9-Bit Send/Receive

[andymuller]

Hello everyone,

In brief, I would like to send/receive 9600,8,O,1. (RS485) by using 16F876A like this format:

Address, command1, command2, command3 ,checksum.

I start my work first for sending and now I am still involved at sending-section. I use these below settings:

And the problem is:
It always sends the first byte correctly, after that, the second and third is not the case which I respect. Depends on case 7^th bit is one “1” and changes commands and checksum. seems they sum by 80 Hex.

Any suggestion, please? Or a sample routine which has been already tested for 9600,8,O,1.

ManyThanks in advance.

; With 4Mhz Osc
DEFINE HSER_BAUD 9600
DEFINE HSER_BITS 9   
DEFINE HSER_ODD 1        'Set ODD Parity
DEFINE HSER_SPBRG 25 
DEFINE HSER_CLROERR 1
TRISB=$FF
TRISC=0
Address VAR BYTE
Command1 VAR BYTE
Command2 VAR BYTE
Command3 VAR BYTE
Checksum VAR BYTE
Address = $40
Command1 = $50
Command2 = $44 
Command3 = $A5
Checksum =  Address ^  Command1 ^ Command2 ^ Command3
while (PORTB.0 = 1)
HSEROUT [ Address ]
pause 1
HSEROUT [ Command1 ]
pause 1
HSEROUT [ Command2 ]
pause 1
HSEROUT [ Command3 ]
pause 1
HSEROUT [ Checksum ]
PAUSE 1
WEND