Cylon American Auto-Matrix Aspect Matrix MAX Hardware installatiehandleiding - Pagina 10

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1.4.2.3

LED I

NDICATION

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

AspectFT-Matrix MAX Area Controller Installation Guide

Figure 1-10 Network Diagnostic LEDs

Table 1-1: EIA-485 LED Diagnostics

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.

NOTE

This

product

communication drivers.

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.

TXD

RXD

PERR

BERR

Notes

utilizes

native

Therefore, all network

(1/05/2015)

EIA-485

1-9