Reading Via Sdi-12 - Seametrics TempHion Instructions Manual

DIRECT READ MODBUS & SDI - 12

Reading via SDI-12

SDI-12 commands always return values for all four TempHion channels – temperature, pH, ORP, and ISE channels.
Most TempHions are configured either as temperature, pH, and ORP or just temperature and Bromide. You will need to
disregard the readings for the channel(s) you do not have configured on your unit.
Note: The default units for temperature is Celsius. To change this, use the Direct Read Units option in the Aqua4Plus
Control Software. When using the M!, MC!, C!, or CC! command, all mV channels will report in either pH, ppm, or Eh,
depending on the channel type (pH = pH, ORP = Eh, ISE = ppm). When using the M1!, MC1!, C1!, or CC1! command, all
mV channels will report in mV.
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
Note: For firmware version 2.0–2.3, the M!
and M1! commands are reversed. Likewise
for the MC!/MC1!, C!/C1!, and CC!/CC1!
commands.
SDI-12 Commands
Sensor Identification
<a>I! <a>13 INWUSA TempHi206ssssssssss<cr><lf>
Acknowledge Active, Address Query
<a>! <a><cr><lf>
?! <a><cr><lf>
Change Address
<a>A<b>! <b><cr><lf>
Request Measurement
<a>M! <a>0024<cr><lf>
<a>D0! <a>+21.345+7.181+.053+.459<cr><lf>
<a>M1! <a>0024<cr><lf>
<a>D0! <a>+21.345-134.458+100.48+.84.404<cr><lf>
Seametrics • 253.872.0284
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.
Page 19
TEMPHION INSTRUCTIONS
Request Response
<a>M1! <a>0021<cr><lf>
Address Address
Command Time until
response
(in seconds)
Request Response
<a>D0! <a>+7.15863<cr><lf>
Address Address
Request for Returned
value(s)
values read
Note: 206 will change to reflect current
firmware version.
ssssssssss = device serial number
Change address to <b>
Request all measurements
Read: temperature, pH (in pH units), (ISE in
ppm), ORP (in Eh)
Request all measurements
Read: temperature, pH (in mV), (ISE in mV),
ORP (in mV)
Carriage Return
Linefeed
# of values to
be returned
Carriage Return
Linefeed
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