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Article #4554

Serial comm problem

#4554
From: Bogdan
Date: Sun, 08 Jan 2006 18:23
38 lines
2216 bytes
Hello,

I'm trying to communicate between 2 PCs using a serial cable(null modem).
I've written a dll where I export  the functions I need to initialize, 
read/write and
shutdown a serial port.The problem is that I only tested it on a single PC, 
by
connecting a cable between the 2 COM ports.When i tried the app between 2
different PC-s it didn' t work anymore.
 I suspect I do something wrong with the DCB structure used to set up the 
port, but
i don't know what.This is the code used to init the DCB :

ZeroMemory(&PortDCB,sizeof(DCB));
PortDCB.DCBlength = sizeof(DCB);

GetCommState(COMPort,&PortDCB);

PortDCB.fOutxCtsFlow      = FALSE;
PortDCB.fOutxDsrFlow      = FALSE;
PortDCB.fDtrControl       = DTR_CONTROL_DISABLE;
PortDCB.fRtsControl       = RTS_CONTROL_DISABLE;
PortDCB.fOutX             = TRUE;//FALSE;
PortDCB.fInX              = TRUE;//FALSE;
//PortDCB.fDsrSensitivity   = FALSE;
//PortDCB.fTXContinueOnXoff = TRUE;
//PortDCB.fErrorChar        = FALSE;
//PortDCB.fNull             = FALSE;
//PortDCB.fAbortOnError     = FALSE;

PortDCB.BaudRate = Speed;
PortDCB.fBinary  = TRUE;
PortDCB.fParity  = TRUE;
PortDCB.ByteSize = 8;
PortDCB.Parity   = NOPARITY;
PortDCB.StopBits = ONESTOPBIT;

Bogdan 
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From: "Bogdan" <boprea@xnet.ro>
Newsgroups: borland.public.cppbuilder.nativeapi
Subject: Serial comm problem
Date: Sun, 8 Jan 2006 20:23:59 +0200
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