SPECIFICATIONS

This SDI-12 protocol converter has been on the market for over a decade. It features a complete range of interfaces, is stable and reliable, has low power consumption, and a long transmission distance (as measured by customers, it can reach up to 450 meters). It is equipped with multi-directional safety protection circuits. Customers have put it into practical use in batches, with a cumulative sales volume of over 1,500 sets. The product supports all SDI-12 interface sensors. The customer has put it into application in diverse climates and geographical environments, and has withstood the tests of harsh conditions such as extreme temperature differences, high altitudes, and strong sandstorms.

1. SDI-12 commands may be issued to SDI-12 protocol-compliant sensors via RS232, TTL (shared with RS232) or RS485 serial ports, with responses returned through the serial interface. Bidirectional data on the SDI-12 protocol bus may also be captured;

2. The baud rate is adjustable within the range of 600–921,600 bps. User-set baud rates are stored in memory and remain intact after power loss. Supports LED flashing modes, operational mode configuration, and other functions;

3. Conversion Modes: Supports transparent conversion between RS232 (shared TTL/RS232 interface), RS485, and SDI-12 protocols;

4. Protocol Standard: Supports SDI-12 version 1.3 and above;

5. Power Supply: External DC 3.6V–14V input;

6. Operating Current: Standby current approximately 2mA.

Method of Use:

(1) Select one interface type—RS232, TTL, or RS485—to connect to a computer or other data acquisition device;

(2) Connect the SDI-12 sensor;

(3) If connecting to a computer, open any serial port debugging assistant, select the appropriate serial port number, set the baud rate to 9600, 8, N, 1, then send sensor commands in ASCII text format.

Refer to the diagram below.

! is the command to query the sensor address

! is the command to retrieve sensor information