3
Overview
The BMUX Comms Module is a flat, 4x11 option module that plugs into the 4100U/4100ES
power distribution interface.
Figure 1. BMUX Comms Module
BMUX Comms
Module LEDS
The BMUX Comms Module has the following status indicating LEDs (see Table 1):
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STATUS INDICATING LEDS
Table 1: Status Indicating LEDs
LED Name
Meaning
Coding
Color
COMM
TBL LED 3
Turns on when the Comms Module is
not communicating with the system
CPU
On Steady during comm loss. Flashing during
firmware failure
Yellow
Earth LED 1
Earth Fault Trouble
On Steady when earth fault is detected on the
field wiring
Yellow
Loop Tbl
LED 2
DC Loop communications channel
trouble
1 blink for no response on primary channel
2 blinks for no response on secondary channel
Solid on when no response on either channel
Yellow
The 4100U/4100ES BMUX Comms Module,
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