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CHAPTER 4: Test Procedures
1. Determine which devices are the first and last devices on the bus. The first
device is the one closest to the NT1. The last device is the one furthest
from the NT1. See Figure 4-8 for an example of proper device termination.
2. Go to the first device on the bus.
3. Put the Test Set in TERMINATED and NORMAL mode.
4. Put circuit in Test Configuration 3.
5. Make sure the Test Set is in REVerse mode; LINE button should be in.
6. Power down the terminal.
7. Put the Test Set in the IMPEDANCE test mode.
8. a. If the Green Test Status light goes on, the terminal is terminated.
Unterminate the terminal by following the instructions in the
terminal’s user manual.
b. If the Rest Test Status light goes on, no change in the termination
is necessary.
9. Go to the next device on the bus. If the terminal is NOT the last device on
the bus, go to step four. Otherwise, continue on to step 10.
10. You should be at the last device on the bus. Repeat steps four through
seven.
11. a. If the Green Test Status light goes on, the terminal is properly
terminated.
b. If the Red Test Status light goes on, the terminal is not terminated.
Terminate the terminal by following the instructions in the terminal’s
user guide.
All devices on the bus should now be properly terminated.