Mikroelektronika MIKROE-742 데이터 시트

341

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

procedure RS485Master_Receive(var data_buffer: array[5] of byte);

Nothing.

Receives messages from Slaves. Messages are multi-byte, so this routine must
be called for each byte received. 

Parameters : 

- 

data_buffer

: 7 byte buffer for storing received data, in the following manner: 

- 

data[0..2]

: message content 

- 

data[3]

: number of message bytes received, 1–3 

- 

data[4]

: is set to 255 when message is received 

- 

data[5]

: is set to 255 if error has occurred 

- 

data[6]

: address of the Slave which sent the message 

The function automatically adjusts data[4] and data[5] upon every received mes-
sage. These flags need to be cleared by software.

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

var msg : array[20] of byte;
...
RS485Master_Receive(msg);