Überblick
Das RF422 ist ein 868 MHz SRD860 Funkmodem, dass in Europa lizenzsfrei eingesetzt werden kann. Das RF422 überträgt Daten mit 10 kbps mit einer maximalen Leistung von 25 mW und unterstützt Listen-before-talk (LBT) und Adaptive-Frequency-Agility (AFA) um eine stabile Verbindung über bis zu 5 km (Sichtverbindung) aufzubauen. Das RF422 ermöglicht Punkt-zu-Punkt und Punkt-zu-Multipunkt Datenlogger-Kommunikation und den Einsatz als PakBus Repeater.
Das RF422 ist Teil der RF407-Reihe, von der es außerdem gibt:
- RF407: Nordamerika (FCC & IC), 902 bis 928 MHz
- RF412: Australien (ACMA RCM), 915 bis 928 MHz
- RF422: Großteil von Europa und Teile Asiens (ETSI), 863 bis 870 MHz
- RF427: Brasilien (ANATEL) 905/920MHz
Funktionen und Vorteile
- In Europa ist keine Lizenz notwendig.
- Robuste serielle Kommunikation, optimiert für PakBus Netzwerke
- Geringer Stromverbrauch (< 2 mA idle) bei Inaktivität
- Unterstützt Punkt-zu-Punkt Funkverbindung mit erneuten Versuchen und Punkt-zu-Multipunkt Verbindungen
- Ferndiagnose über PakBus- Knotenpunkte
- Stromversorgung über USB wenn am PC angeschlossen
Bilder
Technische Beschreibung
System Components
An RF422 radio needs to be at both the base station and field site. Each radio requires an antenna that does not exceed 2.1 dBi in gain over the 863 to 870 MHz frequency range, such as the 28767 whip antenna offered by Campbell Scientific.The RF422 has a reverse polarity SMA (RPSMA) connector for attaching the antenna or antenna cable.
Powering the Radio
At the base station, the radio typically uses ac power that is either supplied by the 15966 wall charger or through the PC via the USB port and cable. At the field site, the radio is typically powered by the data logger through the CS I/O port. The 14291 Field Cable can also be used to connect the radio to an appropriate 12 Vdc power supply. This field cable is required when the radio is connected to the data logger’s RS-232 port instead of the CS I/O port.
Spezifikationen
| Radio Type | SRD860, LBT+AFA |
| Restrictions | See REC70-03E, CEPT recommendation on the use of SRD. |
| Compliance | Listen before talk (LBT) and automatic frequency agility (AFA) to comply with ETSI duty cycle requirements. Radio communication effective duty cycle = (number of channels * 100) / 3600. |
| Channel Capacity | 30 channels (default), software configurable for the purpose of meeting local regulations; 10 sequences for reducing interference through channel hop. |
| Frequency | 863 to 870 MHz |
| Country Used In | EMEA (Europe, Middle East, and Africa) |
| Transmission Distance |
|
| Power Output | 2 to 25 mW (software-selectable; assuming 2 dBi antenna gain) |
| Receiver Sensitivity | -106 dBm |
| RF Data Rate | 10 kbps |
| Link Throughput | 8 kbps |
| 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 |
| Power | 9 to 16 Vdc |
| Power Connector | 2.5 mm dc power jack |
| Operating Temperature Range | -40° to +70°C |
| Certifications |
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| Average Current Drain |
|
| Communication Ports |
|
| Service Requirements | Shares frequency with other devices. Must not cause harmful interference to licensed radios. Requires line-of-sight. |
| Dimensions |
11.1 x 6.9 x 2.7 cm (4.4 x 2.7 x 1.1 in.) Dimensions 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 |
|
LBT+AFA Performance |
|
| Channel Spacing | 100 kHz |
| Receiver Bandwidth | 150 kHz |
| Modulation Bandwidth | < 300 kHz |
| LBT Threshold | < -88 dBm |
| TX on Time | < 1 s |
Kompatibel mit
The RF422 is over-the-air compatible with other RF422-based products. The RF422 can only communicate wirelessly with other RF422 radios and other Campbell Scientific products that have the "-RF422" option.
Data Logger Considerations
| Data Logger | RS-232 | CS I/O |
| CR200(X) |  |
|
| CR800/CR850 | |
|
| CR1000 | |
|
| CR3000 | |
|
| CR5000 | |
|
| CR9000(X) | |
|
| CR300 | * |
|
| CR6 | |
|
| CR510-PB | |
|
| CR10X-PB | |
|
| 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 RF422's RS-232 port.
