Mikroelektronika MIKROE-350 Fiche De Données

331

- SOFTWARE AND HARDWARE SOLUTIONS FOR EMBEDDED WORLD

CHAPTER 6

sub procedure RS485Slave_Receive(dim byref data_buffer as
byte[20])

Nothing.

Receives messages from Master. If Slave address and Message address field
don't match then the message will be discarded. Messages are multi-byte, so
this routine must be called for each byte received. 

Parameters : 

- 

data_buffer:

6 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 

The function automatically adjusts 

data[4]

and 

data[5]

upon every received

message. These flags need to be cleared by software.

MCU must be initialized as a Slave for RS-485 communication. See
RS485Slave_Init.

dim msg as byte[5]
...
RS485Slave_Read(msg)