LG Electronics 120S user manual 3041 5272 5354 31313332

Chapter 8 Communication Functions

(4) Response Format ( NAK response)

Format name

Header

Station No.

Command

Command type

Error code

Tail

Frame check

(Hex 2 Byte)

Frame (Example)

NAK

H0A

R(r)

ST

H1132

ETX

BCC

ASCII value

15

3041

5272

5354

31313332

03

*When command is one of lower case(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, and sent.

*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 that the status of MASTER-K120S Main unit of station No. 1 is read.

①Computer request Format (PC → MASTER-K120S Main Unit)

Format name	Header	Station No.	Command	Command type	Tail	Frame check
Frame (Example)	ENQ	H01	R(r)	ST	EOT	BCC
ASCII value	H05	H3031	H52(72)	H5354	H04

②For ACK response after execution of command (PC ← MASTER-K120S Main Unit)

Format name	Header	Station No.	Command	Command type	Status data	Tail	Frame check
Frame (Example)	ACK	H01	R(r)	ST	See status data	ETX	BCC
					Format
ASCII value	H06	H3031	H52(72)	H5354		H03

③ For NAK response after execution of command (PC ← MASTER-K120S Main Unit)

Format name	Header	Station No.	Command	Command type
Frame (Example)	NAK	H01	R(r)	ST
ASCII value	H15	H3031	H52(72)	H5354

Error code

Error code (2)

Error code (4)

Tail	Frame check
ETX	BCC
H03

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