INSTRUCTION MANUAL NL240 Wireless Network Link Interface Revision: 9/14 C o p y r i g h t © 2 0 1 1 - 2 0 1 4 C a m p b e l l S c i e n t i f i c , I n c .
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Table of Contents PDF viewers: These page numbers refer to the printed version of this document. Use the PDF reader bookmarks tab for links to specific sections. 1. Introduction ................................................................. 1 2. Cautionary Statements ............................................... 1 3. Quickstart .................................................................... 1 3.1 3.2 3.3 3.4 Physical Setup .........................................................................
Table of Contents 8.2.2.5 Connect ............................................................................ 22 8.2.3 TCP Serial Server....................................................................... 22 8.2.3.1 Physical Setup ................................................................. 22 8.2.3.2 Configuring the NL240 ................................................... 22 8.2.3.3 LoggerNet Setup .............................................................. 23 8.2.3.4 Connect .................
Table of Contents Figures 3-1. 3-2. 4-1. 4-2. 4-3. 5-1. 6-1. 6-2. 8-1. 8-2. 8-3. 8-4. 9-1. NL240 with CR800 (powered through CS I/O port) ............................ 2 LoggerNet setup ................................................................................... 4 NL240 .................................................................................................. 5 Bridge Mode enabled ........................................................................... 5 Bridge Mode disabled .............
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NL240 Wireless Network Link Interface 1. Introduction The NL240 is a WLAN (Wireless Local Area Network) interface that allows Campbell Scientific dataloggers and peripherals to communicate with a Wi-Fi network or wireless ad hoc network. This WLAN interface can be connected to a datalogger’s CS I/O port or RS-232 port. 2. 3.
NL240 Wireless Network Link Interface 3.1 Physical Setup Attach an antenna to the NL240’s antenna connector. Using the supplied serial cable, connect the NL240’s CS I/O port to the datalogger’s CS I/O port. Alternatively, power the NL240 through the barrel-connector jack located on the edge of the device. Ensure that the device is powered up by inspecting the Power LED. FIGURE 3-1. NL240 with CR800 (powered through CS I/O port) 3.
NL240 Wireless Network Link Interface NOTE • Ensure the NL240 is powered. • Connect the supplied USB cable between a USB port on your computer and the USB port on the NL240. • Open DevConfig. • Under Device Type, select Network Peripheral | NL240. • Click the Browse button next to Communication Port. • Select the virtual com port labeled NL240. • Click OK. • Click Connect. • Click on the Wi-Fi tab.
NL240 Wireless Network Link Interface 3.3 LoggerNet Setup The next step is to run LoggerNet and configure it to connect to the datalogger via the NL240. • In the LoggerNet Setup screen, press Add Root and choose IPPort. Input the NL240 IP address and port number. The IP address and port number are input on the same line separated by a colon. IPv6 addresses will need to be enclosed in square brackets when specifying a port number. An IPv4 address may look like 192.168.1.100:6785.
NL240 Wireless Network Link Interface 4. Overview The NL240 Wireless Network Link Interface is designed for communication with Campbell Scientific dataloggers and peripherals over a Wi-Fi network. The Wi-Fi network can be an infrastructure network or an ad hoc (point-topoint) network. See Section 6, Wi-Fi, for more information. The NL240 includes a CS I/O port and an RS-232 port for communication. A USB device port is used for configuring the NL240 device. FIGURE 4-1.
NL240 Wireless Network Link Interface (R2-232 and CS I/O) is only associated with one service (PakBus router, serial server, Modbus/TCP Gateway, etc.) at a time. For example, you can have an RS-232 serial server and a CS I/O serial server, an RS-232 serial server and a CS I/O PakBus router, an RS-232 PakBus router and a CS I/O serial server, or an RS-232 PakBus router and a CS I/O PakBus router. In addition, the NL240 can act as TLS proxy server. The TLS proxy server is independent of other modes.
NL240 Wireless Network Link Interface Campbell Scientific’s LoggerNet software is used to communicate with the dataloggers once the NL240 is configured properly and connected to a network. Bridge Mode • Allows access to datalogger’s internal IP functionality when a peripheral port is not accessible. For example, accessing the HTTP/webpage, email, and FTP capabilities of a CR800/850, ET107, RAWS, or CS110.
