407764 Datasheet, PDF (12/12 Pages) Extech Instruments Corporation. – Datalogging Sound Level Meter

Software Protocol
Data Protocol Baud rate: 9600bps
Byte1
Byte2
Byte3
Byte4
02
Status
Function
Leading byte
Status Byte2
Bit7 Bit6 Bit5
Bit4
Bit3 Bit2 Bit1
0 Fast C Normal Normal Normal 0
0
1 Slow A
Max
Full
Rec
0
0
0
1
0
1
1
0
1
0
1
1
1
1
Byte5
03
Ending byte
Bit0
0
30-80
1
40-90
0
50-100
1
60-110
0
70-120
1
80-130
0
30-130
1
Function Byte3
Bit7
0
Normal
1
OVER
Function Byte4
0
1
Bit6
Normal
UNDER
Bit5
Normal
BT
Bit4 (x10²)
Bit3-0 (x10)
00-19
Bit7-4 (x 10⁰)
00-99
Bit3-0 (x10^-1)
Command Protocol
Set time and date - Send 7 bytes
D
YY
MM
dd
hh
mm
ss
leading byte year
month
date
hour
min
sec
Set sampling rate – Send 3 bytes
W
high byte
low byte
leading byte
1 – 65535 sec
Set ID code – Send 3 bytes
X
high byte
low byte
leading byte
1 – 65535
Get software version – Output “V” - Receive 1 byte (0 – 255)
Get system argument – Output “Y” – Receive 10 bytes
ID Code
Version ID code Data sets
Last address
Sample rate
2bytes
1 byte
1 byte
1 byte
3 bytes
2 bytes
Get time and date – Output “C” - Receive 6 bytes (YY+MM+dd+hh+mm+ss)
Receive 6 bytes (Sets+YY+MM+dd+hh+mm+ss+Status+Sample rate+Records)
Get Record – Output “K”+N records”
Receive (YY+MM+dd+hh+mm+ss+Status+Sampling rate+Records+1^st record+2^nd
record+…+nth record)
Erase Command: “EEE” (3 bytes)
Switch Fast/Slow: “F” (1 byte)
Switch A/C: “A” (1 byte)
Switch range: “U” (up), “P” (down) (1 byte)
Set MAX spl; “M” (1 byte)
Stop Recording: “T” (1 byte)
Start Recording: “S” (1 byte)
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Model 407764 Version 2.1 9/07