Digi XBee SX RF Modems
900 Mhz RF Modem
Digi XBee-enabled devices to extend interfaces
1-Watt industrial-grade 900 MHz RF modem with best-in-class range and power consumption for wireless cable replacement.
When you need to punch through noisy environments and cover long distances, Digi XBee® SX 1-Watt 900 MHz RF modems provide combination reliability and redundancy for integrators building low-power, mission-critical wireless systems. With interface options including RS232/485 or Digital/ Analog I/O, these modems utilize the DigiMesh® wireless networking protocol, with redundant mesh network operation and support for low-power sleeping nodes.
Customers that don’t require mesh network architecture can configure the modem to operate in simple point to multipoint mode. With an ideal RF line-of-sight range estimated up to 65 miles*** and strong interference blocking, these modems are ideal for applications requiring a reliable, redundant wireless cable replacement over longer ranges.
The Digi XBee SX modems can be configured easily via the USB port, using Digi’s free XCTU software. They are precertified for use in multiple countries and provide secure, reliable delivery of critical data between devices with 256-bit AES encryption.
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Key Features
- Adjustable output power up to 1-Watt achieves up to 65-mile range*** with high gain antenna
- Interfaces options include RS-232, RS-485, USB, Analog I/O, and Digital I/O
- DigiMesh® networking topology for redundancy and reliability
- 256-bit AES encryption for secure data communications
- Rugged metal enclosure and -40º C to 85º C operating temperature for industrial applications
- Fully certified for use in free, unlicensed 900 MHz band
How it Works
XBee SX RF Modems Applications
- Oil and gas
- Water/wastewater
- Solar
- Agriculture
- Other industrial applications.
Product Specifications
| Specifications | Digi XBee SX RF Modems |
| PERFORMANCE | |
| INDOOR/URBAN RANGE*** | Up to 18 km (11 mi)* at low data rate |
| OUTDOOR/RF LINE-OF-SIGHT RANGE*** | Up to 105 km (65 mi)** at low data rate |
| TRANSMIT POWER | Up to 30 dBm software selectable |
| RF DATA RATE (SOFTWARE SELECTABLE) | Low data rate: 10 kbps; Middle data rate: 110 kbps; High data rate: 250 kbps |
| RECEIVER SENSITIVITY | Low data rate: -113 dBm; Middle data rate: -106 dBm; High data rate: -103 dBm |
| RECEIVER IF SELECTIVITY | Low data rate: 40 dB @ 250 kHz; 50 db @ 500 kHz Middle data rate: 30 dB @ 250 kHz; 40 db @ 500 kHz High data rate: 30 dB @ 500 kHz; 45 db @ 1000 kHz |
| RECEIVER RF SELECTIVITY | Below 900 MHz and above 930 MHz: >50 dB |
| NETWORK AND SECURITY | |
| FREQUENCY RANGE | ISM 902 MHz to 928 MHz |
| SPREAD SPECTRUM | Frequency hopping |
| SUPPORTED NETWORK TOPOLOGIES | Mesh, Point-to-point, Point-to-multipoint, Peer-to-peer |
| MODULATION | Gaussian Frequency Shift Keying (GFSK) |
| ENCRYPTION | Optional 256-bit Advanced Encryption Standard (AES) cipher block chaining (CBC) Encryption |
| ANTENNA | |
| CONNECTOR | RPSMA |
| ANTENNA IMPEDANCE | 50 Ω unbalanced |
| INPUT LEVEL AT ANTENNA PORT | Maximum 6 dBm |
| POWER REQUIREMENTS | |
| SUPPLY VOLTAGE RANGE | 7-30 VDC |
| TYPICAL SUPPLY VOLTAGE | 12 V |
| RECEIVE CURRENT | 20 mA (@12V) |
| TRANSMIT CURRENT | 300 mA (@12V) |
| SLEEP CURRENT | 5 mA (@12V) |
| PHYSICAL PROPERTIES | |
| SIZE | 4.5 in x 2.75 in x 1.125 in (11.4 cm x 7 cm x 2.9 cm) |
| WEIGHT | 5 oz (142 g) |
| DATA CONNECTION | Female RJ-45 (RS232/485), 10-pin screw terminal (4 digital, 4 analog, GND, 12 VDC output), USB mini-B (configuration port) |
| OPERATING TEMPERATURE | Industrial: -40° C to 85° C (-40° F to 185° F) |
| REGULATORY APPROVALS | |
| FCC (U.S.A) | MCQ-XBPSX |
| IC (CANADA) | 1846A-XBPSX |
| C-TICK (AUSTRALIA) | RCM |
| ROHS | Compliant |
| ANALOG INPUTS | |
| ABSOLUTE VOLTAGE RATING | Maximum: 11 V; Minimum: -.05 V (each pin) |
| OPERATING INPUT RANGE | Single-ended voltage mode: 0 - 10 VDC Current loop mode: 4 - 20 mA Differential voltage mode: ± 4 VCD |
| INPUT IMPEDANCE | Single-ended voltage mode: 13300 Ω Current loop mode: 120 Ω Differential voltage mode: ~1 MΩ |
| RESOLUTION | 10 bits |
| ACCURACY | .5% at 25º C |
| DIGITAL INPUTS | |
| INPUT TYPE | Non-inverting Schmitt trigger gate |
| POSITIVE-GOING SWITCHING THRESHOLD | 2.5 V |
| NEGATIVE-GOING SWITCHING THRESHOLD | 1 V |
| ABSOLUTE VOLTAGE RATING | Maximum: 31 V; Minimum: -.05 V (each pin) |
| INPUT IMPEDANCE | ~1 MΩ |
| DIGITAL OUTPUTS | |
| OUTPUT TYPE | Open collector sinking driver |
| MAXIMUM SINK CURRENT | 200 mA |
| MAXIMUM SUPPLY VOLTAGE | 31 V (for external pull-up resistor) |
| RESISTOR PULL-UPS | 10 kΩ pulled up to 3.3 VDC |
* We estimate rural ranges based on a 14.5 km (9 mi) range test with dipole antennas.
**Range estimated assuming that the urban noise floor is approximately 15 dB higher than rural. The actual range depends on the setup and level of interference in your location.
***Range figure estimates are based on free-air terrain with limited sources of interference. The actual range will vary based on transmitting power, the orientation of transmitter and receiver, the height of transmitting antenna, the height of receiving antenna, weather conditions, interference sources in the area, and terrain between receiver and transmitter, including indoor and outdoor structures such as walls, trees, buildings, hills, and mountains.
DATASHEETS
Data Sheet: Digi XBee SX RF Modems
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