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245U-E Wireless Ethernet Modem User Manual

Rev Version 2.24

Figure 38  5 GHz Channel Selection

  NOTE  Some of the groups use Dynamic Frequency Selections (DFS). If using these DFS channels you 

need to be aware that there will be a minimum 60-second scan or monitoring that the radio must 

perform to check that there are no military or commercial radars using the same frequency. If a 

radar is detected, the radio must select another random channel and repeat the 60-second scan or 

monitoring. 

3.10 Advanced Radio Configuration

Some of the more advanced radio settings have been moved from the normal Radio configuration page in 

order to simplify the configuration process. Care should be taken when making changes to parameters on 

this page.

Figure 39

  Advanced Radio

Summary of Contents for 245U-E

Page 1: ...Aug 2019 245U E Wireless Ethernet Modem Version 2 24...

Page 2: ...tions This device may not cause harmful interference and This device must accept any interference received including interference that may cause undesired operation This device must be operated as sup...

Page 3: ...tion License Copyright C 2009 Elpro ELPRO is using a part of Free Software code under the GNU General Public License in operating the 245U E product This General Public License applies to most of the...

Page 4: ...module during these adjustments Equipment should carry clear markings to indicate remote or automatic operation For example This equipment is remotely controlled and may start without warning Isolate...

Page 5: ...Wireless Ethernet Data Frame 32 Packets Between Access Point and Client 32 240U E Compatibility 32 3 7 Security Menu 33 WEP 64 bit and 128 bit 33 Encryption Keys 1 to 4 33 Default WEP Key 34 Open or...

Page 6: ...gh Channel Utilization 79 4 3 Custom Survey 81 4 4 Throughput Test 84 Internal Throughput Test 84 Throughput and Repeaters 86 4 5 Statistics 86 Wireless Statistics 87 Client 88 Network Traffic Analysi...

Page 7: ...GHz channels The 245U E A uses a 5 GHz DSSS wireless transceiver and users must select appropriate channel and transmit power allowable in their country Check with your ELPRO representative for the p...

Page 8: ...ent Ethernet link Figure 2 shows a connection between two Ethernet devices using 245U E Ethernet modems In this example one 245U E is configured as an access point and the other as a client Figure 2 A...

Page 9: ...at the same time can be connected to an Ethernet devices or on a LAN Figure 5 Multiple Repeaters Multiple access points can be set up in a mesh network to provide multiple repeaters Bridge vs Router E...

Page 10: ...t acting as a router between LAN A and LAN B Alternatively the access point could be configured as a router The wireless link is then part of LAN B If more than two routers are required within the sam...

Page 11: ...245U E requires an antenna and a power supply 2 Power on the 245U E and make an Ethernet connection to your PC For detailed steps refer to 3 2 Configuring the Unit for the First Time 3 Set the 245U E...

Page 12: ...mitted in your country and whether you use separate transmit and receive antennas If using a 245U E G 2 4 GHz with a single antenna 10 km 6 miles can be achieved in USA Canada and Australia 4 W EIRP a...

Page 13: ...il coax cable approximately 6 dB of loss and an 8 dBi gain antenna would equate to approximately 2 dB of gain which is well below the 10 dB limit Using the 245U E with a 20 m 66 ft Cellfoil coax cable...

Page 14: ...ly taped to prevent ingress of moisture Moisture ingress in the coaxial cable is a common cause for problems with radio systems as it greatly increases the radio losses We recommend that the connectio...

Page 15: ...owing Yagi antenna with a main beam and orthogonal elements Directional radome which is cylindrical in shape Parabolic antenna A directional antenna provides high gain in the forward direction but low...

Page 16: ...sure that the antenna mounting bracket is well connected to ground earth Figure 12 Collinear Antenna 2 2 Power Supply The 245U E module can be powered from a 9 30 Vdc power supply The power supply sho...

Page 17: ...a host device as well as a PC terminal for configuration field testing and factory testing Communication is via standard RS232 signals The 245U E is configured as DCE equipment with the pinouts descr...

Page 18: ...S485 network should be wired as indicated in the diagram below and terminated at each end of the network with a 120 ohm resistor On board 120 ohm resistors are provided and may be engaged by operating...

