Data Logger
Instruction Manual
5
TX
RX
GND
4.13 Digital Output:
The Digital Output is a 9600bps N 81 serial interface.
The RX is a 5V normal high input port.
The TX is a 5V normal high output port.
The command of Digital Output is list below:
RS232 command
Function
Remarks
K(ASC 4BH)
Ask for model No.
Return 4 bytes
A(ASC 41H)
Inquire all encoded data
Return encoded 10 byte
H(ASC 48H)
Hold button
M(ASC 4DH)
MAX/MIN button
N(ASC 4EH)
Exit MAX/MIN mode
R(ASC 52H)
REL button
C(ASC 43H)
C/F button
U(ASC 55H)
Dump all memory of thermometer
return 32768 bytes
P(ASC 50H)
Load recorded data
•
Command K:
Return 4 bytes. For example, when sends command "K" to meter, it will return "3","0","5",
ASCII(13) .
•
Command U:
Return 32768 bytes .
•
Command P:
Instead of returning all 32768 bytes, it only return recorded data .
•
Command H:
Equivalent to one pushing on the HOLD button and no message is returned.
•
Command M:
Equivalent to one pushing on the MAX/MIN button and no message is returned.
•
Command N:
Equivalent to one pushing and hold the MAX/MIN button for two seconds to exit MAX/MIN mode.
•
Command R:
Equivalent to one pushing on the REL button and no message is returned.
•
Command C:
Equivalent to one pushing on the °C/°F button and no message is returned.
•
Command A:
1
nd
BYTE:
The first byte is the start byte , it value is 2.
2
nd
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1
bit0
C/F Low
Bat Hold REL
MAX/MIN REC
bit 0:
1
→
recording mode, 0
→
not recording
bit 2 bit 1
0 0
→
normal mode
0 1
→
MAXIMUN mode
1 0
→
MINIMUN mode
1 1
→
calculate MAX/MIN in background mode .
