Register 20 and 21 general format (Mass stabilization enable and disable).
<STX>atrr:d<ETX>cc
<STX> = ASCII start of text character (02 Hex)
a = Level Plus communication address
t = tank number
rr = register number
: = ASCII colon field delimiter (3A Hex)
d = data (fixed at 1 data field of 1 character)
<ETX> = ASCII end of text character (03 Hex)
cc = optional 2 byte checksum (if enabled)
The value of the 1 data character indicates if the mass stabilization command action was
completed. An ASCII "0" indicates that the requested action was not completed and an
ASCII "1" indicates that the requested action was completed.
Register 30 general format (Read VCF mode)
<STX>attr:d<ETX>cc
<STX> = ASCII start of text character (02 Hex)
a = Level Plus communication address
t = tank number
rr = register number
: = ASCII colon field delimiter (3A Hex)
d = data (fixed at 1 field of 1 character)
d = 0 = volumetric function disabled
d = 1 = table 6A
d = 2 = table 6B
d = 3 = table 6C
d = 4 = table 6C MOD
d = 5 = CUST TAB
<ETX> = ASCII end of text character (03 Hex)
cc = optional 2 byte checksum (if enabled)
Register 31 general format (Read API gravity)
<STX>attr:ddd.d<ETX>cc
<STX> = ASCII start of text character (02 Hex)
a = Level Plus communication address
t = tank number
rr = register number
: = ASCII colon field delimiter (3A Hex)
ddd.d = data (where ddd.d is a variable length field with 1 to 3 characters to the
left of the decimal point and 1 character to the right of the decimal point)
<ETX> = ASCII end of text character (03 Hex)
cc = optional 2 byte checksum (if enabled)
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