Page 19: ...es a LED indicator which is green when the digital input is active that is when the input circuit is closed Provided the resistance of the switching device is less than 200 ohms the device will be abl...

Page 20: ...ilable channels for a suitable access point The client will attempt to establish a link with an access point only if it has matching SSID and encryption method and other compatible capabilities as ind...

Page 21: ...ll select the connection with the best signal level This functionality permits a client to have mobility while maintaining a link with the most suitable access point LED Indication The following table...

Page 22: ...6 will overlap into channels 3 4 5 7 8 and 9 If complete separation is required you can use channels 1 6 and 11 without any interference between the channels The 10 MHz channels are also separated by...

Page 23: ...access point within the same wireless range it is important that the access points are on channels that are as far apart as possible If there are two 20 MHz channel access points set them to channel 1...

Page 24: ...ring this period 2 If interference is detected the system selects another channel and repeats the channel availability check on the new channel the original channel is added to a list of channels with...

Page 25: ...aved NOTE Wireless operation is disabled when in SETUP mode Remember set the switch back to the RUN position and cycle power at the conclusion of configuration for resumption of normal operation Acces...

Page 26: ...n 3 Power up the 245U E module 4 On the PC open the Control Panel and then open Network Settings The following description is for Windows XP Earlier Windows operating systems have similar settings 5 O...

Page 27: ...the PC uses a proxy server ensure that Internet Explorer will bypass the proxy server for local addresses This option may be modified by opening Tools Internet Options Connections Tab LAN Settings Pro...

Page 28: ...is behavior in IE7 by selecting Tools Internet Options Advanced Security Warn about certificate address mismatch Method 2 Set 245U E Network Address to Match the Local Network For this method you will...

Page 29: ...ifconfig again Note that these changes are only temporary and if the module is reset the IP address will return to the normal default 192 168 0 XXX 7 Open Internet Explorer and ensure that settings wi...

Page 30: ...Mode Access Point or Client Bridge operation is assumed For router selection go to the Network page after Quick Start Default Gateway This is the address that the device will use to forward messages...

Page 31: ...dent upon the connected wired Ethernet device s Before connecting to an existing LAN consult the network administrator Default configuration of the module will be Client and Bridge When in Bridged mod...

Page 32: ...n be achieved using this method An 802 1x capable RADIUS server may already be deployed in a large scale network environment The 245U E can make use of this server reducing replication of user authent...

Page 33: ...ure set the region to Global Tranmit Power Level This allows adjustment of the radio power Do not set the radio power above the allowed setting for your country You can reduce the power for short rang...

Page 34: ...or more information Save Changes Save changes to non volatile memory The module will need to be restarted before the changes take effect Save Changes and Reset Save settings to non volatile memory and...

Page 35: ...s Mode and 4 Address Mode Addresses in a Wireless Ethernet Data Frame There are two Wi Fi communication modes 3 Address mode Layer 3 Bridge and 4 Address mode The modes have a slightly different way o...

Page 36: ...certain modes The following table shows compatible configurations If communicating with ELPRO 240U E Ethernet modems the 240U Es need to be configured with WDS 4 Address mode not the default 3 Addres...

Page 37: ...quires 10 hexadecimal digits and 128 bit WEP requires 26 hexadecimal digits For example 12 AB EF 00 56 for 64 bit encryption and 12 AB EF 00 56 15 6B E4 30 C8 05 F0 8D for 128 bit encryption Encryptio...

Page 38: ...to the station Station uses its own WEP key to encrypt the text based message and sends it back to the access point Access point then decrypts the message using its on WEP key and if the key matches i...

Page 39: ...arameter determines maximum time a client will still have access to the network after its user credentials have been revoked Enable Debug Must only be used during commissioning and only if requested b...

Page 40: ...nsfer a message from the wired port to the wireless port if it is required A bridge will forward all broadcast traffic between the wired and wireless ports If the wired network is busy with broadcast...

Page 41: ...uccessful at the lower rate the 245U E will attempt to increase to the next highest rate When a station connects to an access point the two devices negotiate a data rate based which is within the conf...

Page 42: ...p to 108 Mbps Only usable with other ELPRO 245U E A and G modules configured with the same turbo channel If using the Turbo mode feature all modems in the system will need to be configured with Turbo...

