Interface RS485-WiFi

Interface RS485-WiFi v.1.0 CODE: EN Edition: 1st (6th Jan 2013)

CONTENTS 1. General description....2 2. Arrangement of the components....3 3. Installation...4 3.1 Main guidelines....4 3.2 Connecting to the RS485 bus....4 3.3 Installation of the interface...4 4. Configuration of the RS485-WiFi interface....6 4.1 Factory settings of the interface....6 4.2 Introductory information....6 4.3 STEP 1 Restoring the factory settings...6 4.4 STEP 2 Configuration of the IP address...7 4.5 STEP 3 Assigning the SSID identifier for Wi-Fi network....8 4.6 STEP 4 Selecting the communication mode....13 4.6.1 Communication in LAN/WAN...13 TCP Sockets profile settings...15 Setting the serial port...16 Settings in the PowerSecurity program...17 4.6.2 Communication in the WLAN serial bridge mode...19 Settings of the Serial Bridge profile Client/Server...19 Setting the parameters of the serial port.....19 Settings in the PowerSecurity program...20 5. Setting the communication parameters of the PSU...23 5.1 Configuration of the PSU with an LCD display...23 Stetting the address of the PSU....23 Setting the parameters of the serial port.....24 5.2 Configuration of the PSU with an LED display....25 Setting the address of the PSU.....25 Setting the parameters of the serial port.....25 6. Specifications...26 2

Features: operating in the Wi-Fi network compliant with the IEEE 802. 11b standard operation mode: full or half-duplex (auto-sensing) embedded web server for configuration data encryption: WEP, WPA, WPA2 operates with numerous popular protocols, e.g. TCP, UDP, DHCP assigning a static or dynamic IP address (DHCP server) operates in modes: virtual serial port, TCP outlet power supply 10 30V DC works with the PowerSecurity software LED indication hermetic enclosure IP65 warranty - 5 years form the date of production 1. General description. The RS485-WiFi interface is a device intended for converting signals between the RS485 bus and the Ethernet network and dedicated for working with power supply units of the PSBEN (Black Power) group connected to WLAN/WAN network. To work correctly, the device requires external power supply within the range of 10 30V DC e.g. drawn from a PSU of the PSBEN series. The device is mounted in a hermetic enclosure that protects it against adverse environmental conditions. The range of transmission in the Wi-Fi wireless network amounts to approx. 30m inside buildings and depends on its construction. Before using a communication system in the Wi-Fi network, make certain that the technical conditions of the dedicated place ensure stability of connection. 2. Arrangement of the components. The picture below shows the arrangement of the most important components and connectors of the RS485- WiFi interface. Fig.1. The view of the interface. 3

Table 1. Description of the components. Element Description no. LEDs optical indication: [1] PWR supply s voltage TX data transmission RX receiving data [2] RST button reset of the interface s settings [3] INIT button initiation of the interface [4] Antenna outlet RP-SMA Connector of the RS485 bus [5] A+, B- - RS485 data transmission SG - signal ground [6] Wi-Fi module. [7] Green LED network activity (transmitting or receiving) Wi-Fi module. Yellow LED active connection with the network [8] Power connector 10 30V DC [9] Wi-Fi antenna 3. Installation. 3.1 Main guidelines. During the installation of the RS485-WiFi interface, follow certain principles that will help to avoid electromagnetic interferences and incorrect operation of the device: - provide the interface with power from a source of low ripple factor - the main supply cable ought to be possibly shortest. - signal harnesses shall be led in min. 50 cm distance, the cuts between them are to be made at the angle of 90 - the location of the interface's installation must be distant from devices of significant impulse interferences, e.g. power invertors, contactors, relays. 3.2 Connecting to the RS485 bus. The RS485-WiFi interface is connected to the RS485 bus via the RS485 connector. Connect the wires of the RS485 bus to the A+, B- terminals of the connector. They are assigned in the same way and the connection is identical to the rest of devices (A+ to A+, B- to B-). Use a twisted-pair cable as a transmission wire of the bus. The bus shall be of a point-to-point topology, the star type of topology is to be avoided. If the bus wires are of a significant length it is recommended to use a shielded cable that will prevent from errors during communication and lowers the susceptibility to noise and emission of radio frequency interference. It is also advisable to mount termination resistors at the ends of the bus. Their resistance ought to be comparable to the impedance specific for the cable in use, i.e. 120 Ohm. 3.3 Installation of the interface. 1. In the enclosure, mount an isolation duct for a Wi-Fi antenna. 2. Lead the antenna through the isolation duct and then screw it carefully into the outlet of the module. Screw the nut tight to keep the enclosure airtight. 3. Lead the cable of the RS485 bus through the cable duct and the appropriate hole in the enclosure and then connect to the RS485 connector of the interface. The wires A+, B- must be connected identically in all devices, i.e. A+ to A+, B- to B-. In the shielded cables, the shield is to be connected to the terminal of signal ground SG. 4. Optional: mount 120 Ohm terminating resistors at the end of the RS485 bus. 5. Lead the supply cable through the cable duct and the appropriate hole in the enclosure and then connect it to the Power power connector. The power source shall deliver voltage from the range of 10-30V DC, e.g. from a power supply unit of the PSBEN group. The best solution is to use a PSU that is plugged into the RS485 bus and located close to the interface. 4

