Data Sheet

300,301,302,303-Rs232 protocol
Baudrate : 9600
Parity: none
Data bits : 8
Stop bits : 1
Command list:
RS232 function note
K(ASC 4BH) Ask for model No.
Return 4 bytes
H(ASC 48H)
Simulate Hold button
Simulate HOLD button
T(ASC 54H) 301,303:T1/T2/T1-T2(TIMER)
300,302:TIMER
Simulate T1/T2/T1-T2 button(301,303) or
TIMER(300,302)button
M(ASC 4DH) Simulate AVG/MAX/MIN Simulate AVG/MAX/MINbutton
N(ASC 4EH) Simulate canceling AVG/MAX/MIN Simulate hold AVG/MAX/MIN button for 2
seconds
R(ASC 52H) Simulate REL button Simulate RELbutton
C(ASC 43H) Simulate C/F button Simulate C/F
A(ASC 41H)
Ask for LCD reading
See below
explanation:
Command K:Return 4 bytes. For example, when sends command "K" to 300, then it
will return "3","0","0",ASCII(13).
Command A(301,303):
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 K/J MAX/AVG/MIN
bit 2 bit 1 bit0
0 0 0 ->normal mode
0 0 1 ->MAXIMUN mode
0 1 0 ->MINIMUN mode
1 0 0 ->AVG mode
1 1 1 -> calculate MAX/MIN/AVG in background and lcd "MAX""AVG""MIN"
will flash.
bit3:1->0->K TYPE 1->J TYPE(301 only has K type)
bit4:1->REL