Page 43: ...Selection 245U E G Modem 2 4 GHz 802 11b g Selection is made by picking one of the channels from the drop down channel list If Auto is selected the modem will select the best channel based on signal...

Page 44: ...he radio must perform to check that there are no military or commercial radars using the same frequency If a radar is detected the radio must select another random channel and repeat the 60 second sca...

Page 45: ...ulatory EIRP threshold DTIM Period Access point only DTIM sets which beacon frames incorporate extra information for low power sleeping client devices Normally set this to 1 RTS Threshold Ready To Sen...

Page 46: ...should be at least 8 dB greater than the weakest RSSI of any connected modems otherwise communications may be lost For example if the interfering noise levels are around 80 dB you can raise the noise...

Page 47: ...select Create a new connection 2 In the New Connection Wizard click Next 3 Set up an advanced connection 4 Connect directly to another computer 5 Set PC as guest 6 Set the Connection Name 7 Select a...

Page 48: ...l Modbus client master to connect with a single Ethernet Modbus TCP server slave With the Modbus function the serial data is encapsulated within a TCP IP data frame and made available on the Ethernet...

Page 49: ...r into Modbus RTU queries and forwards these over the RS232 port to the slave When the serial response to the query arrives from the slave it is converted to a Modbus TCP response and forwarded via th...

Page 50: ...er of received bytes that will be buffered before a packet is sent via the network Listen Port Server Server only Enter the TCP port number on which the server must listen for incoming connections The...

Page 51: ...server the remote port to automatically connect to Modbus Server IP Address Enter the IP Address of the remote server the remote IP Address to automatically connect to RS 232 RS485 Modbus TCP RTU Conv...

Page 52: ...r example 224 0 1 1 5000 The SCADA then communicates with the remotes using TCP via the IP address of the multicast manager and the port selected in the configuration for example 5001 Figure 42 Multic...

Page 53: ...5U E can transfer I O to and from almost any combination of Modbus TCP or RTU devices The layout of the 245U E I O registers is summarized in the table below Each register is internally saved as a 16...

Page 54: ...y at the corresponding serial port see 3 11 Serial Port Configuration Modbus TCP client functionality allows a maximum of 100 mappings to be configured and a maximum of 25 different Modbus TCP servers...

Page 55: ...red with Modbus TCP server enabled and device ID set to 1 so that the Modbus TCP client at unit B can connect and read the status of the onboard digital input Unit C also has the Modbus TCP to RTU gat...

Page 56: ...lowing table describes the settings shown in Figure 48 Enable Modbus TCP Server Slave Select this checkbox to enable the onboard Modbus TCP server All Modbus TCP connections to the module IP address a...

Page 57: ...er I O to from Device ID Enter the Modbus device ID of the destination Modbus device Server IP Address Specify the IP address of the destination Modbus TCP server for the specified transaction Respons...

Page 58: ...int RSSI would need to be above 84 dB before it would change over In general the roam changeover threshold should be at least 6 dB otherwise changeovers could occur too frequently Roam Check Interval...

Page 59: ...in the roaming scan list in this case channels 1 4 and 6 and if any of the RSSI levels are greater than 84 dBm it will change to this access point 3 17 Repeaters WDS The range of a wireless network ca...

Page 60: ...anning Tree Protocol when network loops exist Important Notes All access points must be configured on the same fixed radio channel Auto Channel Selection must not be selected see the Radio Configurati...

Page 61: ...necting to other access points Point to Point Mode Specify the MAC address of an access point with which a fixed link will be established Usually only required for third party devices Encryption Selec...

Page 62: ...is accessible via the repeaters link from the configuration webpages Site B is acting as an access point for Site A and is a client to Site C Likewise Site C is acting as an access point for Site B a...

Page 63: ...oints Each access point then needs a separate connection to the next access point which is provided using the WDS virtual access points or stations Site B is acting as a virtual access point for Site...

Page 64: ...terfaces that you want spanning tree to select first and lower priority values to interfaces that you want spanning tree to select last If all interfaces have the same priority value the MAC address i...

Page 65: ...amples there are four WDS access points each with the possibility of having their own associated client and stations In both examples Sites A B C and D can all exchange data with each other The bridge...

Page 66: ...outing rule could be configured but it is easier to configure two routing rules as shown in the example in Figure 61 Figure 61 Site A Routing Rules The first routing rule specifies 192 168 5 0 as the...

