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© 2020, Electrolab, Inc. March 2020
Digital Level Sensor Protocol
Command syntax

Uppercase characters denote literals in the command and response streams.

Lowercase characters represent data fields in the command and response
streams. Further explanation of data field structure is provided as necessary
with each command.

All commands are terminated with carriage return <cr>.

All responses are terminated with Ccccc (cccc=16 bit CRC field in hexadecimal)
followed by a carriage return linefeed pair <cr><lf>. All alpha hexadecimal
characters are lowercase.

The prefix to all commands and responses is Uuu where uu is the unit number (00-
31). The unit number is the identity of the level sensor to which a command is
addressed or which generates the response. ‘*’ may be used as a wild card character
for either digit in the unit number field ‘uu’. The responding level sensor will always
convert wildcard characters to the actual unit number.

Commands, which modify a level sensor configuration, always return the
command string and ‘OK’ if successful. ‘EEerr’ replaces ‘OK’ if there is a
problem storing the configuration data in the level sensor EEPROM.
Data Request Commands
Report Level and Temperature
Uuu?
uu is a two-digit unit number from 00 to 31( “*” may be used as a wildcard for either digit)
Note: Do Not use the wildcard “**” if connected to more than one level sensor, as all sensors
will respond simultaneously.
Response: UuuDlll.llFtttEeeeeWwwww
uu = unit number
lll.ll = level in inches (repeated for sensors with 2 floats)
ttt = temperature in degrees F
eeee = error number
0 = No errors
1= No float detected
2 = One float is out of range on a two-float sensor
3 = Too many groups
4 = (reserved)
5 = Transmit to slave processor for level failed
6 = Transmit to slave processor for temperature failed
7 = Receive from slave processor of level failed
8 = Receive from slave processor of temperature failed
9 = No slave processors responding