8. Stick the label supplied in the kit on the detector frame if the I/O board is equipped with an Ether-
net module.
9. Set the USB port (see chapter “Command via USB”).
10. Set the Ethernet module if the I/O board is equipped with the module (see chapter “Command via
Ethernet”).
3.4 ASM 306S
To install the “Communication interface board” accessory, it is necessary to remove the communication
interface already installed in the leak detector in order to replace it with the accessory instead.
3.4.1 Removal of the communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
WARNING
Risk of crushing during product handling
Considering the weight of the leak detector in which the accessory is to be installed, there is a risk of
crushing when handling the leak detector. Under no circumstances shall the manufacturer be liable if
the following instructions are not followed:
►Only qualified staff trained in handling heavy objects are authorized to handle the product.
►The lifting devices must be used on the leak detector and follow the procedures (see chapter
"Handling" of the leak detector operating instructions).
Installation
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6
1 2
5 4
3
A
7
1 24 VDC J6 supply connector 5 J2 connector
2 Grommet 6 J1 connector
3 Grommet 7 Supervisor board
4 Ground connection
1 2 3
B
The ground connection and the nut are not supplied with the kit. They must be removed
from the support plate of the old kit to be put back on the support plate of the new kit.
1 Ground connection with nut 3 Fixing screw with washers
2 Support plate
1. Switch off the leak detector (see chapter “Shutdown the detector” in the detector operating instruc-
tions).
2. Remove the front cover of the detector (see leak detector maintenance manual).
3. On the supervisor board, disconnect the wiring harness(es) from the communication interface
(connectors J1 and J2 depending on the configuration and connector J9) (see [A]).
4. Disconnect connectors J1, J2 and J9 from the supervisor board (see [A]).
–There are no J2 and J9 connectors for the 15-pin I/O board
5. Disconnect the 24 VDC power supply (J6) (see [A]).
6. Remove the ground wire connecting the support plate to the detector frame (see [A]).
Installation
15/48

7. Tilt the detector onto its rear face on the work surface (the side with the connectors facing the
user).
8. Remove the ground connection from the support plate (see [B]).
9. Remove the 5 support plate fixing screws and the washers (see [B]).
3.4.2 Installation of the new communication interface
Composition of a 37-pin I/O interface board kit
●1 support plate equipped with the 37-pin I/O board and a label
●5 screws and 5 washers to fix the plate on the detector
●1 37-pin male D-Sub connector to prepare the connection cable (at the customer’s expense)
●1 operating instructions for the 37-pin I/O communication interface
WARNING
Electric shock hazard
Voltage and current can cause electric shock.
Only skilled, authorized people may carry out maintenance work.
►Insulate and lock the power supply circuit by positioning the circuit breaker on O.
►Disconnect the power supply cable from all power sources before working on the product and/or
removing the covers.
1 2 3
A
The ground connection and the nut are not supplied with the kit. They must be removed
from the support plate of the old kit to be put back on the support plate of the new kit.
1 Ground connection with nut 3 Fixing screw with washers
2 Support plate
Installation
16/48