NL240 Wireless Network Link Interface 5. Specifications General 177 g (6.3 oz) 16 x 6.73 x 2.54 cm (6.3 x 2.65 x 1 in) 2.65 [6.73] FIGURE 5-1. NL240 dimensions Power CS I/O or DC Barrel Connector (not USB) 7 to 20 Vdc NOTE 8 If you wish to prevent the NL240 from being powered over the CS I/O port, you can do so by removing a jumper. See Appendix B, Cables, Pinouts, LED Function, and Jumper, for more information.
NL240 Wireless Network Link Interface Power Consumption Maximum: 950 mW Typical, Low Power Disabled connected to Access Point: 600 mW idle, 670 mW communicating searching for out of range network: 65 mW Typical, Low Power Enabled connected to Access Point: 73 mW idle, 480 mW communicating searching for out of range network: 50 mW Sleep: 16 mW NOTE Standby power is when the IPNetPower instruction has been used to turn off power to the Wi-Fi.
NL240 Wireless Network Link Interface Compliance RoHS Compliant Complies with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. Contains an embedded radio transmitter with the following approvals: FCC Identifier: XF6-RS9110N1102 Industry Canada: 8407A-91101102 Europe ETSI EN 301 489-17 V1.2.1:2002 Europe ETSI EN 300 328 V1.7.1:2006 6. Wi-Fi 6.
NL240 Wireless Network Link Interface easiest wireless network to connect the NL240 to. (See Section 8.1, Wi-Fi Connection, for details.) The network password/key (if required) and SSID can be obtained from your network administrator. FIGURE 6-1. Infrastructure network Unlike infrastructure networks, ad hoc or peer-to-peer networks do not have a single device (like a WAP) that controls access to the wireless network (see FIGURE 6-2, Ad hoc network). Instead, network management and access is decentralized.
NL240 Wireless Network Link Interface RSSI in the NL240 is measured in a scale between –100 dBm and 0 dBm. The higher the number (i.e. –12 dBm as compared to –72 dBm), the better the connection between Wi-Fi devices. A reliable connection will be maintained if the RSSI reading in the NL240 stays between –85 dBm and –15 dBm. A weak, and thus intermittent, connection will have readings between –85 dBm and –95 dBm. For every 3 dBm increase, the NL240 is receiving twice as much signal (radiated power).
NL240 Wireless Network Link Interface After the NL240 has joined a network, the green LED will flash with network activity. If the NL240 is configured for DHCP, the green LED will blink once a second while it is attempting to acquire a network address from DHCP. Operating System Upgrade When a new operating system is sent to the NL240, the red LED will blink repeatedly while the NL240 copies the operating system into its internal flash. This process takes about 10 seconds.
NL240 Wireless Network Link Interface 7.2 Configuring the NL240 with DevConfig via Wi-Fi WLAN NOTE 7.3 • Apply power to the NL240. • The NL240 will power up and join the strongest, open Wi-Fi network it finds or the Wi-Fi network it has already been configured to join. The green LED on the NL240 will come on and start blinking once it has joined the network. Once it has successfully obtained an IP address, it will stop blinking and flicker with network activity. • Launch DevConfig.
NL240 Wireless Network Link Interface 7.4 Type edit and press Enter to edit the settings of the NL240. • As each NL240 setting is shown, press Enter to accept the current value shown in parenthesis. Type a new value and press Enter to change the value. • After progressing through all of the NL240 settings, type save to accept the changes or cancel to discard the changes. • Type bye to exit Telnet. Configuring the NL240 via RS-232 NOTE 8.
NL240 Wireless Network Link Interface 8.1 Wi-Fi Connection 8.1.1 Join an Existing Network In this configuration, the device will scan for available networks and attempt to join the network (infrastructure or ad hoc) specified by the SSID setting. NOTE • Connect to the NL240 in DevConfig (see Section 7, Configuring the NL240). • Click on the Wi-Fi tab. • Set Configuration to Join an Existing Network.
NL240 Wireless Network Link Interface 8.2 • If you have chosen WEP Security, enter the WEP key to be used for the network in the Password field. (See Appendix C for details on the WEP key requirements.) • Select the Channel to be used for the network. (The Suggest Channel button can be used to have the NL240 scan the networks for the channel that is least likely to encounter interference from other networks.) • Select the TX Power Level, Low Power Mode, Low Power Interval, and Low Power On Time.