Page 67: ...one next hop router is required the 245U E allows for up to 30 routing rules to be configured A routing rule specifies a destination network or host IP address and the corresponding next hop router to...

Page 68: ...be accessed by selecting the Routing link on any of the configuration webpages Up to 30 routing rules may be added to each 245U E Figure 64 Routing Rules The table below summarizes the configurable p...

Page 69: ...address of the message only The IP address filter checks both the source address and the destination address of the message If either address match then the rule is activated ARP filtering applies on...

Page 70: ...and whitelists In theory MAC filtering allows a administrators to permit or deny network access to hosts associated with the MAC address though in practice there are methods to circumvent this form of...

Page 71: ...llow devices with the IP addresses listed to communicate with the module and utilize the radio link All other devices are blocked Add Entry Add a row to the table of IP address filter rules Delete Ent...

Page 72: ...s the IP address will be unknown and so should be given a unique name 3 21 DHCP Server Configuration The 245U E is able to act as a DHCP server supplying IP addresses automatically to other DHCP clien...

Page 73: ...beyond a single traditional LAN to groups of LANs each identified with a different VLAN ID VID Using a VLAN you can group users by logical connections instead of physical location This can increase s...

Page 74: ...VLAN tagged frames To initiate VLAN bridge or router operation VLAN Aware mode must be enabled on the VLAN page Figure 67 VLAN Pass through When VLAN Aware is enabled a default Management VLAN Group...

Page 75: ...characters This parameter is descriptive only and serves no functional purpose VLAN ID A valid 12 bit IEEE802 1Q VID with a range of 1 4095 The VLAN ID will be added to all outgoing VLAN tagged frame...

Page 76: ...ace from the drop down list to be used for the VLAN group Available interfaces are Ethernet Wireless or one of the 10 WDS Repeater connections that correspond to configured entries on the Repeaters pa...

Page 77: ...untagged devices on the VLAN trunk Figure 70 Example 1 Configuration Example 2 Multiple Wireless Interfaces Another very desirable VLAN configuration for a wireless device is to support multiple virt...

Page 78: ...VLAN trunk Untagged data transferred via the first Wireless interface wi0 is internally bridged with the virtual interface VLAN ID 10 Likewise untagged data transferred via the other two WDS repeater...

Page 79: ...is configured as untagged to allow connection from untagged devices VLAN Group 2 is using the standard wireless interface which is configured from the main Network page while the other two are each us...

Page 80: ...less interface parameters as configured on the Network page Likewise if the router IP and subnet are left blank the connection will use the same default settings NOTE Router IP and subnet do not need...

Page 81: ...is password if you change it as it will be needed to access the module in future Device Name A label for the particular 245U E This is also the DNS name hostname of the device if you are using DNS Own...

Page 82: ...k setting of IP address 192 168 0 1 netmask 255 255 255 0 7 Open the Configuration webpage within Internet Explorer at https 192 168 0 1XX where XX is the last two digits of the module s serial number...

Page 83: ...t IP address 192 168 0 1 Devices on LAN A that only require access to devices on LAN A and B should have their gateway IP address set to the 245U E access point as 192 168 0 200 Devices on LAN A that...

Page 84: ...h to RUN 16 Click Save to Flash and Reset The webpage displays a message indicating that details are being written to flash Wait for the 245U E to reboot before removing power 17 Enter a System Genera...

Page 85: ...www elpro com au 245U E Wireless Ethernet Modem User Manual 85 Rev Version 2 24 Figure 77 Example Repeaters...

Page 86: ...f and input is open circuit The green OK LED on the front panel indicates correct operation of the unit This LED turns red on failure as described above When the OK LED turns red shutdown state is ind...

Page 87: ...ng the Connectivity webpage it is necessary to hold down the CTR key while pressing the Refresh button otherwise the information will not be updated Connected Devices Figure 78 Connected Devices MAC A...

Page 88: ...be viewed individually on the Custom Survey page Channel utilization is logged by the radio for three separate time intervals every second for the last 60 seconds every minute for the last 60 minutes...

Page 89: ...le Iperf was running is seen to be high then this will confirm that the poor throughput was due to other RF interference Alternatively if the channel utilization is seen to be low indicating little in...

