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Message: [QUOTE="Guest, post: 7530554"] Hi all,I am running the OpenNETCF.Serial.IO library under WinCE 5.0 device. I am able to connect to my embedded modem (COM4) successfully via Hyperterminal and successfully issue AT command in hyperterminal. However, when I try to run on the sample app built by me , which is using the mentioned library, whenever I try to issue an AT command, I will receive Framing error. Anybody can help me solve this? Here is the port settings: Port Name: COM4: BaudRate: 115200 Byte Size: 8 Parity: None StopBits: One The application works fine in another WinCE device(WinCE 4.2) which have the following configuration: Port Name: COM3: BaudRate: 9600 Byte Size: 8 Parity: None StopBits: One I also downloaded the sample app from [URL]http://msdn.microsoft.com/mobility/default.aspx?pull=/library/en-us/dnnetcomp/html/PISAPICF.asp[/URL] and try to run it on Win5.0 device, also fail (but pass on WinCE 4.2 device).Any Clue? [/QUOTE]