Contemporary Control Systems EXP Expansion Modules User Manual - Manual (Page 21)

2.7 Ensuring Proper HUB Operation
Check each port's line activity indicator. All indicators on the
front panel of the active hub should light up when the hub is
turned on, assuming the cables connected to the hub are also
connected at the other end to ARCNET network interface
modules or active hubs. Please note that the RECON indicator,
in the right-most location on the front panel, will only flash for a
second when the hub is powered on or when reconfigurations
occur on the network. The other three indicator lights located in
line with the RECON indicator, specifically the +PWR, –PWR
and TIMING indicators, should always be lit when the hub is on
and operating properly. Additionally, the activity indicator for
each port should be lit if a cable is connected to that port and
the device at the opposite end of the cable is on. Refer to the
next section covering troubleshooting tips if normal hub
operation is not observed.
2.8 Troubleshooting Tips
If one of the devices in your ARCNET LAN loses its
communications capabilities after the MOD HUB has been
installed and used, first check the four indicator lights on the
timing module, the right-most module on the front panel of the
MOD HUB unit.
Note: Whenever any problems occur with the MOD HUB
unit, carefully document exactly what happened and what
steps you took to handle the problem. This will assist us in
helping you solve the problem.
2.8.1 Timing Module Indicators
+PWR This indicator should be lit when the MOD HUB is
powered. The internal positive DC power is continually
monitored to verify that this voltage is within specification. If
this indicator is not lit when the hub is turned on, there is a
problem with the internal positive power supply.
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