Page 90: ...re 80 Channel Utilization Figure 81 shows the radio receive noise floor for the last 60 seconds Figure 81 RX Noise Floor Figure 82 shows the average Channel Utilization for each minute up to one hour...

Page 91: ...iod 4 3 Custom Survey Custom Survey is essentially the same as the Channel Survey see the previous section except that the three channel utilizations can be turned on or off to show the different amou...

Page 92: ...using the selected criteria and time interval seconds minutes or hours Example 1 Chart one shows the amount of data that is being transmitted over a Wi Fi link Chart two shows the amount of data bein...

Page 93: ...er Manual 93 Rev Version 2 24 Figure 85 Custom Survey 2 With this sort of outside interference it is recommended to perform the same test but over a longer period so as to get a clearer indication of...

Page 94: ...ause of the additional load placed on the internal microprocessor Even so the throughput results still give an excellent indication of link performance as long as you compare the measured result again...

Page 95: ...enabled and reset the module Each time you click Measure Throughput a 10 second TCP throughput test is performed You will see the message Performing Iperf Test and if you look at the modules you will...

Page 96: ...est The Iperf throughput results provide an excellent measure of the performance of a radio link In general if the results you get are much worse than the best case values listed below it is a certain...

Page 97: ...10 5 0 2 5 1 3 7 0 3 5 1 8 0 9 4 7 2 4 1 2 0 6 3000m Ext 15 7 5 3 8 1 9 9 0 4 5 2 3 1 1 6 0 3 0 1 5 0 8 5000m Int 9 4 5 2 3 1 1 6 0 3 0 1 5 0 8 4 5 2 3 1 1 0 6 5000m Ext 13 6 5 3 3 1 6 8 0 4 0 2 0 1...

Page 98: ...ns unable to be sent 100 msec intervals due to interference or CCA Beacon Missed Reset Count After 15 consecutive beacon misses 1 5 seconds this count will increment by 1 This will indicate high inter...

Page 99: ...ring traffic on the wired Ethernet a better idea of regular traffic can be gained Network analysis programs make configuration of a filter for the 245U E a simple task 4 6 System Tools The System Tool...

Page 100: ...the units while remote webpages are opened Iperf Throughput Test A more thorough test of radio paths is a throughput test which will check the amount of data that can be reliably achieved via the wire...

Page 101: ...rong RSSI indication threshold RSSI Weak Threshold Weak RSSI indication threshold Enable Throughput Test Enables or disables the throughput test independent of radio path test RSSI Remote Device IP Ad...

Page 102: ...d the RS485 LED will be red If the measured throughput is less than the Throughput Low Threshold the RS485 LED will be off The radio path test can be accesses by selecting the link from the System Too...

Page 103: ...ish to modify and draw a tree diagram if necessary Modify the modules at the leaf nodes of your tree diagram These will be the furthest away from your connection point in terms of the number of radio...

Page 104: ...e access point 5016 STA Only Wireless adapter wi0 MAC address of the access point 5020 5026 As per 5010 5016 As per registers 5010 5016 but for the next wireless adapter wi1 5030 5036 As per 5010 5016...

Page 105: ...ram that lets you verify that a particular IP address exists and can accept requests Ping is used diagnostically to ensure that a host computer or device that you are trying to reach is actually opera...

Page 106: ...mand is used to repeatedly ping the specified node in the network To cancel press CTRL C A good test for the network once it is first set up is to use ping repeatedly from one PC s IP address to the o...

Page 107: ...h it is connected Other ipconfig commands will return more information The hardware or MAC address of the computer may be discovered using the command ipconfig all command The command ipconfig lists a...

Page 108: ...is required In the example in Figure 99 a routing rule needs to be entered into the Network A s PC which will allow access between Network A and Network B This can be entered at the command prompt usi...

Page 109: ...says access everything on network B 192 168 2 0 with the mask of 255 255 255 0 on Network A via the Ethernet IP interface 192 168 0 191 IP address 192 168 2 0 will allow everything on this network to...

Page 110: ...45U E G1 Input Output Discrete I O Input Voltage Free Contact 5 Output FET 30 Vdc 500mA 5 Ethernet Port Ethernet Port 10 100baseT RJ45 Connector IEEE 802 3 Link Activity Linkc 100baseT via LED Serial...