NL240 Wireless Network Link Interface barrel-connector jack located on the edge of the device. Connect the NL240 to your local wireless network by attaching an antenna to the NL240 antenna connector. Ensure that the device is powered up by inspecting the Power LED. 8.2.1.2 Configuring the NL240 RS-232 PakBus® Router • Connect to the NL240 in DevConfig (see Section 7, Configuring the NL240). • On the NL240 tab: o • • Set Bridge Mode to disable. On the RS-232 tab: o Set Configuration to PakBus.
NL240 Wireless Network Link Interface • On the Network Services tab: o Make note of the PakBus\TCP Server Port. (The default PakBus/TCP Server Port is 6785. Unless firewall issues exist, it is not necessary to change the port from its default value.) 8.2.1.3 LoggerNet Setup • In the LoggerNet Setup screen, press Add Root and choose IPPort. Input the NL240’s IP address and port number. The IP address and port number are input on the same line separated by a colon. • Add a PakBus® Port (PakBusPort).
NL240 Wireless Network Link Interface 8.2.1.4 Connect You are now ready to connect to your datalogger using the LoggerNet Connect screen. 8.2.2 Bridge Mode With Bridge Mode Enabled, the device will act as a bridge from WLAN to CS I/O. All IP packets that come into the device via WLAN will be communicated as a complete Ethernet/TCP packet to the datalogger over the CS I/O port.
NL240 Wireless Network Link Interface NOTES The NL240 must be connected to the datalogger before configuring the datalogger with DevConfig. If it is not connected, the TCP/IP settings will not be displayed. By default, the NL240 uses the datalogger’s CS I/O Interface #2. If connecting more than one NL240 to a datalogger, one NL240 can be configured to use CS I/O Interface #1.
NL240 Wireless Network Link Interface FIGURE 8-2. Bridge mode LoggerNet setup 8.2.2.5 Connect You are now ready to connect to your datalogger using the LoggerNet Connect screen. 8.2.3 TCP Serial Server The NL240 can tunnel RS-232 and CS I/O serial communications over Wi-Fi. Any packet sent to the configured IP port will have the IP layer removed, and the data is then directed to the serial connection. 8.2.3.
NL240 Wireless Network Link Interface • On the NL240 tab: o • Set Bridge Mode to disable. On the RS-232 tab: o Set Configuration to TCP Serial Server. o Set Baud Rate to baud rate of attached device. o Make note of the Service Port. (The default RS-232 Service Port is 6784. Typically, it is not necessary to change this entry from its default.) CS I/O Serial Server • Connect to the NL240 in DevConfig (see Section 7, Configuring the NL240). • On the NL240 tab: o • Set Bridge Mode to disable.
NL240 Wireless Network Link Interface FIGURE 8-3. CS I/O Serial Server LoggerNet Setup 8.2.3.4 Connect You are now ready to connect to your datalogger using the LoggerNet Connect screen. 8.2.3.5 Serial Sensors The NL240 configured as an RS-232 serial server as described above can be used to communicate with a serial sensor. However, LoggerNet is not capable of communicating with the serial sensor. You must have some other method of communicating with the sensor. 8.2.
NL240 Wireless Network Link Interface 8.2.5 Modbus TCP/IP to RTU Gateway The NL240 can serve as a Modbus TCP/IP to RTU Gateway. It will listen for incoming Modbus TCP/IP connections from a Modbus TCP/IP master client. The port number of the listening connection is specified in the RS-232 Service Port Number setting and is typically set to a value of 502. The NL240 will convert incoming Modbus TCP/IP frames to Modbus RTU and forward them to the RS-232 port.
NL240 Wireless Network Link Interface • Enter the TLS Private Key Password if the TLS Private Key is encrypted. Otherwise, leave the setting blank. • After loading the key and certificate, click the Apply button. The NL240 will reboot. Connect with DevConfig again and navigate to the Settings Editor tab and then to the TLS tab. The TLS Status should say Initialized. NOTE The TLS Settings described above cannot be edited over a standard TCP DevConfig link.
NL240 Wireless Network Link Interface FIGURE 8-4. TLS proxy server configurations Configuration A In Configuration A, the NL240 decrypts TLS traffic and forwards the unencrypted TCP traffic to the datalogger over the CS I/O port. The NL240 is able to “learn” the IP address of the attached datalogger and will open a TCP connection on the “learned” IP address.
