SysComRead timeout

2020-02-27T22:56:50.812000Z

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.

SysComRead timeout

2020-02-27T22:56:49.221000Z

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]

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