Center 305 - Digital Output and RS232 Commands; Digital Output Interface; RS232 Command List

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 .