NL240 Wireless Network Link Interface • For Configuration A, leave the TLS Proxy Forward IP Address set to 0.0.0.0. For Configuration B, enter the datalogger’s IP address in the TLS Proxy Forward IP Address setting. This address must be configured in the datalogger. It must be a unique, static IP address on the same subnet as the NL240 IP address. For example, if the NL240 IP address is 192.168.5.1 with subnet 255.255.255.0, a valid IP address for the datalogger would be 192.168.5.
NL240 Wireless Network Link Interface NOTES If the status of the TLS stack is Initialized, the NL240 will automatically negotiate a secure TLS connection with DevConfig as long as the Use IP Connection option is selected. Encrypted Communication is required to change the TLS Private Key and/or TLS Certificate via TCP. The private key and certificate cannot be initialized via TCP, since the connection is not encrypted. They must be initialized through a direct USB connection to the NL240.
NL240 Wireless Network Link Interface o • Input the IP Address, Network Mask, and Default Gateway. These values can be provided by your network administrator. On the Network Services tab: o Make note of the PakBus/TCP Server Port. 9.1.2 Configuring the Datalogger NOTE The datalogger must first be configured for internet communication (i.e., through an NL115, an NL120, a second NL240, or a cellular modem). • Connect a serial cable from the PC COM port to the datalogger’s RS-232 port.
NL240 Wireless Network Link Interface 3. Power cycle the NL240 and your WAP/hub/router/PC. • 4. Turn off or unplug your WAP/hub/router/PC and NL240. Wait 10 seconds and then plug them back in or turn them on. A full restart may take 30 to 60 seconds. Check the settings of the NL240. • Make sure you have entered the correct SSID and Key/Passphrase (if needed) for your network.
NL240 Wireless Network Link Interface the IP address of the NL240 in LoggerNet Setup in order for LoggerNet to communicate through the NL240. For example, if the NL240 is configured as a CS I/O serial server, in LoggerNet Setup, enter the correct IP address of your NL240 followed by :6783 (e.g., 192.168.0.3:6783). 6. If you are unable to communicate with the NL240 via the USB cable, verify that you have installed the latest drivers for the NL240. These can be downloaded from our website at www.campbellsci.
NL240 Wireless Network Link Interface • If running NL240 firmware revision v.4 or greater, you can also type “eventloga” at the prompt to obtain an ASCII version of the low-level log. Copy and paste the output into a text file. • Once the eventlogs have been copied, you can type “eventlog erase” at the prompt to clear the log. If you want to add a date to indicate when the logs were last cleared, you can enter “eventlog erase date” where date is a string of up to 8 characters.
NL240 Wireless Network Link Interface 34
Appendix A. Glossary Beacon Interval Devices in a PakBus® network may broadcast a hello-message to other devices in order to determine "neighbor" devices. Neighbor devices are devices that can be communicated with directly by the current device without being routed through an intermediate device. A beacon in a PakBus network helps to ensure that all devices in the network are aware of which other devices are viable in the network.
Appendix A. Glossary Port Number A port number is a way to identify a specific process to which a network message is to be forwarded when it arrives at the NL240. SDC (Synchronous Device Communications) A Campbell Scientific, addressable, and synchronous communications protocol. The protocol allows multiple peripherals to be connected to the same device as long as each peripheral has a unique SDC address.
Appendix B. Cables, Pinouts, LED Function, and Jumper B.1 CS I/O The CS I/O cable is a 9-pin, straight-through cable with all 9 pins connected. The supplied SC12 cable (pn 16675) is recommended. TABLE B-1. CS I/O Pinout Pin Datalogger (DB9 Female) Function Peripheral (DB9 Male) Function 1 5 VDC N/C 2 SIGNAL GND SIGNAL GND 3 RING RING 4 RXD TXD 5 ME ME 6 SDE SDE 7 CLK/HS CLK/HS 8 12 VDC N/C 9 TXD RXD B.
Appendix B. Cables, Pinouts, LED Function, and Jumper B.3 USB The USB cable is the supplied USB A to micro B style cable (Campbell Scientific part number 27555). This is used only for device configuration. TABLE B-3. USB Micro-B Pin Function 1 VBUS (Not Used) 2 Data - 3 Data + 4 N/C 5 GND B.4 Power TABLE B-4. Power In Pin Function Center 7 – 20 Vdc Sleeve Power GND B.5 LEDs TABLE B-5. Power LED (Red) State Description Off Device powered off.