Page 111: ...5U E G 245U E A Only Safety IEC 60950 RoHS Compliant UL UL Listed General Size 4 5 x 5 5 x 1 2 114 mm x 140 mm x 30 mm Housing Powder Coated Aluminum Mounting DIN Rail Terminal Blocks Removable Max co...

Page 112: ...112 www elpro com au 245U E Wireless Ethernet Modem User Manual Rev Version 2 24...

Page 113: ...devices as much as possible If necessary create a temporary separate radio network to perform the upgrade to remote modules Web based Upgrade Web based firmware upgrades are available from the System...

Page 114: ...work This reduces traffic on the entire network Collision Avoidance A network node procedure for proactively detecting that it can transmit a signal without risking a collision with transmissions from...

Page 115: ...letters and or numbers series that enables data to be encrypted and then decrypted so it can be safely shared among members of a network WEP uses an encryption key that automatically encrypts outgoing...

Page 116: ...e UDP IP IPX is a datagram protocol used for connectionless communications Higher level protocols such as Sequenced Packet Exchange SPX and NCP are used for additional error recovery services SPX is a...

Page 117: ...ove network operations and security a proxy server is able to prevent direct communication between two or more networks The proxy server forwards allowable data requests to remote servers and or respo...

Page 118: ...nsmitted to multiple networks subnets within an organization or worldwide VoIP Voice over Internet Protocol VoIP Voice transmission using Internet Protocol to create digital packets distributed over t...

Page 119: ...f world 6 2437 Yes Yes Yes Yes Yes 802 11a Maximum Radio Transmitter Power Channel Freq MHz Europe Max TX Power Master Europe Max TX Power Slave Australia Max TX Power NZ Max TX Power USA Max TX Power...

Page 120: ...stralia max NZ max USA max 42 5210 23 dBm 23 dBm 23 dBm 23 dBm 17 dBm 152 5755 n a n a 26 dBm 26 dBm 26 dBm 160 5795 n a n a 26 dBm 26 dBm 26 dBm 802 11a and TX Power Band Frequency EU South Africa US...

Page 121: ...application from the link http sourceforge net projects iperf and save to a location on your PC 2 Extract the zip file to the ROOT directory C on your PC The extracted folder contains the main Iperf a...

Page 122: ...iperf command to start the client communication to the server iperf c IP address of Server PC w 65535 See Figure 102 Figure 102 iperf c Command This will run a test over the Wi Fi link to the server...

Page 123: ...e for the client mapping you established the server IP address followed by the w 65535 where w is the window size and the maximum TCPIP window size is 65535 bytes Another entry that can be added is t...

Page 124: ...ears select the Client option and enter the IP address of the server PC Leave the Port as the default and click Run Iperf The test will run again and the bandwidth throughput display will show results...

Page 125: ...1 b EMC EN 301 489 17 V2 2 1 Electromagnetic compatibility and Radio spectrum Matters ERM ElectroMagnetic Compatibility EMC standard for radio equipment Part 17 Specific conditions for Broadband Data...

Page 126: ...ompatibility and Radio spectrum Matters ERM ElectroMagnetic Compatibility EMC standard for radio equipment Part 17 Specific conditions for Broadband Data Transmission Systems 3 2 Radio EN 300 328 V1 9...

Page 127: ...f you distribute copies of the software or if you modify it For example if you distribute copies of such a program whether gratis or for a fee you must give the recipients all the rights that you have...

Page 128: ...r any part thereof to be licensed as a whole at no charge to all third parties under the terms of this License c If the modified program normally reads commands interactively when run you must cause i...

Page 129: ...py the source code from the same place counts as distribution of the source code even though third parties are not compelled to copy the source along with the object code 4 You may not copy modify sub...

Page 130: ...the body of this License 9 The Free Software Foundation may publish revised and or new versions of the General Public License from time to time Such new versions will be similar in spirit to the prese...

Page 131: ...TY TO USE THE PROGRAM INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROG...

Page 132: ...ia Telephone Global 61 7 3352 8600 USA 1855 443 5776 sales elpro com au www elpro com au 2018 ELPRO Technologies All Rights Reserved Publication No EL 245U E Aug 2019 ELPRO Technologies is a registere...

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