Rockwell Automation 1785-TR10BT User Manual

Installation Instructions

Twisted Pair Transceiver

Catalog Number 1785-TR10BT

The twisted pair transceiver enables a de vice with an AUI interface to connect to a 10 Mbit/s CSMA/CD LAN (ISO/IEC 8802-3, IEEE 802.3, 10BASE-T) via a shielded twisted pair cable.

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Monitoring LEDs for

– power – collision/jabb er control/

TxData

– RxData – link state/auto polarity

exchange

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SQE test can be disabled externally

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Can be plugged directly to the device interface

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Low current consumption

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Compact construction

To the Installer

Topic Pa ge

Description 2 Installation 3 Compliance to European Union Directives 4 Technical Data 7

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:

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

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

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ability to enable/disable the SQE test: at the end of every transmit

operation, a short collis ion signal ( heart beat) app rox. 1 µs long is sent to monitor the electronics

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jabber control and d ispla y: pr otect ing t he net work form d ata pa ckets that are too long (> 20 ms)

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

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

10BASE-T Interface

Jabber Protect

Tx-Data

Tx-Packet

Detect

Link Status Control

(RJ45 connector)

Rx-Packet

Detect

Rx-Data

Auto Polarity Exchange

DISABLE

ENABLE

ENABLE/ DISABLE

SQE-Test

Generator

Collision Osc.

Loopback

Data

Rx-Data

AUI Interface

(15-pin sub-D connector)

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Twisted Pair Transceiver 3

Installation

Link Attenuation

ISO/IEC 8802-3 (10BASE-T) specifies that the link attenuation of a single cable segment must not exceed 11.5 dB at frequencies between 5 and 10 MHz (ZL = 100 Ω). This value includes

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the attenuation of the twisted pair cable

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connector attenuation

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reflection attenuations as the result of adaption errors of the various components belonging to the single cable segment, e.g., patch panels in which twisted pair cables are connected to each other which, within the scope of the tolerance, have differing characteristic impedance values at the coupling point

Power Supply

The operating voltage (+12 V) is taken from the connected device via the 15-pin Sub-D socket of the AUI interface.

SQE Test

The slide switch on the top of the transceiver case is used to activate and deactivate the SQE test. Before plac ing the trans ceiver in ope ration, you should check to see whether the connected device requires the SQE test to be on or off. As deli vered from the factory, the SQE test is on.

Connecting two devices

PC PLC5E

1785-TR10BT 1785-TR10BT

Twisted pair cable (100 Ω)

with RJ45 connectors

Connecting to an unshielded twisted pair interface card (hub, switch)

Hub

1785-TR10BT

or direct-connected to RJ45

Twisted pair cable (100 Ω)

with RJ45 connectors

1785-TR10BT

PLC5E

Pin assignments of the RJ45 to RJ45 connecting lead

RJ45 RJ45

1 2 3 6

Pin assignments of the RJ45 to RJ45 connecting lead

RJ45 RJ45

1 2 3 6

For Additional Information

For standards information, go to copy of this publication, go to

http://www.theautomationbookstore.com/.

http://www.ieee.or g/. To download a .PDF

1785-5.20 - January 1999

+ 5 hidden pages