Fig.2. The view of the interface with a description of the wires. 5

4. Configuration of the RS485-WiFi interface. 4.1 Factory settings of the interface. Login page: Username - root Password - dbps IP address Acquired automatically from the DHCP database of the router Network s name (SSID) No name Connection with the Wi-Fi network Connection to a random available Wi-Fi network Network security No preset protection Communication parameters of a serial port No configuration 4.2 Introductory information. Parameters of the RS485-WiFi interface can be configurable in order to adjust them to the intended operation mode. The configuration is via web browser after correct logging, i.e. typing correctly username and password. The Digi Device Discovery program is also helpful as it allows previewing important parameters of the interface at the preliminary stage of the configuration. The application seeks out modules available at the range of a router and informs about the assigned IP address and MAC unique address. Download the Digi Device Discovery program from the following page: http://www.pulsar.pl/pl/pliki/digi_discovery.exe To perform the configuration of the RS485-WiFi interface, a minimal connection arrangement is to be set, as shown below: Fig. 3. A diagram of connections between the interface and a PC that enables performing the configuration. A newly purchased Wi-Fi interface is delivered with basic configuration (factory settings) which is not adjusted to correct operation in the system. As the communication with the interface is via radio waves, it is important to adjust your router accordingly so that it can establish connection with the interface. The most convenient solution is to own a separate router or to restore the factory settings of the one in use (if possible). If there is more than one Wi-Fi networks in the place where the configuration is being made, one can avoid communication interference by reducing the power the interface RS485-WiFi emits. To do so, unscrew the antenna of the interface and place it near the router with which it is going to be connected. In this manual, the configuration of the Wi-Fi interfaces has been based on a wireless 'LinkSys WRT54GL Wi-Fi router. 4.3 STEP 1 Restoring the factory settings. Router: To restore the factory settings of the router, check the device s manual and perform actions following the manufacturer s instructions. In most cases, the actions narrow down to finding the reset button at the back panel of the enclosure and holding it for approx. 5s. After releasing the button, wait approx. 1 min for the correct initiation of the router. The initiation restores the factory settings to: Address: 192.168.1.1 Username: admin Password: admin 6

RS485-WiFi interface: To restore the factory settings of the interface, press and hold the INIT button and then press and release the RESET button one time. Still holding the INIT button, wait approx. 20s during which the interface will be twinkling: 3 times with the yellow LED [7 fig. 1] and then 5 more times. Correctly performed initiation restores the interface s settings, among others, to: Address: assigned automatically by the router Username: root Password: dbps After restoring the factory settings of the router and the interface, the yellow LED of the interface [7 fig.1] should illuminate constantly indicating the correct logging process into an available Wi-Fi network. If the LED is still twinkling, it may be necessary to disconnect the module from the power supply and then switch it back on. If these actions prove insufficient, begin the procedure of restoring the router s and the interface s factory settings once again. 4.4 STEP 2 - Configuration of the IP address. To ensure a proper progress of the IP address changing procedure, it is recommended to turn off the firewall of the anti-virus program for the time of configuration process. If the yellow LED [7 - fig.1] is constantly illuminated, make certain whether the interface has logged into our router, not other s. Then, use the Digi Device Discovery program as help. First, run the program (Digi Device Discovery). After launching, the program will display the logged-in RS485-WiFi interface. Identification of our module can be done by comparing the MAC addresses. Fig. 4. The window of the Digi Device Discovery program showing a logged-in interface. The MAC address of the interface is underneath the barcode of the DIGI module. Fig. 5. The MAC address located on the DIGI module. 7

