Seametrics INW CT2X, Instructions Manual

Page: 18 / 28

CT2X INSTRUCTIONS
Seametrics • 253.872.0284 Page 18 inwusa.com
SDI-12 Commands
Sensor Identification
<a>I! <a>13 INWUSA CT2X 215 ssssssssss <cr><lf> Note: 215 will change to reflect current
firmware version.
ssssssssss = device serial number
Acknowledge Active, Address Query
<a>! <a><cr><lf>
?! <a><cr><lf>
Change Address
<a>A<b>! <b><cr><lf> Change address to <b>
Request Measurement
<a>M! <a>0024<cr><lf> Request all basic measurements
<a>D0! <a> +22.0512+155.0127+155.2155+12.0512 <cr><lf> Read: temperature, conductivity (linear),
conductivity (nLFn), pressure
<a>M1! <a>0021<cr><lf> Request temperature measurement only
<a>D0! <a> +22.0512 <cr><lf> Read temperature
<a>M2! <a>0021<cr><lf> Request linear conductivity measurement only
<a>D0! <a> +155.0127 <cr><lf> Read linear conductivity
<a>M3! <a>0021<cr><lf> Request nLFn conductivity measurement only
<a>D0! <a> +155.0127 <cr><lf> Read nLFn conductivity
<a>M4! <a>0021<cr><lf> Request pressure measurement only
<a>D0! <a> 12.0512 <cr><lf> Read pressure
<a>M5! <a>0021<cr><lf> Request salinity measurement only
<a>D0! <a> +20.7862 <cr><lf> Read salinity
<a>M6! <a>0021<cr><lf> Request TDS measurement only
<a>D0! <a> 14700.9 <cr><lf> Read TDS
Reading via SDI-12
Note: The default units setting for pressure is PSI. The default units setting for temperature is Celsius.
To change these, use the Direct Read Units in the Aqua4Plus/Aqua4Plus Lite Control Software. Note: Conductivity is
always returned in µS/cm, Salinity in PSU, and TDS in mg/L.
DIRECT READ MODBUS & SDI-12
Addressing
Default SDI-12 Address: 0
SDI-12 Command Nomenclature
<a> = Sensor address
{crc} = SDI-12 compatible 3-character CRC
<cr> = ASCII carriage return character
<lf> = ASCII line feed character
highlighted values indicate variable data
All SDI-12 requests consist
of a command followed by
a request for values. Some
software or equipment may
combine these, making the
second one unnecessary. Refer
to your software or equipment
documentation for details.
<a>D0! <a> +7.15863 <cr><lf>
Request Response
Address
Request for
Address
Returned
value(s)
Carriage Return
Linefeed
values read
<a>M1! <a>0021<cr><lf>
Request Response
Address
Command
Address
Time until
response
Carriage Return
Linefeed
# of values to
be returned
(in seconds)