What do you do when the cable doesn't reach?
SDI-12 is a serial protocol used in dataloggers and environmental instruments. It is simple and reliable, but cables are limited to 200 feet. The ProLink Radio allows SDI-12 communication across greater distances.
Each ProLink contains a 900 MHz radio module, transmitting at 1000 milliwatts. This is the maximum power allowed without a license. Range up to 32 km, line-of-sight.
No setup is required. The ProLink is a drop-in cable replacement, and will work with all loggers and instruments that comply with the SDI-12 protocol version 1.3.
ProLinks are shipped as dedicated pairs for point-to-point applications. Other topologies are possible, including star-networks. At any point in the network, a single ProLink can transmit and receive commands to any number of SDI-12 instruments.
ProLinks will transmit and receive all SDI-12 commands. Each ProLink can also be polled as an independent SDI-12 instrument, measuring battery voltage, internal temperature, and RSSI (signal strength).
An optional power-save feature allows the ProLinks to sleep between SDI-12 polls. This reduces power consumption and extends battery life.
| Parameter | Specification |
|---|---|
| Frequency band, modulation | 902-928 MHz, FHSS (North America);
915-928 MHz, FHSS (Australia/New Zealand) |
| Dimensions | 4.4 x 2.7 x 1.4 inches (111 x 69 x 36 mm) |
| Weight | 6 oz (170 g) |
| Antenna | RP-SMA jack (female). Antenna provided |
| SDI-12 interface | Pluggable screw terminal (12-volt, ground, SDI-12 data) |
| Configuration interface | Serial RS232 DB9 male connector, null-modem |
| Maximum RF output power | 1000 mW |
| Transmission range | Up to 1500 feet (450 m) indoors;
Up to 20 miles (32 km) line-of-sight |
| Supply voltage | 7-18 volts DC, 12 volts nominal |
| Current draw (@ 12V) | 400 mA transmit mode (brief pulses);
35 mA receive mode (active mode); 0.13 mA sleep (passive mode) |
| Waterproof | No |
Reverse-polarity protection | Yes |
Environmental conditions | Operating temperature -40° to +80° C; |
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