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Programming PIC Microcontrollers in BASIC - mikroElektronika

Prototype sub procedure RS485master_read(dim byref data as byte[5])

Description Master receives any message sent by Slaves. As messages are multi-byte, this procedure 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 actual data

● data[3] is number of 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

Procedure automatically sets data[4] and data[5] upon every received message. These flags need to be cleared

repeatedly from the program.

Note: MCU must be initialized as Master in 485 communication to assign an address to MCU

Example

RS485Master_Read(dat)

5.2.14.3 RS485Master_Write – Sends message to Slave

Prototype

sub procedure RS485Master_Write(dim byref data as byte[2], dim datalen as

byte, dim address as byte)

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MikroElektronika PIC Microcontrollers PIC16 Ficha de datos Pagina 131