Simply click Start → Programs → LayGO PXS Toolkit → WinTdrv - Loop.

(For a detailed explanation of the WinTdrv program, see Testing with tdrv in the LayGO Installation Guide.) You will see the following window:

The top left dialog shows that the program will use line 0, which corresponds to synchronous port 0 on the PXS (later you will use the drop down list to change it to line 1, corresponding to the synchronous port 1 on the PXS).

Now, do the following:

• Click on the Open button to execute a lgo_Open() call to line 0. The State display on the upper right corner should change to Open and the Open button will become grayed out. The Session Log will show Line 0 open - CID = 0.
• Click on the Connect button to execute a lgo_Connect() call on line 0. The line is configured to internal loopback, so the transmitter is connected to the receiver. The connect call will be successful, the State display on the upper right corner should change to Data Transfer state - XON and the Connect button will become grayed out. The Session Log will show Event received: Connected. The Flags signal light will turn green indicating that the receiver sees flags (x7E) on the line. The program will read any data received and will log any event.
• Click on the Send button, to execute a lgo_Write call on line 0. As the line is configured to internal loopback, the same data will be read. In the Session Log you will see:

  > 0128 [0x0000]: Good
  F0 07 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E # ..ABCDEFGHIJKLMN
  

  (If you press the Send button repeatedly, a frame will be transmitted with every click.)

• Press the Full Duplex button. This will send data continuously through the transmitter, until the same button is clicked again.
• Click Disconnect and then Close.
• You should repeat the same procedure using line 1.

If you have any trouble during this procedure, check the Troubleshooting section.

This test verifies that the PXS line drivers and receivers are correct, as well as the interface cable.

Connect the synchronous interface cable to the PXS. Connect the appropriate loopback plug to the connector. (The LayGO Hardware Guide has detailed diagrams of loopback plugs.)

Now click Start → Programs → LayGO PXS Toolkit → WinTdrv - Source

Repeat the same procedure indicated above, for Internal Loopback. The test is similar but now data is going out through the cable and back from the loopback plug to the PXS. If this test works correctly, the cable and the line drivers and receivers are OK.

This test should be run only if the internal loopback test ran successfully. It can only be run on a PXS with 2 lines.

Setup

Connect the PXS's 2 synchronous ports in a back-to-back fashion: Use a DB-26 to DB-25 straight cable (P/N CBL-PXS-26/25-1) connected to each port and an RS-422/EIA-530 null modem cable. (See the Null Modem Cables section of the LayGO Hardware Guide.) Alternatively, you may interconnect the 2 ports using a "crossover cable" (P/N CBL-PXS-XOVER).

Test

Now, you will use two instances of WinTdrv program. One will drive port 0 (which will be configured as clock source) and the other port 1 (which will be configured as clock sink).

Start the first instance by clicking Start → Programs → LayGO PXS Toolkit → WinTdrv - Source. Start the second instance with Start → Programs → LayGO PXS Toolkit → WinTdrv - Sink.

In the last wintdrv, change the line in the upper left corner drop down list to 1.

Now do the following:

• Click on the Open button on line 0. The Session Log shows Line 0 open - CID = 0. Click also the Open button in the line 1 window. There, the Session Log shows Line 1 open - CID = 1.
• On line 0 window, click on the Connect button:
  • The State display in the upper right corner will change to Waiting for Remote Connect Accept.
  • The DTR and RTS (output) signals will rise (indicated by the signal lights turning green).
  • The DSR and CTS (input) signal lights will turn red, because they are low.
  • The Flags signal light will turn red indicating there are not flags received yet.
• On line 1 window, click on the Connect or the Listen button:
  • The State display on the upper right corner on both windows will change to Data Transfer State - XON.
  • The DTR and RTS (output) signals will be raised (indicated by the signal lights turning green).
  • The DSR and CTS (input) signal lights will turn green (they are connected to DTR and RTS respectively, from line 0, which are actually high from the previous step). Also, on Line 0 the DSR and CTS signal lights will turn green.
  • The Flags signal light will turn green on both lines, indicating there are flags on the receiver.
  • The Status Log will show Event Connected on both windows.
• Click on the Send button on line 0. As the line 0 transmitter is connected to line 1 receiver, you must see on the Session Log of line 1 the data received:

  > 0128 [0x0000]: Good
  F0 07 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E # ..ABCDEFGHIJKLMN
  

• Now, click on the Send button on Line 1. You see the received data on Line 0.
• If you want, press the Full Duplex button on both windows. Both sides should now receive data continuously. Stop by clicking the Full Duplex again
• Click Disconnect, Close and close the program window on both sides.