In order to facilitate the further use of the devices online, change the IP address assignment from automatic into manual. To make such adjustments, click the right button of the mouse on the line with selected interface and choose: Configure network settings. Fig. 6. The window of network settings. Select the option: Manually configure network settings in the window of network settings. From now on, the automatically assigned IP address will maintain the same on each connection. The automatically assigned IP connection may be left unchanged or be altered. If altered, be sure that the new address is not already taken and will not cause conflicts. Before setting the network address, make certain that none of the devices working in the network is using it and no address conflict is caused due to that fact.. Click the Save button to approve the changes. The Digi Device Discovery application will display a message about a required interface restart which shall be approved by clicking the OK button. Next, the window of device s resetting progress will appear. 4.5 STEP 3 Assigning the SSID identifier for Wi-Fi network. In this manual, the configuration of the Wi-Fi interfaces has been based on a wireless 'LinkSys WRT54GL Wi-Fi router. To make certain that the RS485-WiFi interface will be connected only to an appointed router, enter the network identifier. To do that, log into the interface s router configuration as follows: open the window of a web browser, type 192.168.1.1 in the address field (router s default address after a reset) and approve with the ENTER button. The page will load and the following window will appear: Fig. 7. The login window of the Wi-Fi router. To have access to the router s configuration, type: Username: admin Password: admin Approve your entries with the Login button. In no time, the window that enables adjustments will appear. 8

Choose the Wireless tab. Now, type the SSID network identifier which is the name of the network within which the Wi-Fi interfaces will be transmitting data to the computer. In the Wireless Network Name field, type any name, e.g. PowerSecurity. Other settings shall remain unchanged. Fig. 8. The window of changing the network identifier. Approve the implemented changes by clicking the Save Settings button, and then approve by clicking Continue. The router will get reset. Meanwhile one will observe a momentary power loss of the interface indicated by the twinkling of the yellow LED. After the reset, the network connection will be restored, the interface will no longer indicate problems and the yellow LED will be constantly illuminated. Now, make appropriate adjustments of the Wi-Fi interface s configuration. Return to the Digi Device Discovery program and double-click the line of the chosen interface. The window of the default web browser will open. Log in correctly to obtain access to the configuration of the Wi-Fi interface. Fig. 9. The login window of the Wi-Fi interface. Type: Username: root Password: dbps Approve your entries with the Login button. In no time, the window that enables adjustments will be loaded. 9

Fig. 10. The panel of the interface s configuration. On the left from the window, there is a menu. Choose the Network option from the Configuration group. Another window will be loaded. Choose WiFi LAN settings at the bottom. The following window will appear: Fig. 11. The Wi-Fi LAN Settings window. Now, type the SSID network identifier, the same one that has been typed in the router s configuration. Type: PowerSecurity in the Network name field. The remaining settings should be made according to the picture above and approved by clicking 'Apply. The Apply button cannot be omitted! 10

From the same window, choose the WiFi Security Settings tab at the bottom. Settings from this tab are responsible for protection against attempts of unauthorized connection by other users. In the tabs: Network Authentication and Data Encryption choose these methods of authentication and data encryption that are supported by the router in use. Our router operates on the WPA-PSK key and the TKIP encryption therefore this is what we select. Open system is also worth selecting in both cases. Fig. 12. Window of the WiFi Security Settings. Next, in the WPA PSK section, in the field: Passphrase and Confirm enter any password that will later serve as the connection key. Type password, e.g.: Passphrase: blackpower Confirm: blackpower 11

