DECTST—Invoke Confidence Test
Select tests to be performed.
is the parameter indicating a test to be done.
|0||"All Tests" (1,2,3,6)|
|1||Power-Up Self Test|
|2||RS-232 Port Data Loopback Test|
|3||Printer Port Loopback Test|
|4||Speed Select and Speed Indicator Test|
|5||Reserved - No action|
|6||RS-232 Port Modem Control Line Loopback Test|
|7||EIA-423 Port Loopback Test|
|8||Parallel Port Loopback Test|
|9||Repeat (Loop On) Other Tests In Parameter String|
After the first parameter, "4", the parameters each select one test. Several tests may be invoked at once by chaining the parameters together separated by semicolons. The tests are not necessarily executed in the order in which they are entered in the parameter string.
"ESC # 8" invokes the Screen Alignment test for the VT510. Additionally, after executing the power-up selftest, the terminal displays either the diagnostic messages in the upper left corner of the screen or the "VT510 OK" message in the center of the screen and within a box. Upon receipt of any character except XON or if the user types a keystroke, the screen is cleared. If the terminal is in local mode, then characters from the host are ignored and the message remains visible even if characters are received from the host. DECTST causes a disconnect; therefore, it should not be used in conjunction with a modem.