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Description – Rockwell Automation 1785-TR10BT Twisted Pair Transceiver Installation Instructions User Manual

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1785-5.20 - January 1999

2

Twisted Pair Transceiver

Description

The 1785-TR10BT twisted pair transceiver can be connected to the AUI
interface of a device either directly or via an AUI cable. It is connected to
the twisted pair cable by a 8-pin RJ45 socket.

The twisted pair transceiver offers these functions according to IEEE 802.3
10BASE-T:

indication via a LED of data transmission and reception through the
twisted pair cable

detection of data collisions in the network and reporting them to the
terminal equipment as well as indicating them by a LED

ability to enable/disable the SQE test: at the end of every transmit
operation, a short collision signal (heart beat) approx. 1 µs long is sent to
monitor the electronics

jabber control and display: protecting the network form data packets that
are too long (> 20 ms)

link control and display: continious moni-toring the twisted pair cable
segment with link test pulses for short-circuits or idling

auto polarity exchange (APX) and display: the polarity is reversed
automatically if the receiving wire pair is connected incorreclty (RD+
and RD- switched round)

DO

CI

DI

SQE-Test

Generator

Osc.

ENABLE/
DISABLE

Collision

Tx-Packet

Detect

Link

Status

Control

Rx-Data

Tx-Data

Jabber
Protect

Loopback

Data

Rx-Data

Auto Polarity
Exchange

Rx-Packet

Detect

DISABLE

ENABLE

10BAS

E

-T

In

terf

ace

(R

J4

5

co

n

n

ect

or

)

A

U

I In

te

rf

ac

e

(15-pi

n sub-

D c

onnec

tor

)