RTS flow control on Spider II X4

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I am using the K socket X4 on a Spider II with the following code :

serial = new SerialPort(FEZSpiderII.Socket4.SerialPortName, 19200, Parity.None, 8, StopBits.One);
this.serial.Handshake = Handshake.RequestToSend;
this.serial.Open();

On the ‘open’ call, I get an InvalidOperationException in HandlePinReservations, and yet this error occurs even if this is the only device I initialize. I am working with the Gadgeteer Cellular Radio. With RequestToSend, handshake, I get the exception. Without it, the Open succeeds, but I get no RS232 bytes received.

Is this a known issue? Is there a workaround?

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Thanks Andre - didn’t see that in my first search.