LS Industrial Systems MASTER-K80S, Руководство пользователя

Страница: 154 / 251

Chapter8 Communication Function
8-11
Ex.2
If number of data is H04 and the data is H12345678, ASCII code converted value of this is "31 32 33 34 35 36 37
38," and this contents is entered in data area. Name directly, highest value is entered first, lowest value last.
Remark
1) If data type is Bit, data read is indicated by bytes of hex. Namely, if Bit value is 0, it indicated by H00, and if
1, by H01.
(4)
Response format (NAK response)
Format name Header Station No. Command Command type
Error code
(Hex 2 Byte)
Tail Frame check
Ex. of frame NAK H20 R(r) SS H1132 ETX BCC
ASCII value H15 H3230 H52(72) H5353 H31313332 H03
Item Explanation
BCC
When command is lowercase(r), only one lower byte of the value resulted by adding 1
Byte each to ASCII values from NAK to ETX is converted into ASCII and added to BCC.
Error code
Hex and 2 bytes(ASCII code, 4 bytes) indicate error type. For the details, see 8.1.8 Error
codes.
(5) Example
This example supposes when 1 WORD from M20 and 1 WORD from P001 address of station No.1 are read and BCC
value is checked. Also it is supposed that H1234 is entered in M20, and data of H5678 is entered in P001.
K80S base unit