RS485-SDI12 Documentation

Knowledge Base

NexSens RS-485 to SDI-12 Signal Adapter User Guide


The NexSens RS-485 to SDI-12 Signal Adapter (RS485-SDI12) is designed for use with NexSens T-Node and NX260 sensors for converting Modbus RS-485 to SDI-12.

NexSens RS-485 to SDI-12 Signal Adapter (RS485-SDI12).

Wiring

Follow the NexSens UW Receptacle to Flying Lead Cables Wiring Guide for cable wiring and setup.

 

SDI-12 Commands

SDI-12 Command Response Description
?! a<CR><LF> Query SDI-12 Address
aI! allcccccccmmmmmmvvvxx<CR><LF> Identification
aM! atttn<CR><LF> Measurement
aC! atttnn<CR><LF> Concurrent Measurement
aD0!…aD9! 0+79.5+0.008+0.988+0.92 Request Data

*Note: NexSens T-Node strings are considered one sensor with multiple parameters totaling the number of nodes; so only one measurement command should be sent to the address of the first T-Node.

SDI-12 Addresses

SDI-12 address Modbus address Notes
‘0’ NA Reserved to communicate with the converter itself