Such implemented changes shall be approved by clicking the Apply button. After that, the message informing about approved changes will appear. Now the interface has been reprogrammed. However, to make it operate accordingly to the adjustments, it needs to be reset, but only after adjusting the router. To do that, change the panel in the browser into the router s configuration (the router may demand logging into the page again) and choose the Wireless menu and the proper Wireless Security tab. The adjustments should be made according to the picture below and they must be identical to the ones of the interface. Fig. 13. The window of the Wireless Security router. Approve the changes by clicking the Save Settings button and then by clicking Continue. Only now can the Wi-Fi interface be reset. It can be done by pressing the Reset button on the module or by cutting off the power for a few seconds. After the reset, the connection between the interface and the router should be re-established (the yellow LED is constantly illuminated). 12

4.6 STEP 4 Selecting the communication mode. Communication with the RS485-WiFi interface is possible in various modes. The selection is made by choosing the appropriate profile in the web browser of the interface and configuring appropriate parameters. The profile selection must be made on the basis of LAN connection between interfaces and power supply units taking part in the communication. 4.6.1 Communication in WLAN/WAN network. - Communication in WLAN network: Shown below is a block diagram of communication in WLAN. Fig.14. A block diagram of WLAN communication system. The topology of the network is based on wireless Wi-Fi router connected to another PSU segments (connected in the RS485 bus) via the RS485-WiFi interface. Each interface has a static IP address. Communication between a PC and the final PSU is by giving the IP address of the interface, the address of the PSU in the RS485 network and the number of the port responsible for the communication. If the foregoing topology has been chosen, proceed to chapter 'TCP Sockets profile settings' to make the configuration of the interfaces. 13

- Communication in WAN network: Fig.15. A block diagram of WAN communication system. Communication between a PC and the final PSU is by the Internet with the public IP address of the router connected to the interface. Data from the router are redirected to the RS485-WiFi interface, connected to the RS485 bus, and then forwarded to the PSU on the basis of the bus address. In this manner, one can establish communication with power supply units located in different power systems. If we select communication via WAN, an additional configuration of the router is required. Set the Port forwarding function by following the device s manual and acting accordingly to the producer s guidelines. To configure the function of redirecting the connection, give the IP address of the RS485-WiFi interface and the number of the port responsible for the communication. After correct configuration of the router, configure the interfaces by proceeding to 'TCP Sockets profile settings' chapter. 14

TCP Sockets profile settings. After logging in the interface configuration page, select the Serial Ports option from the Configuration group. Then, select TCP Sockets from the Select Port Profile window and approve your choice by clicking Apply. Caution! If the interface was configured before, the Serial Port Configuration window with current profile will appear instead of Select Port Profile. In such case, click Port 1 and then Change profile at the top of the next window. Only now, will the Select Port Profile window appear and the TCP Sockets profile can be chosen. Make setting adjustments in the TCP Server Settings subsection as shown below: Approve the settings by clicking Apply. Fig. 16. Settings of the TCP Sockets profile. If the port 2101 is already taken, choose another one, e.g. 2102. The selected port number is to be used consistently from now on. 15

Setting the parameters of the serial port. Select the Basic Serial Settings tab at the bottom of the page and adjust the settings as shown in the window below: Fig. 17. Setting the parameters of the serial port communication. Approve the settings by clicking Apply. Next, select the Advanced Serial Settings tab at the bottom and make adjustments in the TCP Setting section accordingly to the picture below. Approve the changes with the Apply button. Fig. 18. Configuration of communication parameters of the serial port. the TCP Settings tab. Reset the RS485-WiFi interface by pressing the RST button on the module or by cutting off the power for a few seconds. After the reset, the connection between the interface and the router should be re-established after approx. 30s. 16

