Software Protocol; Command Protocol - Extech Instruments 407764 User Manual

Software Protocol

Data Protocol
Byte1
02
Leading byte
Status Byte2
Bit7 Bit6
0 Fast C
1 Slow A
Function Byte3
Bit7
0 Normal
1 OVER
Function Byte4
0
1

Command Protocol

Set time and date - Send 7 bytes
D
leading byte
Set sampling rate – Send 3 bytes
W
leading byte
Set ID code – Send 3 bytes
leading byte
Get software version – Output "V" - Receive 1 byte (0 – 255)
Get system argument – Output "Y" – Receive 10 bytes
ID Code Version
2bytes 1 byte
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
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)
Baud rate: 9600bps
Byte2
Status
Bit5 Bit4
Normal Normal
Max Full
Bit6
Normal
UNDER
Bit7-4 (x 10
YY MM
year month
X
ID code
1 byte
Byte3 Byte4
Function
Bit3 Bit2
Normal 0
Rec 0
0
0
1
1
1
1
Bit5
Normal
BT
0
)
00-99
dd
date
high byte
1 – 65535 sec
high byte
Data sets Last address
1 byte
Set MAX spl; "M" (1 byte)
Stop Recording: "T" (1 byte)
Start Recording: "S" (1 byte)
12 Model 407764 Version 1.4 December 2004
Ending byte
Bit1 Bit0
0 0
0 1
1 0
1 1
0 0
0 1
1 0
1 1
2
Bit4 (x10 )
00-19
Bit3-0 (x10
hh mm
hour min
low byte
low byte
1 – 65535
3 bytes
st
record+2
Byte5
03
30-80
40-90
50-100
60-110
70-120
80-130
30-130
Bit3-0 (x10)
-1
)
ss
sec
Sample rate
2 bytes
nd