Description: To initiate a Dataloop with Selftest SET this object and specifiy a blocksize. The nms520 (the remote) unit will go into Dataloop and the master (the sc5520) unit will go into Selftest. The blocksize indicates the number of blocks the Selftest pattern generator will run. There are 1000 bits/block. Emuns 3 through 10 are write only. The only valid responses to a READ are dataloopOn(2) or dataloopOff(1). This test will terminate after the specified number of blocks have been run. Reading test results via the nms520DiagBitErrors or nms520DiagBlockErrors objects while the test is running will cause the test to terminate prematurely and render the results invalid. Test results should be read only after the test is completed and are available from the master (sc5520) unit. The current Test Status can be obtained by reading the sc5520DiagTestStatus object on the master unit, reading test status on the remote unit may interfere with the diagonostic test pattern and cause errors. This test can also be terminated by seting the nms520DiagTestReset object.