Function Code 01 : Read Coil

This Function Code reads the state of 1 or more bits. The example below reads coils 1 ~ 8.

Query:

Field Data Number of Bytes
Slave Address 0x03 1
Function Code 0x01 1
Start Address HI 0x00 1
Start Address LO 0x00 1
Length HI 0x00 1
Length LO 0x08 1
Error Check CRC 2

Response:

Field Data Number of Bytes
Slave Address 0x03 1
Function Code 0x01 1
Byte Count 0x01 1
Data 0x53 1
Error Check CRC 2

비트정보 8 개를 읽어서 한 개의 바이트로 구성한 다음 반환해줍니다..