Overview
The RF427 is a high-speed 900 MHz serial radio designed for unlicensed operation in Brazil. The RF427 is a frequency-hopping spread-spectrum radio with a configurable transmit-power output of 5 to 250 mW and user-selectable channel masking for improved RF interference immunity. This power-sipping, yet speedy, radio provides a cost-effective way to network data loggers.
The RF427 is part of the RF407 series of radios that includes:
Benefits and Features
- Does not require individual operational license in Brazil
- High-speed serial communication, optimized for PakBus networks
- Low power (< 2 mA idle) during periods of inactivity
- Supports point-to-point with RF retries and point-to-multipoint operations
- Remote diagnostics using PakBus node operations
Images
3D/CAD Files:
Related Products
Specifications
| Radio Type | Frequency Hopping Spread Spectrum (FHSS) |
| Frequency | 905/920 MHz |
| Country Used In | Brazil |
| Transmission Distance |
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| Power Output | 5 to 250 mW (user-selectable) |
| Receiver Sensitivity | -101 dBm |
| Channel Capacity | Eight 25-channel hop sequences sharing 43 available channels |
| Data Rate | 200 kbps |
| Link Throughput | 105 kbps (maximum) |
| Antenna Connector | Reverse Polarity SMA (RPSMA) jack |
| LEDs | Red TX/PWR and green RX |
| RS-232 Baud Rate | 1200 to 115200 bps |
| CS I/O Modes | SDC 7, 8, 10, 11, and ME master |
| Operating Temperature Range | -40° to +70°C |
| Power | 9 to 16 Vdc |
| Power Connector | 2.5 mm DC power jack |
| Powered Over | CS I/O or barrel plug |
| Maximum Nodes in Network | 50 |
| Current Required |
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| Communication Ports |
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| Dimensions |
11.1 x 6.9 x 2.7 cm (4.4 x 2.7 x 1.1 in.) Dimension are from the tip of the antenna connector to the other side of the case, and from the bottom of the case to the top of the DB9 connector jack screw. The width includes the thickness of the screw heads on the screws that hold the case together. |
| Weight |
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Certifications |
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| Brazil (ANATEL) | 08335-17-10644 (standards in Resolution No. 506) |
Compatibility
Communications
The RF427 is over-the-air compatible with other RF427-based products. The RF427 can only communicate wirelessly with other RF427 radios and other Campbell Scientific products that have the "-RF427" option.
Data Logger Considerations
| Data Logger | RS-232 | CS I/O |
| CR200(X) |  |
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| CR800/CR850 | |
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| CR1000 | |
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| CR3000 | |
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| CR5000 | |
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| CR9000(X) | |
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| CR300 | * |
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| CR6 | |
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| CR510-PB | |
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| CR10X-PB | |
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| CR23X-PB | |
|
| Mixed-array data loggers | ** |
Notes:
*Use a 18663 null modem cable.
**It is possible to connect a mixed-array data logger (e.g., CR10, CR10X, CR23X, 21X, CR7) by using an SC932A or SC105 between the data logger's CS I/O port and the RF427's RS-232 port.
Related Documents
Technical Papers
Related FAQs
Number of FAQs related to RF427: 1
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If you have an RF401/RF401A/RF407/RF411A/RF412/RF427 network that has been working reliably for months and then suddenly fails with intermittent data collection, the site hasn’t changed, and there hasn’t been any new construction in the area, the issue may be caused by a piece of new equipment that was installed on the job site during the COVID-19 pandemic.
Because of the COVID-19 pandemic, some job sites implemented badge sensor technology for contact tracing and social distancing. Often, these devices operate on Wi-Fi or Bluetooth, but some of them operate in the 900 MHz range, which is used by our spread-spectrum radios and can, therefore, cause interference. Fortunately, you can resolve this issue using radio channel masking.
The following outlines the steps that were taken to correct this issue in one specific example:
- The datasheet for the COVID-19 badge equipment was found and reviewed to determine that it was operating from 915 to 926 MHz.
- The manual for the RF407 900 MHz Spread-Spectrum Radio was reviewed. The manual reported the frequency for bit 0 and bit 63 as 902.4 MHz and 927.6 MHz with a channel spacing of 400 KHz.
- Using a mathematical calculation, it was determined that masking channels 31 to 60 would block off 914.8 MHz up to 926.4 MHz.
- Entering 0000000000000000000000000000001111111111111111111111111111110000 into a binary-to-hex converter provided a mask of FFFFFFFC0000000F. (The default Calculator app provided by Windows has a Programmer option listed under the hamburger menu that you can use for the conversion.)
- The mask of FFFFFFFC0000000F was used in the Radio Channel Mask setting, and the radio network returned to providing reliable operation.
For more detailed information about using radio channel masking, refer to your spread-spectrum radio manual. For example, the RF407-Series manual has a section devoted to this topic.