Xylem H-4280 - Manual (Page 23)

H-4280
SDI-12 Command and Response Protocol 3-11
The extended Read Channel_Config command prints a status message showing the settings for a
selected channel. The response can be seen with most data loggers which implement a
“transparent SDI-12" mode.
Command: "aXRCn!"
Where: a is the sensor address ("0-9", "A-Z", "a-z", "*", "?").
XRC are upper case characters.
n channel number (0-7)
The response is a message showing the current status of the channel settings.
Example of a H-4280 Extended "Read Channel Config" command:
Command & Response
0XRC5! Chan 5: Unipolar, Single, Digits=3, Slope=1.000, Offset=0.000
Where:
Unipolar 0 to 5.0 Volts (resolution is 1.2mV)
Bipolar ±5.0 Volts (resolution is 2.4mV)
Single Measurement is referenced to ground
Differential Measures the difference between two adjacent input channels (0-1, 2-3, 4-5, 6-7)
Digits The number of digits to the right of the decimal point to be printed when making
SDI-12 measurements
Slope The “m” term in the y=mX+b function for this channel
Offset The “b” term in the y=mX+b function for this channel