Extech Instruments 407764 User Manual page 12

Software Protocol
Data Protocol Baud rate: 9600bps
Bytei
Byte2
Byte3 Byte4
Bytes
02
Status
Function 03
Leading byte
Ending byte
Bit7 Bite
Bits Bit4
Bits Bit2
Bit1 BitO
0
Fast C
Normal Normal
Normal 0 0
0
30-80
1 Slow
A Max
Full
Rec 0 0
1
40-90
0 1 0
50-100
0
1 1
60-110
1 0 0
70-120
1 0 1
80-130
1
1 0
30-130
1 1 1
Function Byte3
Bit7
Bite Bits
Bit4 (xlO^)
Bit3-0 (xlO)
0
Normal
Normal Normal
00-19
1
OVER
UNDER
BT
Bit7-4(x10") Bit3-0(x10")
0
00-99
1
Command Protocol
1 ^
YY
MM
dd hh mm ss
1 leading byte
year month
date hour
mm
sec
W
hiah bvte low byte
leading byte
1 — essss sec
X
high byte low byte
leading byte
1 - essss
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-thh+mm+ss+Status+Sampling rate+Records+1
record+Z™* 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 spi; "M" (1 byte)
Stop Recording: 'T' (1 byte)
Start Recording: "S" (1 byte)
12
Model 407764 Version 1.3 October 2001