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- C Compiler for Microchip PIC microcontrollers
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Prototype
void RS485Slave_Receive(char *data);
Description Receives message addressed to it. Messages are multi-byte, so this function must be
called for each byte received (see the example at the end of the chapter). Upon receiving
a message, buffer is filled with the following values:
data[0..2] is the message,
data[3] is 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] is the address of the Slave which sent the message.
Function automatically adjusts
data[4] and data[5] upon every received message.
These flags need to be cleared from the program.
Requires MCU must be initialized as Slave in RS-485 communication in order to be assigned an
address. See RS485Slave_Init.
Example
unsigned short msg[8];
...
RS485Slave_Read(msg);
RS485Slave_Receive
Prototype
void RS485Slave_Send(char *data, char datalen);
Description Sends data from buffer to Master via RS-485; datalen is a number of bytes in mes-
sage (1 <= datalen <= 3).
Requires MCU must be initialized as Slave in RS-485 communication in order to be assigned an
address. See
RS485Slave_Init.
It is programmer’s responsibility to ensure (by protocol) that only one device sends data
via 485 bus at a time.
Example
unsigned short msg[8];
...
RS485Slave_Send(msg, 2);
RS485Slave_Send