Chapter 10 BCU operation and communication status
116 BMTX-SVN01C-EN
LEDs for communication status
A row of green and a row of yellow LEDs, located in the upper left corner
of the main circuit board, indicate communication status between the
BCU and UCMs and with BACnet.
Two green LEDs, located below the modem card, indicate modem commu-
nication status.
Two green LEDs and one yellow LED, located in the lower right corner of
the main circuit board, indicate Ethernet communication status.
See Figure 39 on page 117 for LED locations on the BMTX BCU. See
Table 28 for an explanation of their meaning.
Table 28. LED codes for communication status
Communication
status of...
LED Meaning
Comm3 CR1 (green) Flickers during transmission of data.
CR7 (yellow) Flickers during reception of data.
Comm4A CR2 (green) Flickers during transmission of data.
CR8 (yellow) Flickers during reception of data.
Comm4B CR3 (green) Flickers during transmission of data.
CR9 (yellow) Flickers during reception of data.
Comm5 CR4 (green) Flickers during transmission of data.
CR10 (yellow) Flickers during reception of data.
BACnet CR5 (green) Flickers during transmission of data.
CR11 (yellow) Flickers during reception of data.
Modem CD
(Carrier detect)
CR13 (green) On steady indicates that a communication session has been established
between the BCU modem and the remote modem.
Modem RI
(Ring indicator)
CR16 (green) Pulsing (with the same cadence as a ringing telephone) indicates that a
remote modem is calling the BCU modem.
Ethernet CR20 (green) Communication data rate (Off—10 Mb rate; On—100 Mb rate)
CR21 (green) Flickers during transmission of data.
CR23 (yellow) On steady indicates a valid Ethernet connection (link light).
Flickers during reception of data.
Not used CR6 (green —
CR12 (yellow) —
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