ABB MATRIX Series - LED Indication

MATRIX Series | Communication Connections
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10
MAN0124 rev 5
LED INDICATION
Located below the network termination and biasing switches is a set of diagnostic LEDs that can be useful for
troubleshooting network communication problems.
Figure 1-10 Network Diagnostic LEDs
Table 1-1: EIA-485 LED Diagnostics
LED Position
Notes
TXD
This LED will flash anytime data is transmitted by the
Matrix Area Controller to the field bus network. On an
active network, this light should flash anytime the
device passes a network token to another device or
routes a request made by another device.
RXD
This LED will flash anytime data is received by the
Matrix Area Controller from the field bus network. On
an active network, this light should flash anytime
there is activity on the network.
PERR
This LED will flash upon the event a parity error occurs
on the network. A parity error is caused by a mismatch
between the calculated checksum and value received
with the packet. The most common reason for a
packet error is if more than one unit is attempting to
communicate on the network at once, indicating the
presence of a duplicate token or duplicate address.
BERR
This LED will flash upon the event a byte error occurs
on the field bus network. A byte error is caused when
information is lost during network communications,
and is detected in the start, stop, or data bit timings.
The most common reason for a byte error is due to
devices attempting to communicate on the network
at different baud rates.
Note : This product utilizes native EIA-485 communication drivers. Therefore, all network communications to field-
devices should occur over specified network media as outlined in American Auto-Matrix product
documentation. The use of media converters (such as Serial-to-Ethernet modems) not certified or sold by
AAM is discouraged.