MikroElektronika PIC Microcontrollers PIC16 Fiche technique télécharger pdf (Page 133)

Programming PIC Microcontrollers in BASIC - mikroElektronika

Description Only messages that appropriately address Slaves will be received. 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

● rest of the buffer is undefined

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

repeatedly from the program.

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

Example

RS485Slave_Read(dat)

5.2.14.6 RS485Slave_Write – Sends message to Master

Prototype

sub procedure RS485Slave_Write(dim byref data as byte[2], dim datalen as

byte)

http://www.mikroelektronika.co.yu/english/product/books/picbasicbook/05.htm (91 sur 112)05/11/2004 02:20:55

1 2 ... 128 129 130 131 132 133 134 135 136 137 138 ... 193 194

Pas de commentaire

MikroElektronika PIC Microcontrollers PIC16 Fiche technique Page 133