This product is no longer available and has been replaced by: NL241. Some accessories, replacement parts, or services may still be available.
NL240 Wireless Network Link Interface
Services Available


The NL240 is a wireless networking peripheral that provides Wi-Fi connectivity to our dataloggers and peripheral devices over standard 802.11b/g/n networks. It is a low-power device that offers unique and powerful PakBus networking capabilities, but it is easy to configure. The NL240 provides direct access to all the IP capabilities of the CR800, CR1000, and CR3000 dataloggers.

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Benefits and Features

  • Low power consumption
  • Wi-Fi-to-CS I/O bridging provides direct access to Internet protocol capabilities of CR6, CR800, CR850, CR1000, or CR3000 dataloggers
  • Powerful PakBus routing capabilities
  • Serial server functionality for networking Campbell Scientific devices, as well as third-party devices
  • Provides IP connectivity for communication with LoggerLink smartphone app and LoggerNet PC software


Technical Description

Ordering Information

Network Link Interface NL240 Wi-Fi Communications Peripheral - shipped with an SC12 cable for connecting to the datalogger’s CS I/O port, and hardware for mounting to an enclosure backplate

Power Peripherals

One of the following is required to power the NL240 if the device is not connected to the datalogger’s CS I/O port. 004248 AC/DC adapter that can power the NL240 independently from an AC power outlet. 006725 Field power cable allows the NL240 to be powered from a 12 Vdc source.

Antennas and Antenna Cables

An antenna is required to use the NL240 009961 Unity gain (0 dBd), 1/2 wave whip, omnidirectional antenna, which features an articulating knuckle joint that can be oriented vertically or at right angles. 009962 Waterproof enclosure mount antenna. Serial Cable #10873 DB9 Female to DB9 Male Cable (1.82 m) – connects the NL240 to the datalogger’s RS-232 port.


Compliance CE compliant
Material Aluminum case with black anodized finish
  • Device Configuration Utility over USB or Wi-Fi
  • Terminal menu over Telnet
  • Terminal menu over RS-232
CS I/O Port SDC 7, 8, 10, or 11 (does not support ME)
RS-232 Port DTE, DB9 Pin (Male)
USB Port Micro-B
Operating Temperature Range
  • -25° to +50°C (standard)
  • -55° to +85°C (extended)
Power Connector CS I/O Port, DC barrel connector (not powered over USB)
Powered Over CS I/O or barrel plug
Supply Voltage 7 to 20 Vdc
Connections/Routes Supported
  • Supports 50 simultaneous TCP connections.
  • Up to 10 of the 50 TCP connections can be used for TLS.
  • PakBus Router supports 50 routes.
  • 15 Modbus Server Transactions (maximum)
Dimensions 16 x 6.73 x 2.54 cm (6.3 x 2.65 x 1 in.)
Weight 177 g (6.3 oz)

Communication Rate

RS-232 Port 1200 bps to 115.2 kbps
CS I/O Port 9600 bps to 460.8 kbps


Antenna Connector RPSMA
Technologies Supported 802.11b/g/n, WPA, WPA2 /TKIP or AES, WEP, WEP(open), APIPA/AutoIP, IPv4, IPv6, ICMP/Ping, ICMPv6/Ping, TCP, DHCP Client, SLAAC, DNS Client, HTTPS Proxy, Telnet Server, TLS, PakBus, Modbus, TCP/IP
Topologies Infrastructure and ad-hoc
Transmit Power 7 to 17 dBm (5 to 50 mW)
Rx Sensitivity -97 dBm (< 8% PER)
Frequency 2.4 to 2.5 GHz (2.4 GHz ISM band)

Power Consumption

Maximum 950 mW
Typical (Always On)
  • 600 mW (idle)
  • 670 mW (communicating)
  • 65 mW (searching for out-of-range network)
Typical (Low Power Mode Enabled)
  • 73 mW (idle)
  • 480 mW (communicating)
  • 50 mW (searching for out-of-range network)
Sleep 16 mW


Wi-Fi ad hoc networking is provided for the purpose of networking between NL240 interfaces. Ad hoc networking is supported by iOS, allowing an iOS device to connect to an NL240 that has created a network. Wi-Fi ad hoc networking is not supported natively by Android OS and is difficult to support on Windows 7 and greater.


Our Device Configuration Utility must be version 2.03 or higher.

Data Logger Considerations

Data Logger Serial Server PakBus Router Bridge Mode*
CR200(X) Series
Data Loggers

♣The CR300 connects to the NL240 using a 10873 serial cable that is not supplied with the CR300 or the NL240. The CR300-series dataloggers are not compatible with the bridge mode functionality in the NL240 interface.
* The data logger OS must be OS 25 or higher for bridge mode applications.
** It is possible to use an NL240 to connect to a mixed-array data logger (e.g., CR10, CR10X, CR23X, 21X, CR7) by using an SC32B between the data logger's CS I/O port and the NL240's RS-232 port.


NL240 Firmware v.10.03 (671 KB) 04-09-2018

Current NL240 firmware. Requires the Device Configuration Utility and a USB micro cable. 

Note: When updating to OS 10.03 from OS 6 or previous, settings will be reinitialized to factory defaults. When updating to OS 10.03 from OS 7, settings will be retained.

View Revision History

FAQs for

Number of FAQs related to NL240: 14

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  1. No. Antennas are ordered separately, allowing customers to choose the best antenna for their application and site.

  2. Yes. We currently have, and continue to develop, a variety of products that are compatible with IPv6 networking. For example, the NL200/201 and NL240 can serve as IPv6 serial servers for our data loggers and communications peripherals. We anticipate IPv6 compatibility to be included in the CR800, CR850, CR1000, and CR3000 by mid-2014. 

  3. If the NL240 is on a different network from the server running LoggerNet, either the station or LoggerNet needs to be able to initiate a connection to the other:

    • The NL240/data logger needs an IP address that is accessible to the LoggerNet computer


    • LoggerNet needs an IP address that is accessible to the NL240/data logger.
  4. The NL201 and NL240 are available options.

  5. Connect one data logger to the RS-232 port (6784) and the other data logger to the CS I/O port (6783). To access a data logger on the RS-232 port, use the IP address To access a data logger on the CS I/O port, use For setup instructions and configuration assistance, refer to the NL240 instruction manual, use the LoggerNet Network Planner tool, or contact Campbell Scientific. 

  6. The NL201 and NL240 are powered via the DC barrel connector and/or the CS I/O port. Sometimes, users who are using the network link
    interface as a serial terminal server, PakBus router, or Modbus gateway want to connect their devices via the CS I/O port while
    providing power only through the DC barrel connector and a 12 V source (such as a data logger SW12V output). In this scenario, a jumper
    inside the NL201 or NL240 can be removed, preventing the interfaces from always being powered by the CS I/O connections. For more
    information, refer to the instruction manual for the interface.

  7. It depends on the application, funds available for new hardware, and the quantity of data that will be collected. Viable options include the NL240, RF4xx spread-spectrum-series radios, RF32x UHF/VHF radios, and cellular modems.

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