Patton 3002 User Manual

USER
MANUAL

SALES OFFICE
[phone]
TECHNICAL SUPPORT
[phone]
http://www.patton.com

MODEL 3002

RS-232 Tail Circuit
Buffer

An ISO-9001

Certified Company

Part #07M3002-A
Doc. #011021U
Rev. B
Revised 1/22/08

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1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 3002 components to be

free from defects, and will—at our option—repair or replace the
products should they fail within one year from the first date of shipment.

This warranty is limited to defects in workmanship or materials,
and does not cover customer damage, abuse or unauthorized
modification. If these products fail or do not perform as warranted, your
sole recourse shall be repair or replacement as described above.
Under no condition shall Patton Electronics be liable for any damages
incurred by the use of these products. These damages include, but are
not limited to, the following: lost profits, lost savings and incidental or
consequential damages arising from the use of or inability to use this
product. Patton Electronics specifically disclaims all other warranties,
expressed or implied, and the installation or use of this product shall be
deemed an acceptance of these terms by the user.

1.1 RADIO AND TV INTERFERENCE

The Model 3002 generates and uses radio frequency energy, and
if not installed and used properly—that is, in strict accordance with the
manufacturer's instructions—may cause interference to radio and
television reception. The Model 3002 has been tested and found to
comply with the limits for Class A computing devices in accordance
with the specifications in Subpart J of Part 15 of FCC rules, which are
designed to provide reasonable protection from such interference in a
commercial installation. However, there is no guarantee that
interference will not occur in a particular installation. If the 3002 does
cause interference to radio or television receivers, which can be
determined by disconnecting the RS-232 interfaces, the user is
encouraged to try one or more of the following measures: move the
computing equipment away from the receiver, re-orient the receiving
antenna and/or plug the receiving equipment into a different AC outlet
(such that the computing equipment and receiver are on different
branches).

1.2 CE NOTICE

The CE symbol on your Patton Electronics equipment indicates
that it is in compliance with the Electromagnetic Compatibility (EMC)
directive and the Low Voltage Directive (LVD) of the Union European
(EU). A Certificate of Compliance is available by contacting Technical
Support.

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1.3 SERVICE

All warranty and non-warranty repairs must be returned freight
prepaid and insured to Patton Electronics. All returns must have a
Return Materials Authorization number on the outside of the shipping
container. This number may be obtained from Patton Electronics
Technical Support: [phone]; http://www.patton.com; or,

[e-mail].

NOTE: Packages received without an RMA number will not be

accepted.

Patton Electronics' technical staff is also available to answer any

questions that might arise concerning the installation or use of your
Model 3002. Technical Support hours: 8AM to 5PM EST, Monday

through Friday.

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2.0 GENERAL INFORMATION

Thank you for your purchase of this Patton Electronics product.
This product has been thoroughly inspected and tested and is
warranted for One Year parts and labor. If any questions or problems
arise during installation or use of this product, please do not hesitate to
contact Patton Electronics Technical Support at [phone].

2.1 FEATURES

• Provides DCE to DCE connection

• Two internal 64-bit buffers

• Synchronous data rates up to 64kbps

• No AC power required

• External configuration switches

• Ultra-miniature size

• Made in the USA

2.2 DESCRIPTION

The Patton Model 3002 Tail Circuit Buffer is a cost-effective

solution for the interconnection of two modem type devices that are
required to be connected in a tail ciruit configuration. Data is buffered
and re-clocked in both directions to insure data integrity when using two
modems that must be clocked independent of each other. The Model
3002 allows the user to connect a tail circuit to a DCE type device.
Modems, sharing devices or multiplexers that will not normally
accommodate a DCE type device, can have a tail-ciruit attached to a
sub-channel port through use of this device.

Clock phasing differences are compensated for by buffering the
data coming from the tail circuit into a 64 bit centered buffer. This gives
32 bits of clock slippage in both the positive and negative direcitons.

The 3002 can monitor the DCD interface lead from each of the
modem devices and optionally use the DCD signal (pin8) to recenter
the buffers to prevent the buffers from filling up during periods of
inactivity. Clocking rates up to 64kbps are possible while using the

3002. The unit is totally transparent to your data. For easy
configuration, the Model 3002 features a convenient set of external
configuration switches. These switches allow the user to control buffer
centering by enabling or disabling the carrier detect option.

Housed in an ultra-miniature ABS plastic case, the Model 3002
comes equipped with two DB-25 female connectors.

Synchronous operation in both Half Duplex and Full Duplex
operation is fully supported. Carrier Detect signaling can be used to re­center the ring buffers. All cabling crossover is done in the Model 3002,
allowing utilization of standard “Straight Through” cables for all
interconnections.

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3.0 CONFIGURATION

The Model 3002 is simple to install and designed for excellent
reliability. The following instructions will help you set up and install your
buffer properly. If you have any questions, please call Patton Technical
Support at [phone].

The Model 3002 uses a set of eight external DIP switches (see
Figure 1). Because all eight switches are in one externally accessible
DIP switch package, there is no need to open the case for
configuration. The following section describes the switch package
location, positions and functions.

