Casella CEL CEL-414 - Manual (Page 40)

Where W = Weighting network
selected.
If Ø then = Linear response,
1 then = A-weighting.
The D version format is as follows:
BIT 7 6 5 4 3 2 1 Ø
1 W Ø C F F F F
Where WC = Weighting network
selected.
If ØØ then = Linear + external
filter,
Ø1 then = C-weighting,
1Ø then = A-weighting +
external filter,
11 then = A-weighting.
In all versions, the remaining four bits (F)
indicate the parameter coded as follows:
ØØØØ = Battery level,
ØØØ1 = SPL (or 1SM),
ØØ1Ø = Maximum,
ØØ11 = Duration,
Ø1ØØ = L Tm5 (CEL-493/3 &
B version),
Ø1ØØ = L OSHA (D version),
Ø1Ø1 = L Tm3 (CEL-493/3 &
B version),
Ø1Ø1 = L DOD (D version),
Ø11Ø = SEL,
Ø111 = L eq ,
1ØØØ = General reset during
last 0.5 s.
For example 11ØØØ11Ø indicates A-
weighted SEL value for CEL-493/3 and B
version, or A-weighting plus external fil-
tered SEL value for D version.
Byte 2
This contains encoded details of the
selected time weighting, the status of re-
set, pause, and overload functions, plus
the “hundreds” digits from the results in
ASCII code with the following format:
BIT 7 6 5 4 3 2 1 Ø
Ø T T FR P B V H
Where TT = Time weighting
selected.
If ØØ then = Slow,
Ø1 then = Fast,
1Ø then = Impulse,
11 then = Peak.
Where FR = Reset button.
If: 1 then = Current function
reset during last
0.5 s.
Where P = Pause button.
If: 1 then = Instrument paused.
Where B = Battery condition.
If: 1 then = Battery low.
Where V = Overload function.
If: 1 then = Overload indicated.
Where H = Hundreds digit from
result.
If: Ø then = No hundreds,
1 then = One hundred.
Bytes 3-5
These hold the “tens”, “units”, and
“tenths” digits respectively.
BIT 7 6 5 4 3 2 1 Ø
Ø Ø X X X X X X
Where: XXXXX is an ASCII value in the
range 48-57 corresponding to a decimal
value in the range between 0 and 9.
For example if Byte 3 = ØØ11Ø11Ø,
which corresponds to ASCII 6, the
“tens” digit will be 6.
Page 36 - General CEL Sound Level Meters Handbook