Nematron Pointe Controller - Manual (Page 230)

Chapter 9: Troubleshooting Pointe Controller User Guide
228
9.1 LED Boot Indicators
The first thing to look at when the controller is installed, connected to a hub or
PC and everything is powered up, is the diagnostic LEDs:
The first thing that happens when the controller is powered up is that is checks its
operating program. This process takes a couple of seconds. If the operating
program does not check out, the RS232 TX (transmit) LED will flash at a rate of
about 1 flash per second. If this should happen, the base must be loaded with
operating software.
After the startup program check (as long a programming cable is not plugged
into the RS232 port), the base will enter its main program. At this point, the
Select LED should be on indicating the program is interfacing the ethernet
electronics.
The next thing to look at is the Link (L) LED. If it is on, there is a good ethernet
link. Ethernet devices send a periodic “link pulse”. The ethernet receiver on the
other side looks for this link signal. If it is received, the link LED will light. Link
LEDs should be on, both on the RTU and the hub.
If the link LEDs do not come on, one of the following problems probably exists.
The cable between the hub and the RTU is defective (improper
connections, bad connections, etc.)
The hub or the RTU is not turned on.