Settings in the PowerSecurity program. For further configuration, the PowerSecurity program is required. Download it from the following page: http://www.pulsar.pl/pl/pliki/powersecurity.exe The program is saved as an executable file therefore does not require installation in the system. From the menu bar choose: Power supplies > New Power Supply. There will appear the window of Connection Setting which all settings are to be adjusted. Three parameters are particularly important: - the TCP address that indicates the interface located in a given segment of the network topology Caution! If the connection is via WAN, use the public IP address of the router. - the address in the Power Supply window indicating directly the PSU in the RS485 bus, connected to the segment addressed by the TCP - the TCP port, the number of port responsible for data transmission Take notice to the preview refreshing period. It is to be prolonged according to the number of power supply units in the system not to cause communication interference. Prolong the reply period for the same reason. Fig. 19. The window of connection configuration an example of settings. PSU Name Address Refreshing Period of View [ms] CONNECTION Type Description The name that is to be assigned individually to each PSU. The address of the PSU in the RS485 bus. Caution! Addresses within same bus cannot be repeated. 100 60 000ms; Parameters refreshing time in the preview window. Modbus RTU TCP/IP TCP Address The address of the RS485-WiFi interface in WLAN. Caution. If the connection is via WAN, use the public IP address of the router. TCP Port 2101 The number of the TCP port. Response Timeout 100 60 000ms; [ms] Time of reply from the PSU. Delay Between Minimum break between subsequent transmissions. Polls [ms] Number of Number of retransmissions after which the program will report a connection failure. retransmission 17

After loading the connection configuration the window with a Preview tab will open. In the top left-hand corner there is an icon which is to be clicked to make a connection with the PSU. As the connection has been made, the window will display current parameters of the PSU. They will be automatically updated according to the previously set refreshing cycle. Fig. 20. The PSU preview window. To set the connection between the RS485-WiFi interface and any PSU connected to the RS485, check whether the communication parameters of the power supply unit s serial port are correct. The transmission parameters of the power supplies are preset to 19200 bauds 8E1. If the values were altered before, make the settings again accordingly to the information from the chapter: Setting the communication parameters of the PSU. 18

4.6.2 Communication in the WLAN serial bridge mode. Shown below is a block diagram of communication in the Serial Bridge serial bridge mode in WLAN. Fig.21. A block diagram of communication system in the serial bridge mode. The topology of the network is based on a wireless router which serves as a bridge between two segments of the RS485 bus. Each bus is connected to the RS485-WiFi interface, where one is the Client, and other the Server. Each interface has a static IP address. Communication between a PC and the final PSU is by entering the PSU address in the RS485 bus. Settings of the Serial Bridge profile Client/Server. To configure the interface, connect the switch/router to the computer, as shown in fig. 3. After logging in the interface configuration page, select the Serial Ports option from the Configuration group. Then, select Serial Bridge profile from the Select Port Profile window and approve your choice by clicking Apply. Configuration of the Client interface differs from the Server one therefore it is to be performed separately. Caution! If the interface was configured before, the Serial Port Configuration window with current profile will appear instead of Select Port Profile. In such case, click Port 1 in the displayed window and then Change profile at the top of the next window. Only now, will the Select Port Profile window appear and the Serial Bridge profile can be chosen. Configuration of the Client interface. Configuration of the Server interface. Fig. 22. Serial Bridge profile settings for the interfaces Client and Server. In the IP Address Fidel of the Client interface configuration, type the real IP address of the Server interface. Approve your settings with the Apply button. If the port 2101 is already taken, choose another one, e.g. 2102. The selected port number is to be used consistently from now on. 19

Setting the parameters of the serial port. The settings describes in this subsection are to be applied to both RS485-WiFi interfaces. Select the Basic Serial Settings tab at the bottom of the window and adjust the settings as shown in the window below: Fig. 23. Setting the parameters of the serial port communication. Approve the settings with the Apply button. Next, select the Advanced Serial Settings tab at the bottom of the window and adjust the settings in the TCP Settings section accordingly to the picture below. Approve the changes with the Apply button. Fig. 24. Configuration of communication parameters of the serial port TCP Settings tab. Reset the RS485-WiFi interface by pressing the RST button on the module or by cutting off the power for a few seconds. After the reset, the connection between the interface and the router should be re-established within approx. 30s. 20

