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CHAPTER 6: Troubleshooting
The LEDs indicate data activity, but data communication isn’t
really happening.
1. Check the pinning of your RS-232 cable and of
your device’s RS-232 port.
2. Check the data-rate settings of both SHM-B Sync
units; they must be set to the same data rate. And
both of the attached devices must be set to receive
clock from the SHM-B Sync.
3. Are any of the cables too long? RS-232 cables
shouldn’t be longer than 50 ft. (15.2 m); see
Appendix A
for distance guidelines for the 4-wire
twisted-pair cable.
No data is being transferred in either direction.
1. Make sure the RS-232 cables are securely
connected at both ends.
2. Is the 4-wire cable connected and wired properly?
Make sure the four wires are securely connected to
the proper terminals on your SHM-B Sync; refer to
Figure 4-1 on page 14 for end-to-end pinning. If
the wires are connected properly, check the data-
rate settings of your SHM-B Sync units and make
sure that the attached devices are set to receive
clock from them. (If your SHM-B Sync units are
standalone models, these inspections will require
that you carefully open their cases—see
Chapter 3
.)
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