Crown SMX 1 Troubleshooting Manual Download Page 18

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18 — Troubleshooting

Notes

Rev 3-97

@ Crown

5. Addresses are set by eight segment DIP switches on IQ components. What
addresses are not considered valid?

6. How can you quickly determine whether a communication problem is most
likely between the computer and interface or on the Crown Bus?

7. How does Break Detect work?

8. List as many conditions as you can think of that would constitute a break in
a Crown Bus loop.

9. If you measure 0.7 VDC across the positive and negative terminals of a Crown
Bus connection, what does this indicate?

10. What are the limitations of a mixer (SMX-6 or AMB-5) as system interface?

Summary of Contents for SMX 1

Page 1: ...ered with IQ List the configuration parameters that must match between software and interface hardware State the maximum operating length RS232 and RS422 State the maximum loop capacitance for normal...

Page 2: ...igure 2 6 Voltage Measurement Open Figure 3 7 Voltage Measurement Reverse Polarity Figure 4 8 Current Measurement Figure 5 9 Does The Software Run PC Requirements Environment Windows DOS Corrupt or In...

Page 3: ...e right general area for the exact problem Specifically is the process of defining the exact nature of the problem Example When taking a Roll Call all components appear except those in equipment room...

Page 4: ...ments for the type of software being used IQ components are not likely to fail but it is not impossible Lightening is a respecter of no one The most common type of hardware failure is opto isolator da...

Page 5: ...ponent address To save time later it is always recommended that you mark components with their loop address and annotate system drawings to accurately reflect those addresses TOOLS AVAILABLE There are...

Page 6: ...for some reason such as power loss the On Line Search feature will automatically reestablish communication with that component when power is restored It will also restore communication to a whole loo...

Page 7: ...ect It is a feature you would use if you were not able to establish loop communication initially you missed the alert on the screen or you want to verify the break To use Search you need to select the...

Page 8: ...e versed If you have no voltage drop at all the problem may be an open in one of the wires between the output of the upstream device and the point of measurement as shown in Figure 3 It could alsobeas...

Page 9: ...oop Figure 5 shows a test rig setup for wave form mea surement Note that if an ungrounded scope is used it makes no difference whether the resistor is in the positive or negative leg but if a grounded...

Page 10: ...e prob lem may result in loss of high current or low current values When the problem isextremelyhighRFItheproblemismorelikelytobealossoflowcurrentvalues OUT IN SMX 1 OUT IN SMX 2 OUT IN SMX 3 OUT IN S...

Page 11: ...you if you have taken the time to check available documentation It is also very helpful if you have serial numbers software revision numbers or other relavent information handy when you call If a har...

Page 12: ...1C Are any files corrupted Yes Re install the program No If the problem cannot be resolved contact Crown Figure 8 Troubleshooting Flow Chart Does the software run PC Requirements Operating System Corr...

Page 13: ...erface it is sometimes necessary to remove Pin 4 from the male connector on the standard RS232 cable Proceed to question 3C No Use the correct cable Question 3C Is the RS232 cable connected correctly...

Page 14: ...ay not have any two components of the same type at the same address on the same loop and that addresses of 0 and 251 255 are not valid Question 4C Does the software have valid OIF and DLL files for th...

Page 15: ...es the computer have a 16550 UART for the com port Yes Proceed to question 5B No Install a com port board with the 16550 UART chip This UART supports higher speeds and includes additional memory buffe...

Page 16: ...lation or if the product has been repaired three or more times in the warranty period the most recent being at the Crown Factory Advanced replacements are only available through firms who have establi...

Page 17: ...oftware in your hands A software upgrade is defined as an upgrade from one version level of software to a higher version level For example going from IQ For Windows 1 0 to version 1 1 would be an upgr...

Page 18: ...ion problem is most likely between the computer and interface or on the Crown Bus 7 How does Break Detect work 8 List as many conditions as you can think of that would constitute a break in a Crown Bu...