Information

TX
RX
GND
4.11 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 .
bit3: no use.
bit4: 1→ REL
bit5: 1→ HOLD, 0→ not HOLD
bit6: 1→ LOW BATTERY , 0→ BATTERY NORMAL
bit7: 1→ °C 0→ °F
3
th
BYTE:
bit7 bit6 bit5 bit4 bit3 bit2 bit1 bit0
memory full resolution sign OL
bit0: 1→ main window value is OL, 0→ not OL
bit1: 1→ main window value is minus, 0→ main window value is plus.
bit2: 1→ 4
th
byte and 5
th
byte represent #### , 0→ 4
th
byte and 5
th
byte represent ###.#
bit6: 1→ Memory is full. 0→ Memory is not full.
bit7: 1→ Auto power off enabled. 1→ Auto power off disabled.