Datasheet

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