ABB Series Gebruikershandleiding - Pagina 10

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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.

LED Position

TXD

RXD

PERR

BERR

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.

Subject to change without notice

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MATRIX Series |

Figure 1-10 Network Diagnostic LEDs

Table 1-1: EIA-485 LED Diagnostics

Notes

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.

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.

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.

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.

Communication Connections