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8. Serial Port Issues
a. Is the correct protocol configured for the channel in question? On both ends of the system?
b. Is the correct half of the connector used for each channel: the lower row is the first channel, the upper
row is the second channel.
c. For non-isolated ports: is the equipment connected powered from the same ground reference as the
914-HDE stack?
d. Tx is output from the 914, Rx is received (input) to the 914. Are these crossed?
e. For RS485/422: Is the +/- polarity swapped?
f.
For RS485: Is the timeout configured for the port appropriate for the baud rate of the attached
equipment? Slower data rates typically require longer timeouts. The timeouts represent the turnaround
time of the half duplex protocol to change from Rx to Tx and vice-versa.
g. Is differential termination required for RS422/485? This can be enabled and disabled via the GUI. In a
multi-drop RS485 network, only the final node requires termination. The 914-HDE serial ports default
to enabling the 120 ohm on-board termination, this must be disabled if termination already exists in
the system.
9. Overheating issues
a. What is the junction temperature of each FPGA in the system (one per card)? None should exceed 100
C (red) in the GUI.
b. What is the measured temperature of the optical transceiver? Does it enter the yellow or red zones in
the GUI?
c. If excess temperature is an issue, better thermal management is required:
i.
Better conductive cooling via mounting standoffs. All 914-X Series cards have a thermal plane
in the PCB connected to the mounting holes. This thermal plane is isolated from digital ground
and may be conductively tied to the installed enclosure for cooling purposes.
ii.
Thermal spreaders can be attached to hot components
iii.
Thermal gap pad can be installed below the 914-HDE motherboard to push heat to the
enclosure, if any.
iv.
In surface systems, airflow should be applied.
10. 914-VDX / 914-EX Expansion channel shows faults
a. Alter the Driver Voltage for the faulty card in the configuration settings tab in the GUI. Reduce the
voltage for short expansion links, increase for longer links. The minimum should be 682 mV.
b. Are the firmware revisions of the cards compatible? Refer to Section 0.
11. 914-VDX Serial Data LEDS are constantly flashing when nothing is plugged in
a. Firmware revision incompatibility. Refer to Section 0.
b. Expansion channel corruption, check #10.
c. Optical link issues.
12. Unknown problem:
a. Are all cards in the system shown in the GUI? If not, why? Check #2 above.
b. Using the 914 Diagnostic GUI, open and close tabs looking for anything 'RED', this indicates a problem
that should be addressed.
i.
Voltage
ii.
Temperature
iii.
Optical power
iv.
Dropped Ethernet Frames
v.
Optical link problems
vi.
Expansion link problems
Focal Technologies Corporation
A Moog Inc. Company
Model 914-X Series Modular Multiplexer System User Manual
Document Number: 914-0601-00 Rev. 5.0
Page 14-3
- Quick Links:
- Figure 1-1: 914-X Series Hde Motherboard
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