To configure your unit, use a small screwdriver and gently push
each switch to its proper setting. The ON and OFF positions are shown
in Figure 2.

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Figure 1. The location of the the Model 3002 configuration switch package

Figure 2. The miniature configuration switch package

J1

ON

12345678

12345678

OFF

DHS-8

The Model 3002 is shipped factory configured for Carrier Detect
Option = Constant Carrier. If DCD (pin 8) centering is required (Carrier
Detect Option = Switched Carrier), the DIP switches should be
changed as described below.

When the carrier detect option is set for “constant carrier”, the
DCD signal will have no effect on buffer operation. In the event of an
overflow or underflow, the buffer will re-center at 32 bits.

When the carrier detect option is set for “switched carrier”, buffer
centering is controlled by the DCD interface control signal (pin 8). In the
switched carrier mode, the buffer will re-center at 32 bits when DCD
transitions from OFF to ON.

3.1 CARRIER FROM J1

S1, 2, 3, and 4 control buffering of the data from port J1 to port J2.
For constant carrier operation, set S1 and S3 to ON and S2 and S4 to
OFF. For DCD buffer control, set S1 and S3 to OFF and S2 and S4 to
ON.

Switch

1 2 3 4
Switched Carrier OFF ON OFF ON
Constant Carrier ON OFF ON OFF (factory default)

3.2 CARRIER FROM J2

S5, 6, 7, and 8 control buffering of the data from port J2 to port J1.
For constant carrier operation, set S5 and S7 to ON and S6 and S8 to
OFF. For DCD buffer control, set S5 and S7 to OFF and S6 and S8 to
ON.

Switch

5 6 7 8
Switched Carrier OFF ON OFF ON
Constant Carrier ON OFF ON OFF (factory default)

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4.0 INSTALLATION AND OPERATION

The Patton Model 3002 is very simple to install. After setting the
DIP switches, simply connect the unit between the two DCE devices.
All crossover wiring is done within the 3002, allowing the use of
standard “straight through” cables. Operating power is derived from the
RS-232 data and control signals. No external power supply is required.

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APPENDIX A

PATTON MODEL 3002 SPECIFICATIONS

Application: Interconnect two RS-232 Modem type

devices, in Half or Full Duplex Operation

Data Format: Synchronous, transparent to protocol

Modem-to-Modem

Buffering: Dual 64-bit ring buffers

Carrier Detect

Options: Switched Carrier Mode:

Buffer set to 32 bits when DCD (pin 8)
transitions from OFF to ON

Constant Carrier Mode:
Buffer set to 32 bits in case of overflow or
underflow

Data Rates: Up to 64kbps

Timing: Provided by the connected DCE devices

Connectors: Two DB-25 female connectors

Power Supply: No external AC power required. Uses low

power derived from RS-232 data and
control signals

Environmental: Oper Temp: 32 to 122

o

F (0 to 50oC)
Rel Humidity: 5 to 90 % non-condensing
Altitude: 0 to 10,000 feet

Dimensions: 3.15”L x 1.76”W x .76”H

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APPENDIX B

PATTON MODEL 3002 BLOCK DIAGRAM

Copyright ©

Patton Electronics Company

All Rights Reserved

8

Modem 1

Modem 2

(DCE) (DCE)

3002

64-bit Ring Buffer

TD—

2

TXC—

15

XTC—

24

64-bit Ring Buffer

RD—

3

RXC—

17

RTS—

4

DCD—

8

DSR—

6

DTR—

20

FG—

1

3—

17—

2—

15—

24—

8—

4—

20—

6—

1—

RD

RXC

TD

TXC

XTC

DCD

RTS

DTR

DSR

FG

SG—

CTS—

7—

5—

SG

CTS

7

5

An ISO-9001

Certified Company

Dear Valued Customer,

Thank you for purchasing Patton Electronics products! We do

appreciate your business. I trust that you find this user manual helpful.

We manufacture one of the widest selections of data communications
products in the world including CSU/DSU's, network termination units,
powered and self-powered short range modems, fiber optic modems, interface
converters, baluns, electronic data switches, data-line surge protectors,
multiplexers, transceivers, hubs, print servers and much more. We produce
these products at our Gaithersburg, MD, USA, facility, and can custom
manufacture products for your unique needs.

We would like to hear from you. Please contact us in any of the
following ways to tell us how you like this product and how we can meet your
product needs today and in the future.

Web: http://www.patton.com

Sales E-mail: [e-mail]

Support E-mail: [e-mail]

Phone - Sales [phone]

Phone - Support [phone]

Fax: [phone]

Mail: Patton Electronics Company

7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA

We are committed to a quality product at a quality price. Patton
Electronics is ISO 9001 certified. We meet and exceed the highest standards
in the industry (CE, UL, etc.).

It is our business to serve you. If you are not satisfied with any
aspect of this product or the service provided from Patton Electronics or its
distributors, please let us know.

Thank you.

Burton A.Patton
Vice President

P.S. Please tell us where you purchased this product:

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