Appendix B. Cables, Pinouts, LED Function, and Jumper TABLE B-6. Wi-Fi LED (Green) State Description Blinking once a second Attempting to acquire a network address from DHCP. Flash with network activity Successfully connected to wireless network. B.6 Power Jumper If you wish to prevent the NL240 from being powered over the CS I/O port, remove the two screws on the top of the NL240, remove the NL240’s top cover, remove the jumper above the red LED and place it so that it is connected to only one post.
Appendix B.
Appendix C. NL240 Settings All of the NL240 settings available from the Settings Editor in DevConfig are described below. C.1 Main Tab Model (read only) Model name. Serial Number (read only) Specifies the NL240 serial number assigned by the factory. OS Version (read only) Operating system version currently in the NL240. Compile Date (read only) Operating system compile date. Bridge Mode This setting is used to configure the device's mode of operation.
Appendix C. NL240 Settings CS I/O IP Interface Identifier When the device is configured to operate in Bridge Mode, the datalogger will address the device using this identifier. The datalogger can address up to two “CS I/O IP” devices. The corresponding CS I/O IP Address settings in the datalogger will control the interface. CS I/O IP Interface 1 uses SDC channel 3. CS I/O IP Interface 2 uses SDC channel 1.
Appendix C. NL240 Settings IP Address The IP address uniquely identifies this node on an internet. If DHCP is enabled, this is the IP address obtained from the DHCP server. If DHCP is disabled, a static IP address must be obtained from your network administrator for use with this device. (It is recommended to configure a static IP address.) NOTE In bridge mode, this setting is obtained from the datalogger and cannot be edited here. It must be edited in the datalogger settings.
Appendix C. NL240 Settings Admin Password To help guard against unauthorized access to the NL240, it is passwordprotected by the Admin Password. This password will be required to gain access to the NL240 via DevConfig over TCP and telnet. If the password setting is left blank, no password is required to access the NL240. After settings are saved, the new password will be in effect. TCP Configuration Port Number The default TCP port number for configuration via TCP is 6786.
Appendix C. NL240 Settings Ad hoc Channel must also be specified. Choose a channel that is different from any surrounding wireless networks to minimize interference. SSID (Service Set Identifier) The SSID is the name that identifies a wireless network (32 character maximum). The SSID differentiates one wireless network from another, so all devices attempting to connect to the same network must use the same SSID.
Appendix C. NL240 Settings NOTE This setting affects the transmission power level of the NL240, which may affect the transmission range of the device. This setting does not affect the overall power consumption of the device. Lower Power Mode If Low Power Mode is enabled, then the device will be put into its power saving mode. At full power the device consumes approximately 0.6W when idle and 0.7W when communicating (USB disconnected). Enabling Low Power will result in significant power savings.
Appendix C. NL240 Settings Low Power Interval.” It will create the Ad hoc network and it will stay on for the amount of time configured in the “Ad hoc Low Power On Time” setting. Then it will power of the Wi-Fi for the remainder of the interval. This means that if you wish to join the Ad hoc network with a smartphone or some other device, you will notice that the network may not be available until you wait for the programmed interval to elapse. Once you see the network become available, join it.
Appendix C. NL240 Settings Wireless Networks in Area This is a read-only field that lists the networks available in the area. Information listed for each network is: SSID, RSSI / Signal Strength, Channel, Security. NOTE If the NL240 is creating an ad hoc network, wireless networks in the area may not be displayed. C.3 RS-232 Tab RS-232 Configuration This setting controls which process will be associated with the RS-232 port.
Appendix C. NL240 Settings RS-232 Service Port Number This setting is used when the RS-232 port is configured as a Serial Server or MODBUS/TCP gateway. To communicate with a TCP/IP server, the client application must open a socket to that server. The socket of a specific server is uniquely identified by an IP address of the host where the server is running and a port number associated with the server application on that host. This entry is where the port number of the server is set.
Appendix C. NL240 Settings unacceptable, set this setting to “Always On” to keep the RS-232 port always on. Power Down Port when Inactive The device will power down RS-232 when the port is inactive. If the device is configured for Serial Server mode, the inactivity timeout is 40 seconds. If configured for PakBus, the device can use the PakBus protocol’s link-state to do a more intelligent and effective inactivity timeout.
