Mikroelektronika MIKROE-742 데이터 시트

342

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

procedure RS485Master_Send(var data_buffer: array[20] of byte;
datalen: byte; slave_address: byte);

Nothing.

Sends message to Slave(s). Message format can be found at the bottom of this
page.

Parameters : 

- 

data_buffer

: data to be sent 

- 

datalen

: number of bytes for transmition. Valid values: 0...3. 

- 

slave_address

: Slave(s) address 

MCU must be initialized as a Master for RS-485 communication. See
RS485Master_Init.

It is the user’s responsibility to ensure (by protocol) that only one device sends
data via 485 bus at a time.

var msg : array[20] of byte;
...

// send 3 bytes of data to Slave with address 0x12
RS485Master_Send(msg, 3, 0x12);