The RF422 is an 868 MHz SRD860 radio designed to provide license-free operation for wireless serial communications in Europe. The RF422 transmits data at 10 kbps with a maximum power of 25 mW, and it employs listen-before-talk (LBT) and adaptive-frequency-agility (AFA) to provide a robust link of up to 5 km (line-of-sight). The RF422 supports point-to-point and point-to-multipoint datalogger communications and PakBus repeater operation.
The RF422 is part of the RF407-series of radios that includes:
Campbell Scientific recommends installing the RF422 868 MHz radio at least 200 m (656.2 ft) from any 4G LTE cellular transmitter, including towers and cellular modems/gateways.
|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|
|Power Output||2 to 25 mW (software-selectable; assuming 2 Bi antenna gain)|
|Receiver Sensitivity||-106 dBm|
|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|
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.
|Channel Spacing||100 kHz|
|Receiver Bandwidth||150 kHz|
|Modulation Bandwidth||< 300 kHz|
|LBT Threshold||< -88 dBm|
|TX on Time||< 1 s|
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.
*Use a 18663 null modem cable.
**It is possible to connect a mixed-array datalogger (e.g., CR10, CR10X, CR23X, 21X, CR7) by using an SC932A or SC105 between the datalogger's CS I/O port and the RF422's RS-232 port.