USB to Serial_Manual_Eng_DM v3.05.1

USB to Serial User Maual
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2. This page allows configuration of the basic device parameters (i.e. Baud rate, data bits, parity, stop bits and flow
control). To access more advanced settings, click on the "Advanced…" button to display the advanced
properties page. (shown below)
3. This page will allow the following parameters to be altered:
COM port number: You can change the serial port number.
- USB buffer sizes: Select maximum size of send or receive data
- Latency timer: Alter this to correct compatibility problems for obsolete applications.
- Read and write timeout values
You can alter this for timing of timeout event if there are no more Tx/Rx data.
- Serial Emulator: The function of the serial enumerator is to detect a Plug-and-Play enabled device (such as
a serial mouse or serial modem) that is attached to the USB serial port.
- Serial Printer: If enabled, serial printer will disable timeouts to allow for long delays associated with paper
loading.
- Cancel If Power Off: The Cancel If Power Off option can be used to assist with problems encountered when
going into a hibernate or suspend condition. This will cancel any requests received by the driver when
going into hibernate or suspend.
- Event on Surprise Removal: The Event On Surprise Removal option is generally left unselected. If an
application sets SERIAL_EV_EVENT2 (refer Windows DDK) in it is event bitmask and this feature is enabled,
the device driver will signal this event on surprise removal.
- Set RTS on Close: Selecting the Set RTS on Close option will set the RTS signal on closing the port.
- Disable Modem Control at Startup: This option is used to control the modem control signals DTR and RTS
at startup. In normal operation, the modem control signals at startup follow the behavior of the legacy port.
However, due to timing differences between a legacy COM port and a virtual COM port, a "spike" on one of
these signals in the legacy port can appear as an assertion of the signal in the virtual COM port.