Settings in the PowerSecurity program. For further configuration, the PowerSecurity program is required. Download it from the following page: http://www.pulsar.pl/pl/pliki/powersecurity.exe The program is saved as an executable file therefore does not require installation in the system. Run the PowerSecurity program and choose: Power supplies > New Power Supply from the menu bar. There will appear the window of Connection Settings in which all settings are to be adjusted. Take notice to the preview refreshing period. It is to be prolonged according to the number of power supply units in the system not to cause communication interference. Fig. 25. The window of connection configuration an example of settings. PSU Name Address Refreshing Period of View [ms] CONNECTION Type Port Baud Rate Parity Response Timeout [ms] Delay Between Pools [ms] Number of retransmission Description The name that is to be assigned individually to each PSU. The address of the PSU in the RS485 bus. Caution! Addresses within same bus cannot be repeated. 100 60 000ms; Parameters refreshing time in the preview window. Modbus RTU Enter the number of the COM port same as the one assigned in the Device Manager. 19 200 bauds even 100 60 000ms; Time of reply from the PSU. Minimum break between subsequent transmissions. Number of retransmissions after which the program will report a connection failure. After loading the connection configuration the window with a Preview tab will open. In the top left-hand corner there is an icon which is to be clicked to make a connection with the PSU. As the connection has been made, the window will display current parameters of the PSU. They will be automatically updated according to the previously set refreshing cycle. 21

Fig. 26. The PSU preview window. To set the connection between the RS485-WiFi interface and any PSU connected to the RS485, check whether the communication parameters of the power supply unit s serial port are correct. The transmission parameters of the power supplies are preset to 19200 bauds 8E1. If the values were altered before, make the settings again accordingly to the information from the chapter: Setting the communication parameters of the PSU. 22

5. Setting the communication parameters of the PSU. Communication in the RS485 bus requires setting appropriate communication parameters in all power supply units and assigning appropriate addresses. Configuration in PSBEN power supply units is via the display mount in the faceplate of the enclosure. The configuration procedure is different for an LED and LCD display. The address for all power supply units is preset to 1. 5.1 Configuration of the PSU with an LCD display. Setting the address of the PSU. - enter the PSU Settings menu (if the main screen is displayed, press the SET button) - with > or < choose the Power Supply menu - approve your choice with the SET button - with > or < choose the Comm. Address - press the SET button - the prompt will appear at the end of the line - with > or < set the address from 1 to 247 - approve your choice with the SET button 23

Setting the parameters of the serial port. To enter the settings mode, press the SET button from the main screen level. - with > or < set the PSU menu - press the SET button - with > or < set the Transmission menu (the Transmission menu is at the very bottom of the screen) - press the SET button, the prompt will appear at the end of the line - with > or < set 19.2k 8E1 - approve your choice with the SET button 24

5.2 Configuration of the PSU with an LED display. Setting the address of the PSU. - press the <,> right and left-most buttons simultaneously on the LED panel - when the abbr Adr appears, press OK. - with > or < set the address from 1 to 247 - approve the set address with the OK button Setting the parameters of the serial port. - press the <,> right and left-most buttons simultaneously on the LED panel - the abbr Adr will appear on the display - press the > right arrow button - the abbr trs will appear on the display - press OK - now, on the display there will appear either 9.6 or 19.2 values informing of the transmission s speed - with > or < set the transmission s speed to 19200, which is displayed as 19.2 - approve the setting with the OK button - the abbr trs will be displayed again - press the > right arrow button - press OK after appearing of trp on the display 25

- now, one of the following abbreviations will be displayed: 8n2, 8E1 or 8o1 - with > or < set the 8E1 parameter - approve your choice with the OK button - finish the configuration procedure by pressing simultaneously the <,> buttons 6. Specifications. Power supply Current consumption TTL transmission s speed Wi-Fi transmission s speed Indication (LEDs) Operating conditions Dimensions (LxWxH) Net/gross weight Protection grade Storage temperature 10 30V DC 130 50mA 19200 bit/s, with party control max 11Mbps Tx, Rx, PWR temperature -10 o C 40 o C relative humidity 20%...90% without condensation 121(+72 antenna) x 81 x 60 [mm] 0,28kg / 0,39kg IP65-20ºC...+60ºC 26

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WEEE MARKING According to the EU WEE Directive It is required not to dispose of electric or electronic waste as unsorted municipal waste and to collect such WEEE separately. WARRANTY 5 years from the date of production. THE WARRANTY IS VALID only upon presentation of the item s proof of purchase. Pulsar K.Bogusz Sp.j. Siedlec 150, 32-744 Łapczyca, Poland Tel. (+48) 14-610-19-40, Fax. (+48) 14-610-19-50 e-mail: biuro@pulsar.pl, sales@pulsar.pl http:// www.pulsar.pl, www.zasilacze.pl 28