LG Electronics 120S user manual Wordw

Chapter 8 Communication Functions

(3) MASTER-K120S Main unit response format (MASTER-K120S of ACK response)

Format name	Header	Station No.	Command	Command	Number of	Number of	data	Tail	Frame
				type	blocks	data			check
Ex. of frame	ACK	H10	R(r)	SB	H01	H02	H1122	EOT	BCC
ASCII value	H06	H3130	H52(72)	H5342	H3031	H3134	H31313232	H03

Item			Explanation
	When command is lowercase(r), only one lower byte of the value resulted by adding 1 Byte
BCC	each to ASCII values from ACK to ETX is converted into ASCII and added to BCC, and
	sent.
	It means byte number of hex type, and is converted into ASCII. This number is determined
	by multiplying the data number of computer request Format by the data size(in below
	table) according to memory type(B,W,D) included in variable name of computer request
Number of data	Format.
		Data type	Available device	Data size
		WORD(W)	%(P,M,L,K,F,T,C,D,S)W	2
Data	.In data area, there are the values of hex data converted to ASCII code saved.

Ex.1

When memory type included in variable name of computer request Format is W(Word), and data number of computer request Format is 03, data number of PLC ACK response after execution of command is indicated by H06(2*03 = 06 bytes)Byte and ASCII code value 3036 is entered in data area.

Ex.2

In just above example, when data contents of 3 words are 1234, 5678, and 9ABC in order, actual ASCII code converted values are 31323334 35363738 39414243, and the contents are entered in data area.

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