Voltcraft SL-451 Sound Level Meter and Data Logger 31.5 Hz – 8 kHz SL-451 Hoja De Datos
Los códigos de productos
SL-451
interface protocol
Interface protocol modification
9600 bit, with start and stop bit, 8 bit transmitting, without parity check.
The communication protocol from SCM to PC
Protocol 1.: data transmitting protocol
Identification
code
data
hex BCD
code
A5 0D
A5 06
The first byte fixed at A5, which is data identification code.
The following is BCD code for 2 byte(data display) or 3 byte(time).
Time style 0A5H + 06H + 3 byte data
2 kinds of data style Renovating data style ---0A5H + 0DH + 2 byte data + A5H
+ 0BH
Renovating bargraph style ---0A5H + 0DH +
2 byte data + A5H + 0CH
The indicated bargraph segments are calculated according to 2 byte data and current
range.( the last bit of BCD is decimal fraction).
Command and function
hex
indicator Data
range
Available
reading
A5H
1BH
dBA
0-130.0 dB
0.1 dB
A5H
1CH
dBC
0-130.0 dB
0.1 dB
dBA / dBC only one can be
displayed
A5H 02H
FAST
A5H 03H
SLOW
FAST/SLOW only one can be displayed
A5H 04H
MAX
A5H 05H
MIN
MAX/MIN only one can be displayed or non of them
displayed
A5H 06H
TIME
1:00:00—12:59:59 Display and renovating time, date,
year, month etc.
A5H
07H
OVER
Display OVER bargraph and current measured readings
A5H 08H
UNDER
A5H
0ffH
hold
PC only receive command but not display HOLD symbol
A5H
0AH
REC
Automatically Saving function A5H 1AH cancel REC
A5H
0BH
Display renovating data and bargraph
A5H
0CH
Display renovating bargraph but not data
A5H
0DH
Display measured readings with decimal all the time.
A5H 0EH
CANCEL
MAX/MIN
A5
11H
CANCEL OVER& UNDER