Rockwell Automation 1785-TR10B2 User Manual
Installation Instructions
Coax Transceiver for 10BASE2
1785-TR10B2
The mini coax transceive r enables a devi ce with an AUI int erface to connec t
to a 10 Mbit/s CSMA/CD LAN (ISO/IEC 8802-3, IEEE 802.3, 10BASE2)
via a coaxial cable.
•
Monitoring LEDs for
– power
– collision/jabb er control
– data
•
SQE test can be disabled
externally
•
Can be plugged directly to the device interface
•
Low current consumption
•
Compact construction
To the Installer
Topic Pa ge
Description 2
Installation 2
Compliance to European Union Directives 4
Technical Data 7
1785-5.18 - January 1999
2 Coax Transceiver for 10BASE2
Description
The 1785-TR10B2 mini coax transceiver can be connected to the AUI
interface of a device either directly or via an AUI cable. It is connected to
the coaxial cable by a BNC socket. The mini coax transceiver offers these
functions according to IEEE 802.3 10BASE2:
•
indication via a LED of data transmission and reception through the
coaxial cable
•
detection of data collisions in the network and reporting them to the
terminal equipment as well as indicating them by a LED
•
Jabber control and di splay: p rotecti ng the ne twork from dat a packets that
are too long (> 25 ms)
•
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
Tx
Tx-Packet
Detect
ENABLE/
DISABLE
DO
Installation
Jabber
Protect
BNC interface
(to 10BASE2)
Collision
Detector
Rx
SQE-Test
GeneratorGenerator
Collision
Oscillator
Rx-Data
CI
AUI interface
(15-pole SUB-D connector)
DI
Coaxial Cable Connection
1. Cut off the coax cable (10BASE2) at the connection point.
2. Apply BNC connectors to both ends of the cable.
3. Put the two ends tog ether vi a a BNC-T-adapter , which you co nnect to the
BNC socket of the transceivers.
4. When connecting to the end of a coax cable, apply a BNC terminator
(50
Ω) to the unused socket of the T-adapter.
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Important:The minimum distance between two transceivers along a coax
cable is 0.5 m.
Coax Transceiver for 10BASE2 3
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 Setting
The slide switch loca ted on the top of the tr ansceiver case is use d to acti vate
and deactivate the SQE t est. Before pl acing the tr ansceiver in operation, you
should check to see whether the connected device requires the SQE test to
be on or off. As delivered from the factory, the SQE test is on.
Connecting Devices
Connecting two devices
Connecting more than two devices
Ter mi na tor
PC
1785-TR10B2
PC
* The maximum length is valid between the PC and the terminator.
For Additional Information
Terminator
10BASE2 (max. 185 m *)
BNC-T-Adapter
* The maximum length is valid between the PC and the terminator.
Terminator
10BASE2 (max. 185 m *)
1785-TR10B2
min. 0.5 m
BNC-T-Adapter
PLC5E
PLC5E
PLC5E
For standards information, go to
copy of this publication, go to
http://www.theautomationbookstore.com/.
http://www.ieee.org/. To download a .PDF
1785-5.18 - January 1999
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