This product is no longer available and has been replaced by: NL201.
NL200 Network Link Interface
Services Available
Repair Yes
Calibration No
Free Support Yes


Campbell Scientific's NL200 is a powerful network link interface that provides a wired Ethernet network connection to data loggers and peripherals. It allows our data loggers, as well as other serial devices, to communicate over a local area network or a dedicated Internet connection. Additionally, the NL200 supports sophisticated networking capabilities, especially when used in PakBus networks with PakBus devices. For example, with the NL200, multiple PakBus clients can be connected to a single data logger at the same time.

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Detailed Description

The NL200 communicates with Campbell Scientific data loggers and peripherals using an Ethernet 10/100 Mbps communications link. It has CS I/O and RS-232 ports for communication and a USB port for NL200 configuration.

The NL200 can be configured to bridge Ethernet and CS I/O communications allowing access to the internal IP functionality of the CR800, CR850, CR1000, and CR3000 (e.g., web page access, email, FTP). This device also can be configured to act as a serial server, as a PakBus router, or as a TLS Proxy server.


Power Connector DC Barrel
Power Requirements 7 to 20 Vdc (not powered via CS I/O or USB)
Operating Temperature Range -25° to +50°C
  • Device Configuration Utility over USB or Ethernet
  • Telnet console over Ethernet
CS I/O Port SDC 7, 8, 10, or 11 (does not support ME)
RS-232 Port DTE
USB Port Micro-B
Ethernet Port IEEE 802.3, Auto-MDIX, IPv4, TCP, DHCP, Ping, Telnet, TLS, PakBus
  • RoHS
  • Magnetic Isolation, ESD and Surge tested
  • Meets requirements for a Class B device under European standards.
Application of Council Directive(s) 2004/108/EC
Standards to Which Conformity Is Declared EN61326-1;2006
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.
Dimensions 16 x 6.73 x 2.54 cm (6.3 x 2.65 x 1 in.)
Weight 177 g (6.3 oz)

Current Drain

Active 50 mA (@ 13 Vdc)
Forced Standby 2 mA (available when using Ethernet-to-CS I/O Bridge Mode)

Communication Rate

RS-232 DTE Port 1200 to 115.2k bps
CS I/O Port 9600 to 460.8k bps
Ethernet 10/100 Mbps


Data Logger Considerations

Data Logger Serial Server PakBus Router Bridge Mode
CR200(X) Series
CR9000X *

data loggers


* Although compatible, the CR9000X does not need an Ethernet interface because it has an on-board Ethernet port.
** It is possible to use an NL200 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 NL200's RS-232 port.


NL200 / NL201 Drivers () 01-01-2014

Windows USB drivers for the NL200 Series are installed via the Device Configuration Utililty. In the Device Configuration Utility, click on the link "install the device driver" in the main body of text for the NL200 Series.

Note: Drivers must be installed before connecting the NL200 / NL201 to your computer.


NL200 / NL201 Firmware v.10.03 (571 KB) 09-04-2018

Current NL200 / NL201 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 Update History

Frequently Asked Questions

Number of FAQs related to NL200: 2

  1. The NL200-series of devices can be set to bridge the Ethernet or Wi-Fi interface and the CS I/O interface. All packets that come into the device via Ethernet or Wi-Fi will be transferred to the data logger over the CS I/O port. This enables the data logger to make all of its IP-related services available. Configuring an NL200-series device with bridge mode enabled is analogous to adding a native Ethernet or Wi-Fi port to the data logger. Bridge mode does not use PPP.

  2. The maximum recommended segment length (length of cable between the NL device and the Ethernet repeater, hub, switch, or router it is connected to) for 10Base-T and 100Base-Tx networks using CAT5e cable is 100 m. 

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