Fluke 5520A - Testing RS-232 UUT Port Operation Using Visual Basic

Remote Operation
Setting up the RS-232 UUT Port for Remote Control 5
5-19
The characters UUT_SEND “<uut command>“ should have appeared as they were
entered. If they did not appear on the screen, the RS-232 interface between the PC
and 5520A Host port is not operating. Review the “RS-232 Host Port Setup
Procedure” and correct the problem.
4. If the UUT command does not execute, refer to step 3 of the “RS-232 UUT Port
Setup Procedure” procedure to verify the RS-232 UUT port parameters. Also check
the cable for UUT connection was a modem (not null modem) cable. Be sure your
command was entered correctly had the proper end-of-line character(s), if required.
5. When finished testing UUT commands, select the Exit command from the File menu
to close the Terminal accessory.
5-14. Testing RS-232 UUT Port Operation using Visual Basic
Complete the following procedure to test RS-232 UUT port operation via the RS-232
Host port using a Visual Basic test program. This procedure assumes you have already
completed Appendix D, “Creating a Visual Basic Test Program” to create the program
used for this test.
Complete the following procedure to test RS-232 operation using Visual Basic.
1. Complete the “RS-232 UUT Port Setup Procedure” earlier in this chapter to set up
the 5520A RS-232 UUT port to match the parameters of the UUT RS-232 port.
2. Complete “Testing RS-232 Host Port Operation using Visual Basic” to prepare the
Calibrator RS-232 Host port. After Step 6, return to this procedure and continue to
Step 3 below.
3. Click the Command3 button (below is typical). Observe the UUT responds to the
command you used when you completed Appendix D, “Creating a Visual Basic Test
Program.”
nn311f.bmp
If the UUT did not respond, check the RS-232 parameters set for the Calibrator UUT
port and set for the UUT port. Verify you used a modem (not null modem) cable for
the 5520A to UUT connection. Check the Visual Basic program to make sure the
UUT command was entered correctly, including the end-of-line character, if any.
4. Close the program by clicking the top-left corner and Close.