TDS2CM Communications Module
18
TDS 200-Series Extension Module Instructions
RS-232 Troubleshooting
If the oscilloscope and the external device (personal computer or
printer) have trouble communicating, use the following steps to
correct the problem:
1. Verify that the module is working. Refer to Checking Module
Installation on page 6.
2. Check that you are using the correct RS-232 cable. Determine
whether your external device requires a null-modem or a
straight-through connection. Refer to the table on page 12 for
information about RS-232 cables.
3. Check that the RS-232 cable is firmly connected to both the
oscilloscope and the correct port on the external device.
4. Check that the printer or the program on the personal computer is
using the same port to which you connected the RS-232 cable.
Try your program or printer again.
5. Check that the oscilloscope RS-232 settings match the settings
used by the external device:
a. Determine the RS-232 settings for the external device.
b. On the oscilloscope, push UTILITY
Options RS-232.
c. Set the oscilloscope to match the settings of the external
device.
d. Try your terminal-emulator program or printer again.
6. Try setting both the oscilloscope and the external device to a
slower baud rate.
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