====== Function Code 05 : Write One Coil ======

This Function Code writes a single bit.  0xFF00 sets the coil ON, 0x0000 sets the coil OFF.

Query:

^ Field        ^  Data  ^  Number of Bytes  ^
|Slave Address |0x03 |1|
|Function Code |0x05 |1|
|Start Address HI |0x00 |1|
|Start Address LO |0x01 |1|
|Data HI |0xFF |1|
|Data LO |0x00 |1|
|Error Check |CRC |2|

Response:

^ Field        ^  Data  ^  Number of Bytes  ^
|Slave Address |0x03 |1|
|Function Code |0x05 |1|
|Start Address HI |0x00 |1|
|Start Address LO |0x01 |1|
|Data HI |0xFF |1|
|Data LO |0x00 |1|
|Error Check |CRC |2 |