This product is no longer available and has been replaced by: NL121. Some accessories, replacement parts, or services may still be available.
NL120 Ethernet Interface
Adds Connectivity
Connects dataloggers to LAN or Internet via Ethernet
weather applications water applications energy applications gas flux & turbulence applications infrastructure applications soil applications


The NL120 allows the datalogger to communicate over a local network or a dedicated Internet connection via TCP/IP. This small, rugged communication device connects directly to the 40-pin peripheral port on a CR1000 or CR3000 datalogger.

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Benefits and Features

  • Compatible with CR1000 and CR3000
  • Connects a datalogger to a network
  • Smallest Ethernet module available for the CR1000 and CR3000


Detailed Description

The NL120 uses a straight through cable when the cable is run from a hub to the NL120. A 10baseT Ethernet crossover cable is used if the cable is run directly from the computer to the NL120. For cable lengths longer than 9 feet, either a shielded 10baseT Ethernet cable or the 28033 surge protector needs to be used.

The NL120 is set up using the Device Configuration utility (DevConfig). DevConfig is bundled with our PC400, RTDAQ, and LoggerNet software and is available, at no charge, from:


Power Requirements 12 V (supplied through the datalogger’s peripheral port)
Ethernet Speed 10Base-T (10 Mbps), half-duplex
Typical Current Drain 20 mA
Dimensions 10.2 x 6.4 x 2.8 cm (4.0 x 2.5 x 1.1 in.)
Weight 66.62 g (2.35 oz)

EMI and ESD Protection

European Standards Meets requirements for a class A device under European Standards.
Application of Council Directive(s) 89/336/EEC as amended by 89/336/EEC and 93/68/EEC
Standards to Which Conformity Is Declared EN55022-1; 1995 and EN50082-1: 1992

Software Requirements

LoggerNet Version 3.2 or later
PC400 Version 1.3 or later
DevConfig Version 1.5 or later


Ethernet Cable

A 10baseT Ethernet straight through cable is used when the cable is run from a hub to the NL120. A 10baseT Ethernet crossover cable is used if the cable is run directly from the computer to the NL120. For cable length longer than 9 ft, the 10baseT Ethernet cable must be shielded or the 28033 surge suppressor must be used.

Datalogger Considerations

The NL120 fastens onto the datalogger's 40-pin peripheral port. This means that the NL120 is only compatible with the CR1000 and CR3000. It is NOT compatible with the CR800, CR850, CR200X, CR5000, or CR9000X dataloggers.

Compatible Dataloggers

CR200(X) Series CR800/CR850 CR1000 CR3000 CR5000 CR7X CR9000X

Compatible Enclosures

Attached to CR1000

ENC10/12 ENC10/12R ENC12/14 ENC14/16 ENC16/18

Attached to CR3000

ENC10/12 ENC10/12R ENC12/14 ENC14/16 ENC16/18


Frequently Asked Questions

Number of FAQs related to NL120: 23

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  1. The NL120 is a communications peripheral only. It does not provide additional analog terminals for a datalogger.

  2. Yes. The NL120 operates as transparent.

  3. Yes, the NL120 can be repaired. Refer to the Repair and Calibration page for the process of returning equipment to Campbell Scientific.

  4. The PakBus protocol allows multiple simultaneous connections. The PakBus address that LoggerNet uses for itself on one of the PCs needs to be changed, though.

  5. The following are some possible causes:

    • The datalogger’s OS needs to be updated.
    • A fault exists in the communications link away from the datalogger.
    • The NL120 is not fully plugged in.
    • There are loose or broken cables.
    • For a radio link, the aerial connections and alignment may need adjusting.
    • The NL120 or another device has suffered lightning damage.
  6. Yes. By configuring the NL120 as a CSDC device, both the NL120 and COM320 can share the same CS I/O port. The CR1000 and CR3000 are capable of multi-threading, so the NL120 and COM320 can run in parallel. For more information, refer to the NL120 Ethernet Module Instruction Manual.

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