Rockwell Automation 1785-TR10B5 User Manual
Installation Instructions
Coax Transceiver for 10BASE5
Catalog Number 1785-TR10B5
The coax transceive r lets you con nect a d evice wit h an AUI i nterface to a 10
Mbit/s CSMA/CD LAN (ISO/IEC 8802-3, IEEE 802.3, 10BASE5) coax
cable connection via this cable piercing tap.
•
Monitoring LEDs for
– power
– collision/jabb er control
– data
•
SQE test can be disabled
externally
•
Compact construction
To the Installer
Description
Topic Pa ge
Description 1
Installation 2
Coupling the Transceivers with the Coax Cable (10BASE5) 2
Compliance to European Union Directives 4
Technical Data 7
The 1785-TR10B5 coax transceiver can be connected to the AUI interface
of a device either directly or via an AUI cable. It is connected to the coax
cable by a coax interface.
The transceiver offers these functions according to IEEE 802.3 10BASE5:
• receiving the data at the transceiver interface and sending them into the
coax cable
• receiving the data from the coax cable and sending them to the
transceiver interface
• indication via a yellow LED of data transmission and reception through
the coax cable
• detection of data collisions in the network and reporting them to the
terminal equipment as well as indicating them by a red LED
• 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
• jabber control and display: prote cting the network fr om data packe ts t hat
are too long (> 20 ms)
1785-5.17 - January 1999
2 Coax Transceiver for 10BASE5
Installation
DO
CI
DI
Coax
cable
TX
TX Packet
Detect
Jabber
Protect
Collision
Detect
RX
ENABLE/
DISABLE
SQE-Test
Generator
Collision
Osc.
RX-Data
SQE Test
The slide switch located beside the three control LEDs is used to activate
and deactivate the SQE test.
Important:Before placing the transceiver in operat ion, you shoul d check to
see whether the conn ected dev ice requ ires th e SQE test to be on
or off.
Coupling the Transceivers with the Coax Cable (10BASE5)
Power Supply
The operating voltage (+12 V) is taken from the connected device via the
15-pin Sub-D socket of the AUI interface.
1785-TR10B5 with cable piercing tap
The vampire ter minal consists of these single items :
• 1 top section
• 1 socket-head cap screw
• 1 bottom section
• 2 contact springs
• 1 contact needle
The distance between two transceivers fitted on the same coax segment
must be at least 2.5 meters.
1785-5.17 - January 1999
Coax Transceiver for 10BASE5 3
socket-head
cap screw
socket
spanner
top section
contact spring
bottom section
contact needle
socket-head
cap screw
drill
Assembly
1. As shown in the figure, i nsert the two contact springs in the bot tom part.
Do not screw in the contact needle.
2. Determine the required coupling point on the coax cable.
3. Place the coax cable in the bottom section.
4. Push the top section onto the bottom section.
5. Screw the socket-head cap screw into the top section using the socket
spanner, and tighten it.
6. Drill into th e cable with the drill of the combination tool.
Important:Drill cleanly, i.e.:
no protruding wires of the cable shield visible in the drill hole (risk of
–
short-circuit)
– drill hole penetrates the braiding and foil of the shield so that the
dielectric of the cable (plastic layer between centre conductor and
shield) is visible
coax cable
(10BASE5)
contact needle
hexagon screw key
7. If it is not possible to drill deeply enough, tighten the socket-head cap
screw further.
Important:Tighten the screw gently!
8. Screw in the contact needle using the hexagon screw key of the
combination tool.
9. Insert the pre-assembled vampire terminal in the housing of the
1785-TR10B5 until it bottoms and secure it with the M3 screws
included.
For Additional Information
For standards information, go to
copy of this publication, go to
http://www.ieee.org/. To download a .PDF
http://www.theautomationbookstore.com/.
1785-5.17 - January 1999
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