Hello,

I have problem with timeout in the "SysComRead" function.

I send the message with COM port successfully and then I want to read the answer, but function "SysComRead" doesn't wait for setting timeout to the answer.

How may I set this communication?

Thank you for your help.

Here is part of my code:

```

Global variables:
   port: PORTS:=COM1;
   setting: COMSETTINGS := (Port:=COM1,
            dwBaudRate:=9600,
            byStopBits:=0,
            byParity:=0,
            dwTimeout:=5000,
            dwBufferSize:=0,
            dwScan:=0);
Function:
   handle: DWORD;
   message: ARRAY [0..9] OF BYTE;
   handle := SysComOpen( port );     ( Open COM port )
   SysComSetSettings(dwHandle:=handle, ComSettings:=ADR(setting));     ( Setting up communication )
   SysComWrite(handle, ADR(message), 7, 5000);     ( Send message (7bytes) )
   SysComRead(handle, ADR(message), 3, 5000);     ( Read answer (3bytes) )
   SysComClose(handle);     ( Close COM port )

```[/code]

Hello,

Here is answer from CoDeSys support:

The timeout is the time a function waits in total till it returns.

If the function is called and no data is available then it returns immediately.

I think you must wait until you call the read function as it seems that it takes some time till data is available.