FTS 21216, Руководство по эксплуатации

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700-SDI-RADAR-LX-80-Man Rev 1 08 Oct 2021 21 /49
DATA PROTOCOLS
The LX-80 level meter supports the following data protocols:
1) SDI-12 protocol over SDI-12 interface
2) NMEA-like protocol on RS-232 interface that constantly outputs the detected current
level and averaged level, depending on the active settings for data filtering
3) Servicing protocol on RS-232 interface for configuring the unit
4) Request-response protocol (Modbus) on RS-485 interface that allows multiple units to be
used on a single RS-485 bus
7.1 SDI-12 PROTOCOL
The LX-80 is capable of reading and writing with the standard set of SDI-12
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commands. The
following basic SDI-12 commands are implemented in the radar sensor. Note the “a” in each
command should be replaced with the sensor address number and every command must terminate
with an exclamation mark (!).
Name Command Response and Details
Address Query ?! a
Device responds with its SDI-12 address. Default address is 0 (zero )
Acknowledge
Active a! a
Sensor at input address “a” is active
Address
Change aAb! b
Device at address ”a” has changed address to “b”
Send
Identification aI! a13ccccccccmmmmmmvvvxxx . . . xxx
13 - the SDI-12 version number
cccccccc - 8 character vendor identification
mmmmmm - 6 characters specifying the sensor model number
vvv - 3 characters specifying the sensor firmware version
Start
Verification aV! One value is ready imminently.
0 indicates not ready
1 indicates ready
Verification values can be retrieved by the Send Data Command
Send Data aD0! a<values>
7.1.1 MEASUREMENT COMMANDS
These commands tell the sensor to take a measurement. The sensor returns the time until one or
more measurements will be ready and the number of measurements that it will make. It does not
return the measurement to the data recorder after this command. The send data (D0!) command
must be issued to get the measurement values.
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For a detailed explanation of SDI-12 protocols and commands refer to SDI-12 Specification, Version 1.3 at
http://www.sdi-12.org