Appendix C. NL240 Settings RS-232 Modbus Timeout This setting determines how long the MODBUS/TCP to MODBUS/RTU gateway will wait for an answer from the MODBUS slave device(s) attached to the RS-232 port. If no answer is received within the timeout period, the MODBUS/TCP server will reply to the MODBUS/TCP client with error code 0x0B (Target Device Failed to Respond).
Appendix C. NL240 Settings number of the serial server is set. Typically, it is not necessary to change this entry from its default. (range 1..65535) SDC Address Communication with the datalogger via the CS I/O port is done using SDC (Synchronous Device Comms). The datalogger will address the devices with which it wishes to communicate using an SDC address. The CS I/O port can be configured to respond to SDC address 7, 8, 10, or 11.
Appendix C. NL240 Settings Telnet Timeout This setting, in units of seconds, will determine how fast the configuration monitor telnet session will time out if no activity is detected. Set to 0 for no time-out (not recommended). (range 0..999) Ping (ICMP) The NL240 will not respond to “Ping” requests if this setting is disabled. PakBus Address This setting specifies the PakBus® address for this device.
Appendix C. NL240 Settings Port Number Specifies a numeric code for the port that the router will use. It will correspond with one of the following: 0 CS I/O 1 RS-232 100 PakBus/TCP Connection — If the value of the port number is 100 or greater, the connection is made through PakBus/TCP. Via Neighbor Address Specifies the address of the neighbor/router that will be used to send messages for this route. If the route is for a neighbor, this value will be the same as the address.
Appendix C. NL240 Settings TLS Proxy Server Port Number When doing TLS Proxy communications, the NL240 TLS server maintains a secure connection with a remote client. If the TLS Proxy Forward Physical Port is specified to be the CS I/O port, the NL240 will then open a TCP connection with the logger over the CS I/O port and do unecrypted data transfer with the datalogger.
Appendix C. NL240 Settings of the datalogger’s TCP server is uniquely identified by an IP address and a port number. This entry is where the port number of the NL240’s TCP client is set. The datalogger’s TCP server port must be set to communicate on this port number. If secure communications come in on the TLS Proxy Server Port Number, the NL240 will attempt to open a TCP connection to the datalogger on the TLS Proxy Forward Port Number.
Appendix C. NL240 Settings TLS Certificate Specifies the public certificate (in PEM format) for the encryption stack. NOTE This setting can only be edited/transmitted if the DevConfig link is considered secure (USB or TLS). If the TLS stack has been initialized, the device will automatically negotiate a secure TLS connection with DevConfig if the Use TCP option is selected.
Appendix C.
Appendix D. Sending a New OS to the NL240 Whenever a new operating system is released for the NL240, it will be available from our website, www.campbellsci.com/downloads. D.1 Sending an OS via USB Follow these steps to send the new OS to the NL240 via USB: 1. Plug the wall charger into an AC outlet and the barrel connector into the NL240’s power jack. 2. Connect a USB cable between one of your computer’s USB ports and the USB port on the NL240. 3. Open DevConfig. 4.
Appendix D. Sending a New OS to the NL240 3. Open DevConfig. 4. Select the NL240 under Device Type. 5. Ensure that the Use IP Connection box is checked on the left hand panel. 6. If the Admin Password of the device has been set, you will need to enter that password in the TCP Password control on the left panel in order for the connection to succeed. 7. Enter the IP address or domain name address of the device in the Communication Port control on the left panel.
Appendix E. Radio Frequency Emission Changes or modifications to the NL240 not expressly approved by Campbell Scientific, Inc. could void the user’s authority to operate this product. NOTE This equipment has been tested and found to comply with the limits for a Class B digital device, pursuant to part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation.
Appendix E.
Campbell Scientific Companies Campbell Scientific, Inc. (CSI) 815 West 1800 North Logan, Utah 84321 UNITED STATES www.campbellsci.com • info@campbellsci.com Campbell Scientific Centro Caribe S.A. (CSCC) 300 N Cementerio, Edificio Breller Santo Domingo, Heredia 40305 COSTA RICA www.campbellsci.cc • info@campbellsci.cc Campbell Scientific Africa Pty. Ltd. (CSAf) PO Box 2450 Somerset West 7129 SOUTH AFRICA www.csafrica.co.za • cleroux@csafrica.co.za Campbell Scientific Ltd.
