Bringing the Benefits of Real-Time Data Collection to the World
Sutron Corporation, 22400 Davis Drive, Sterling, Virginia 20164-4444
11
a13 SUTRON 0120-11.0sssssssVvvv
a
13
SUTRON
0120-1
1.0
sssssss
Vvvv
Where:
SDI-12 address
supports SDI version 1.3 commands
manufacturer SUTRON
Sutron model number
hardware revision level
sensor serial number
the software revision
If you do not get a reply, check the address setting for the ACCUBAR
®
and make sure you use the proper address for
the sensor.
Commands (Overview)
The commands to set up and operate the ACCUBAR
®
are those defined by the SDI specifications 1.0 plus
some extended commands defined by Sutron. All commands start with a single-character address and end
in an exclamation point. The address is a single character with values 0 to 9, :;<=> ?, A to Z, and a to z.
Values are entered in the form of a polarity (+ or -) sign followed by up to seven digits, including a decimal
point. The commands are in ASCII and all the replies use printable ASCII characters followed by <CR>
<LF>.
The ACCUBAR
®
replies to all SDI commands it supports. If the ACCUBAR
®
receives a command it does
not support, no reply is made. The reply will have one of two forms:
a0000
where a is the address and the 0000 indicates that there is no
further message to send
or
atttn
and
a
where a is the address, ttt is the amount of time, in seconds,
the ACCUBAR
®
needs to make the measurement or process
the command and n is the number of values that can be
collected. In this form the sensor will also respond with its
address when the data is ready to collect. This response is
called a service request.
If you issued the
change address
command or the
identify
command described in the previous sections, you
already have some experience with using ACCUBAR
®
commands. There are other commands available to
make measurements, set the type of output units for the measurements, perform special scaling of the
measurements, etc. The following sections describe the commands by function.
