Hello wieczus,
No, not use pullup, only this on start of the code
Config Com1 = 38400 , Synchrone = 0 , Parity = None , Stopbits = 1 , Databits = 8 , Clockpol = 0
Open "Com1:" For Binary As #1 'RS485 trough Uart0
Config Serialin = Buffered , Size = 250
Enable Interrupts
Best regards
toto
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