Hitachi Kokusai Electric KP-F520WCL Operation Manual page 23

(2) Read (receive) data (slave to master)
(a) Command data are converted into ASCII code and transmitted.
(b) Comms byte quantity is 10.
(c) Comms data format (transmission sequence)
S T X
1 byte
・STX (start code)
・Text data
・ETX (end code)
・SUM
(d) Text data details (transmission sequence)
Data
2 byte x 3
6 byte
・Data (note)
Note: Data transfer sequence
Data bytes
1
2
3
5. Calculation method of checksum
Example
1
STX
STATUS ID NO
02 01
1. STAUTUS to DATA are transformed into hexadecimal number on the basis of the ASCII code.
'0'→(30) '1'→(31)
16
2. STX to ETX are added all.
(02) +(30) +(31) +(46) +(46)
16 16 16 16
STX STATUS ID
3. The XOR (Exclusive OR) between the value obtained in 2 clause and (FF)
answer become SUM
(2D7) XOR (FF) = （228）
16 16
Text data
6 byte
: Code indicating start of text.
1 byte (02H)
: Transmit / receive data.
6 byte (ASCII code)
: Code indicating end of text.
1 byte (03H)
: XOR result (FFH), of adding STX, Text data, and ETX.
2 byte (ASCII code)
: Sets Read data to be transmitted.
2 byte x 3 (ASCII code)
1st byte 2nd byte
Data 0x00
Upper Lower
Upper Mid
2 3
AREA ADDRESS
FF 01
'4'→(34) 'F'→(46)
16 16
+(30) +(31) +(30) +(34)
16 16 16 16
AREA RELATIVE
16
E T X
1 byte
10 byte
3rd byte
0x00
0x00
Lower
4 5
RELATIVE NO
04 00
STX: (02) ETX: (03)
16 16
+(30) +(30) +(30) +(30) +(30)
16 16 16 16 16
DATA
16
S U M
2 byte
6 7
ETX
DATA
00 00 03
16
+(30) +(03) ＝(2D7)
16 16 16 16
ETX
are taken, then two column under the
SUM
28
15