Hardware handshaking prevents a data source from sending data when the SDR2-USB is not ready to receive it – the SDR2-USB can “shut off” the transmitting data source if, for example, the USB storage media is slow or not present.
Be sure that your serial data source and the SDR2-USB use the same handshaking settings. If your data source monitors the handshaking signals but the SDR2-USB doesn't send the appropriate signal, the software may never transmit data.
To change the baud rate for the data port, add the line DataPortBaud= to the setup file as in Figure 1.4. Common baud rates are 300, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200, 230400 bps, although the SDR2-USB can handle “nonstandard” baud rates as well.
To enable hardware handshaking, include the line DataPortHandshake= in in the file, with a value of 1 for enabled or 0 for disabled.
Finally, while 8N1 communication is used by the vast majority of data sources, some devices communicate using nonstandard data word formats such as 7E1. To specify this, add the line DataPortWordFormat= to the setup file, with a value of 8N1, 7E1, etc.
2.4 Specifying a filename and folder
By default, the SDR2-USB records data to a file called SDR-0000.DATlocated in the DATA subfolder in the storage device's root directory. You can keep this filename or specify a new filename that reflects the data it contains. For example, you may wish to use PRESSURE.TXT for pressure data or a name like TEMP1109.TXT for temperature data from November 2009. Likewise, your choice of folder names may reflect something about the data it contains.
Notes about filenames
When you specify a filename, it must conform to the FAT 8+3 filename format. This means that files contain up to 8 characters, a period ("dot"), and up to three more characters. For example, BRIDGE.DAT, ABCDEFGH.123, and 1 are all valid filenames, while DATA.FILE, and JOHNSMITH.TXT are not. The SDR2-USB ignores characters you type that are not allowed in FAT16 filenames, such as: \/*[]. Specifying illegal characters can sometimes result in unpredictable filenames.
To specify the name of the file the SDR2-USB will use for recording data, include the line Filename= in your setup file and specify a folder and filename after the equals sign. For example, to record to a folder named “GPSDATA” and use a filename of “GPS-0000.TXT”, include the line Filename=GPSDATA\GPS-0000.TXT (see Figure 2.3).
