How to control multiple relays to output different switch states with one command

When one command controls the action of multiple relay output channels:

1. Use to write multiple coil registers function code: 15 function code (hexadecimal: 0f);

2. The relay channel of control output must be continuous without interval;

3. The status of each relay output channel can be set differently.

Instruction (hexadecimal) details:

Specific control instructions:

The coil register uses binary 1 and 0 states to represent the output state of the specific relay. Write 1 to represent the on of the relay and write 0 to represent the off of the relay, with one byte per 8 channels.

give an example:

① In the 16 channel relay output command, 1, 3, 5, 8, 10 and 12 are disconnected and others are on. The specific calculation process of control command is as follows:

Binary:

Hexadecimal control instruction: 56 (1-8 channels) AF (9-16 channels)

All control commands are as follows:

FE 0F 00 00 00 10 02 56 AF D8 08

② In the output command of channel 10 relay, 2, 4, 6 and 8 are disconnected and others are on. The specific calculation process of control command is as follows:

Binary:

Hexadecimal control instruction: AA (1-8 channels) 03 (9-10 channels)

All control commands are as follows:

FE 0F 00 00 00 0A 02 AA 03 9E 6D