X K 3 1 9 0－A22
APPENDIX I
Bidirectional communication method:
1. Command format: 02H Adr. Command Nor.V-H Nor.V-L 03H
initial character
communication address
command character
（Nor-Verify code）,H is half higher byte
ASCII code，L is half lower byte ASCII code
terminate character
2. Calculation command character string
1) the communication address 1~24 of the indicator correspond with the capital letter A~Z of in
communication command sending, e.g.:01 is set as the communication address, then Adr.=A in communication
command
2） XOR verify code calculation method
（1）The data will get XOR character Nor.V through “ Adr.^ Command”
（2）Nor.V-H＝XOR character Nor.V “ half higher byte” ＋30H
（3）Nor.V-L＝XOR character Nor.V “ half lower byte” ＋30H
Command mode example:
e.g.: send the zero setting command “ 0（30H）” to the indicator, if the communication address is “ 1” ，
confirm sending the command character string.
The communication address is 1, then the sending communication address command character is “ A
（41H）” ；the XOR character is Nor.V＝41H^30H＝71H，则 Nor.V-H＝7H＋30H＝37H，Nor.V-L＝1H+30H
＝31H at this time; so the final transmitting command character string is: 02H 41H 30H 37H 31H 03H
Zero setting command（30H） “ 0”
Tare command （0x54）“ T”
read Command: (0x52）or（0x72）“ R” or“ r”
3． data returning format
The data will be transmitted out in ASCII code when the instrument is in serial transmitting mode, 9 bytes
(include decimal point) for each data frame. Data transmitting is from lower byte to higher byte.0 is positive sign,
1 is negative sign, “ ＝” as list separator between each data frame, transmitting data content is same with the
displayed content on the screen.
（11）
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