56
14 Supplement
VEGAPULS C 21 • Modbus and Levelmaster protocol
58343-EN-200806
Parameter CongurableValues Default Value
Start Bits 1 1
Data Bits 7, 8 8
Parity None, Odd, Even None
Stop Bits 1, 2 1
Address range Levelmaster 32 32
The Levelmaster commands are based on the following syntax:
•
Capitallettersareatthebeginningofcertaindataelds
•
Smalllettersstandfordataelds
•
All commands are terminated with " <cr>" (carriage return)
•
All commands start with " Uuu", whereby " uu" stands for the address (00-31)
•
" *" can be used as a joker for any position in the address. The sensor always converts this in
its address. In case of more than one sensor, the joker must not be used, because otherwise
several slaves will answer
•
Commands that modify the instrument return the command with " OK“. " EE-ERROR" replaces "
OK"iftherewasaproblemchangingtheconguration
Report Level (and Temperature)
Parameter Length Code/Data
Request: Report Level (and Tem-
perature)
4 characters ASCII Uuu?
Response: Report Level (and Tem-
perature)
24 characters ASCII UuuDlll.llFtttEeeeeWwwww
uu = Address
lll.ll = PV in inches
ttt = Temperature in Fahrenheit
eeee = Error number (0 no error, 1
level data not readable)
wwww = Warning number (0 no warn-
ing)
PV in inches will be repeated if " Setnumberofoats" is set to 2. Hence 2 measured values can be
transmitted.PVvalueistransmittedasrstmeasuredvalue,SVasseconedmeasuredvalue.
Information:
The max. value for the PV to be transmitted is 999.99 inches (cor-
responds to approx. 25.4 m).
If the temperature should be transmitted in the Levelmaster protocol, then TV must be set in the
sensor to temperature.
PV, SV and TV can be adjusted via the sensor DTM.
Report Unit Number
Parameter Length Code/Data
Request: Report Unit Number 5 characters ASCII U**N?
Response: Report Level (and Temperature) 6 characters ASCII UuuNnn
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