Data Sheet
304,309 PROTOCOL OF SERIAL INTERFACE
Baudrate : 9600
Parity: none
Data bits : 8
Stop bits : 1
Command A(304):
1
nd
The first byte is the start byte , it value is 2.
BYTE:
2
nd
bit7
BYTE:
bit6
bit5
bit4
Bit3
bit2
bit1
bit0
C/F
Low Bat
Hold
REL
T1-T2
MAX/MIN
Recording
bit0: 1->now is recording , 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 and lcd "MAX""MIN" will flash.
bit3 1 ->LCD now is displaying T1-T2 .
bit4:1->REL
bit5:1- HOLD 0->not HOLD
bit6:1->LOW BATTERY 0->BATTERY NORMAL
bit7:1->C 0->F
3
nd
bit7
BYTE:
bit6
bit5
bit4
bit3
bit2
bit1
bit0
Auto Off
MemFull
Bit7:1->Auto power off enabled.
4
nd
5
BYTE:T1_State db ? ;
nd
6
BYTE:T2_state db ? ;
nd
7
BYTE:T3_state db ? ;
nd
BYTE:T4_state db ? ;
8
nd
BYTE and 9
nd
For example: 8
BYTE:
nd
and 9
nd
10
byte are 0x01 0x02 then channel 1 will be 0x0102 that is 258 in decimal ,
then divided by 10 , that is 25.8 degree
nd
BYTE and 11
nd
BYTE:


