NL900PRO Radio Modem

  • Overview
  • Specifications
  • Serial Interface
  • Support

The NL900PRO transceiver is a Frequency-Hopping Spread Spectrum (FHSS) radio designed for license-free operation in the 900 MHz ISM band. The radio sustains a standard asynchronous serial data stream between two or more radios out of the box. Housed in a compact and rugged die-cast enclosure, the radio is equipped to replace miles of serial cable using a selectable RS232, RS485, or RS422 interface.

Powered by a 1000mW 900 MHz radio, each NL900 unit is small and easily portable for use in mobile and temporary settings as well as for fixed installations. Included software enables custom configurations based on user needs.

This modem implements a proprietary communication protocol to provide secure local data transmissions. Because it uses FHSS technology, the data remains reliable over distances of up to 10 miles line-of-sight (900 MHz). Use of a license-free frequency band ensures that the NL900 is ready to use with no further certification requirements. Every unit is backed by a 30-day guarantee and full warranty with technical support.

RF Protocol, Acknowledgement (ACK) Transmitted packets are successfully acknowledged. If not, they are resent until successful (user selectable number of retries). Error detection is used and duplicate data filtered out before sending to the host interface. Optional full duplex control setting allows equal time for transmitting and receiving data at the RF level, keeping a single transmitter from dominating the system bandwidth.

RF Addressing Modes, Unicast (one-to-one addressing) and Broadcast (one-to-many addressing)

RS232 Transparent , Change configuration commands, Configuration can be changed through a command/data interface signal or AT commands. Change-on-the-fly parameters include base or remote designations, destination MAC address, channel number (to communicate with a different base), enter/exit low-power modes, etc. Custom settings are available by user request.

Data Encryption Standard (DES), DES uses an established algorithm and a 56-bit key stored in onboard EEPROM. to protect data. Available in 900 MHz version only.

Set up and Operation, the complete system is comprised of a central base and any number of remote nodes that can operate in point-to-point or point-to-multipoint networks. Multiple sub-networks can be created by assigning unique radio addresses to specific device groups. RF Neulink is available to support in-system design and applications.

Technical Specifications

Serial Interface Connector DB-9 Female
RF Connector RPSMA Jack
Impedance 50 Ohms unbanced
Serial Interface Data Rate Baud rates from 1200 bps to 115,200 bbp
Power Consumption (typical) 400 mA @
Channels 52 (USA); 7 (Australia)
Supported Network Topologies Point-to-Point, Point-to-Multipoint
Security One byte System ID. 56-bit DES encryption key
Interface Buffer Size Input/Output: 1600 bytes each
Frequency Band 902 - 928 MHz (USA); 915 - 928 Mhz (Australia)
RF Data Rate 76.8 kbps fixed
RF Technology Frequency Hopping Spread Spectrum
Output Power NL900PRO: Conducted (No antenna) 743mW typical
Eirp (3dBi gain antenna) 1486mW typial
Supply Voltage NL900PRO: 7-28VDC
Sensitivity -100dBm typical @
Range, Line of Site (based on 3dBi gain antenna) NL900PRO: Up to 20 miles
Temperature (Operating) -40°C to 80°C
Temperature (Storage) -50°C to +85°C
Dimensions 4.4 x 2.7 x 1.4 inches
Weight 6 oz (170g)
FCC Part 15.217 NL900PRO: KQLAC1190
Industry Canada (IC) NL900PRO: 2268C-AC44901000

Download Spec Sheet and User Manual for more information

For outside operation of radio modem products a NEMA 4 enclosure is recommended.

RF Neulink reserves the right to change specifications of this product at any time without notice and without obligation to notify any person of such changes. For outside operation of radio modem products a

The NL900PRO supports RS232, RS485, and RS422 protocols. RF Neulink wireless solutions are not subject to the cabling restrictions for distance, and either interface is available when ordering.

NL900PRO Status LEDs
NL900Pro Status LED Diagram
Status LEDs
Led Color Description
Pwr Green On indicates that the unit is powered up.
Link Red On indicates that the Client unit(s) and Server unit are in range of each other. Client units activate the link LED when in Range of the Server unit. Always lit on a Server unit.
RXD Green When flashing, indicates that the NL900PRO is receiving data.
TXD Red When flashing, indicates that the NL900PRO is transmitting data.
NL900PRO DIP Switch Settings
NL900Pro DIP Switch Settings

Download DIP Switch Settings

Contact Us

Telephone: 858-549-6340
Toll Free 800-233-1728
Fax 858-549-6349


More Information


Industrial Wireless Modems

  • Replace miles of serial cable using a selectable RS232, RS485, or RS422 interface
  • Transmits around corners, through walls and obstructions
  • Reliable communication at rates from 1,200 - 115,200 bps


Other 900 MHz Product

  • Control Engineering Awared