# Test Preferences – Serial ports

(Applicable to BurnInTest Pro version only)

Adding a serial port

To select a serial port for testing, select the COM port number from the right hand drop down list, select the test type, then click on the add button. Up to 64 ports can be selected for simultaneous testing.

Removing a serial port

To remove one or more a serial ports, select the COM port(s) from the left hand list then click on the remove button.

Serial port drop down list

The communications ports that will be used by the serial port test, e.g. COM1.

Test type

For each serial port it is possible t select either a “Detect and loopback test” or a “Detect only” test. The, Detect and loopback test, requires the use of serial port loopback plugs. The Detect only test does not require a loopback plug. When possible use the loopback test as it is a more though test.

Send and Receive timeouts

This is the amount of time in milliseconds that BurnInTest will wait for the successful completion of a Serial I/O operation.

Disable RTS/ CTS and DSR / DTR test phase

The checkbox will disable the part of the serial port that checks that the signal pins are functioning correction.

RTS = Request to send pin

CTS = Clear to send pin

DSR = Data set ready pin

DTR = Data Terminal ready pin

This can be useful to avoid errors when testing non-standard serial ports.

Use RTS/ CTS flow control during loopback

This checkbox will enable the use of RTS/CTS flow control. When this is enabled, data will not be transmitted until the receive side (of the loopback) is ready. This should prevent 16550 UART FIFO data overrun errors.

Port speed

The communications speed or the cycling through the different speeds can be selected. Note that most serial ports do not support speeds above 115200bits/sec.

See also

See the serial port test for more details.