6
1 2
5 4
3
B
7
1 24 VDC J6 supply connector 5 J2 connector
2 Grommet 6 J1 connector
3 Grommet 7 Supervisor board
4 Ground connection
1. Remove the communication interface (see chapter “Removal of the communication interface”).
2. Place the ground connection on the new support plate (see [A]).
3. Install in place of the new support plate equipped with the I/O board (see [A]).
4. Place the wiring harnesses under the supervisor board of the new communication interface.
5. Replace the 5 support plate fixing screws and the washers (see [A]).
6. Position the detector, resting its feet on the work surface.
7. Connect the connectors J1, J2 and J9 of the I/O board to the supervisor board (see [B]).
–There are no J2 and J9 connectors for the 15-pin I/O board
8. Connect the 24 VDC supply (see [B]).
9. Replace the ground wire connecting the support plate to the detector frame (see [B]).
10. Stick the label supplied in the kit on the detector frame if the I/O board is equipped with an Ether-
net module.
11. Set the USB port (see chapter “Command via USB”).
12. Set the Ethernet module if the I/O board is equipped with the module (see chapter “Command via
Ethernet”).
Installation
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4 Connection
4.1 Cable characteristics
NOTICE
Risk of electromagnetic disturbance
Voltages and currents can induce a multitude of electromagnetic fields and interference signals. In-
stallations that do not comply with the EMC regulations can interfere with other equipment and the
environment in general.
►Use shielded cables and connections for the interfaces in interference-prone environments.
NOTICE
Safety extra-low voltage circuits
The remote control circuits are equipped with dry contact outputs. Overvoltages and overcurrents can
result in internal electrical damage. Users must observe the following wiring conditions:
►Connect these outputs in compliance with safety extra-low voltage (SELV) circuit rules and safety
standards.
►The voltage applied to these contacts should be less than 30 VDC and the current less than 1 A.
37-pin I/O communication interface
►Use a cable that conforms to I/O cable standards.
–37-pin male D-Sub connector and its cover, provided with the leak detector.
–Cable not provided, at the customer’s expense.
20
37
119
Leak detector 37-pin female D-Sub I/O connector
Input Logic Pins 11 - 12 - 13 - 30 - 31 - 32
Accessory Pins 34 - 35 - 15 - 16: reserved
Output Logic Pins 1 to 9 - 20 to 28
Analog Pins 19 - 36 - 37 (ground: 17 - 18)
Other 29-pin: +24 VDC internal or external 1)
10-pin: internal or external ground 1)
Pins 33 - 14: headphones (8 Ω) 2)
1) Depending on SW1 switch configuration.
2) Activation/deactivation for the headphone/audio output (see below)
Activation/deactivation for the headphone/audio output
1. Activation of the loudspeaker: send the command RS-232 ‘=HPE’ to the detector.
2. Deactivation of the loudspeaker: send the command RS-232 ‘=HPD’ to the detector.
USB
►Use a type A-B USB cable.
–Cable not provided, at the customer’s expense.
RS-232 serial link
►Use a cable (not supplied) that conforms to RS-232 cable standards.
–9-pin female D-Sub connector
►Refer to the operating instructions for the RS-232 serial link (see chapter “Applicable documents”).
Ethernet
►Connect a cable between the detector Ethernet port and the computer.
–Cable not provided, at the customer’s expense.
–As soon as the cable is connected, the USB module is detected.
Connection
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4.2 Connection interface
Refer to the leak detector operating instructions to locate the connection interface.
Before connecting the cable, switch off the leak detector (see chapter "Powering off" in the leak detector
maintenance instructions).
1 2 3 4
37-pin I/O communication interface
1Ethernet connector (depending on option)
2USB connector
39-pin male D-Sub RS-232 serial link connector
Refer to the operating instructions for the RS-232 serial link (see chapter “Applicable documents”).
437-pin female D-Sub I/O communication interface connector
Connection
19/48

5 Command via I/O communications interface
►From the “Settings” screen, press [Advanced] [Input/Output] [I/O Connector].
5.1 Save
Saving all of the configured I/O is automatically suggested when exiting the menu if a parameter has
been modified.
►Enter the name of the file and validate the save (“.IOP” file).
5.2 Quick View
►From the “Settings” screen, press [Advanced] [Input/Output] [I/O Connector] [Quick View].
Quick view makes it possible to view, for each I/O:
●connection pins
●allocation (function, setting, order)
●status (allocation and contact)
●activation mode.
4b
4b
4a
1
2
3
5
1
2
3
4a
Quick View description (example)
1 Allocated value 4a Contact dynamic status
2 Activation mode 4b Initial status of contact
3 Connection pins 5 Status
─ blue display = inactive
─ green display = active
5.3 Analog Output
Quantity Pin
3 37-gnd
36-gnd
19-gnd
Command via I/O communications interface
20/48