Patton 2020N, 2020 User Manual

USER
MANUAL

MODEL 2020 and
MODEL 2020N

Interface Powered
RS-232 to V.35 Converters

CERTIFIED

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 2020 and 2020N
components to be free from defects, and will--at our option--repair or
replace the product should it 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 this product fails or does 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 this product. 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 Models 2020 and 2020N generate and use 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 2020/2020N
has been tested and found to comply with the limits for a Class A
computing device 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 Model 2020/2020N does cause
interference to radio or television reception, which can be determined
by disconnecting the RS-232 or V.35 interface, the user is encouraged
to try to correct the interference by one or more of the following
measures: moving the computing equipment away from the receiver,
re-orienting the receiving antenna, and/or plugging the receiving
equipment into a different AC outlet (such that the computing
equipment and receiver are on different branches).

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 2020 or 2020N. Technical Support hours: 8AM to 5PM EST,

Monday through Friday.

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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2.0 GENERAL INFORMATION

3.0 CONFIGURATION

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 (301)-975-1007.

2.1 FEATURES

• Bi-directionally converts synchronous RS-232 to V.35

• Data rates to 384 Kbps, full or half duplex

• Transparent to protocol

• No AC power or batteries required

• DCE/DTE strap selectable

• DB-25 and M/34 connectors with integral 6 ft cable (Model 2020)

• Dual DB-25 connectors with integral 6ft cable (Model 2020-25)

• DB-25 and M/34 connectors in one plastic enclosure (Model 2020N)

• Circuitry housed in ultra-miniature case

• Made in the USA.

2.2 DESCRIPTION

The Model 2020 and 2020N RS-232 to V.35 converters let a

synchronous RS-232 device communicate bi-directionally with a
synchronous V.35 device. The Model 2020/2020N require no AC power
or batteries to operate and supports data rates to 384 Kbps. Operating
full or half duplex, the Model 2020 passes all necessary clocking and
control signals, and is transparent to protocol.

The Model 2020 connects directly to the synchronous RS-232
interface using a male or female DB-25 connector. A male or female
M/34 connector at the end of an integral 6 ft cable plugs into the V.35
device. The Model 2020-25 substitutes a male or female DB-25 on the
V.35 interface. The Model 2020N house both DB-25 and M/34
connectors within the same enclosure.

The Model 2020/2020N is designed to be easy to use. In most
cases you will not need to configure the Model 2020/2020N in
way: just plug it in and go! The Model 2020 is transparent to protocol,
including data rate and clocking method. the only configuration you
may need to do is for DTE/DCE orientation. This procedure is
described below.

3.1 SETTING DCE/DTE ORIENTATION

The Model 2020/2020N installs between DTE devices such as
terminals and host computers, and DCE devices such as modems,
multiplexers and CSU/DSUs. Most often the DTE device will be RS­232, and the DCE device will be V.35. Therefore, the default
DCE/DTE setting for the Model 2020 is RS-232 DCE to V.35 DTE,
based on how the Model 2020 "sees" its
if the Model 2020 sees its own RS-232 port as DCE, it will want to plug
into an RS-232 DTE device such as a terminal.

If you need to reverse the DCE/DTE orientation of the Model 2020
so that the RS-232 port is DTE and the V.35 port is DCE, follow the
step-by-step instructions below (note: it is not possible to configure the
Model 2020/2020N so that both ports are DTE or DCE).

3.1.1 OPENING THE CASE

The DCE/DTE strap on the Model 2020/2020N is located on the
PC board. To access the PC board you will need to open the plastic
case.

1. Simply insert a small flathead screw driver or similar tool
between the DB-25 connector and the lip of the case as
shown in Figure 1, below.

own

orientation. For example,

any

An internal DCE/DTE strap allows the user to configure the Model
2020/2020N as "DCE to DTE" or "DTE to DCE". In most cases, this
eliminates the need for special crossover cables. Housed in an ultra­miniature case measuring only 2.66" x 2.10" x 0.73", the Model 2020
fits easily into tight locations. The Model 2020N measures a tiny 3.20”L
x 2.10”H x 0.90”W.

RS-232

Interface

Figure 1. Inserting the screw driver

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2.

Gently

twist the screw driver to pop the case open as shown in
Figure 2, below. Be careful not to damage the case or
connector as you twist the screw driver.

RS-232

Interface

Figure 2. Popping open the case

3. Once you have opened the case of the Model 2020/2020N,
you will see the green DCE/DTE strap located on the PC
board in the position shown in Figure 3, below. The DCE/DTE
strap is oriented closest to the RS-232 interface.

5. To reverse the DCE/DTE orientation, pull the entire green
strap out of its socket and rotate it 180 degrees. Then plug it
back into the socket. You will see that the arrows on top now
point in the opposite directions, showing the new DCE/DTE
orientation of the Model 2020.

6. When you're done, realign the case halves (don't forget the
captive screws and saddle washers) and snap them back
together.

DCE/DTE

Strap

DCE

DTE

RS-232

Interface

Figure 3. DCE/DTE strap orientation on PC board

4. The arrows on top of the strap indicate the orientation of the
Model 2020's ports. For example, if the "DCE" arrow is
pointing toward the DB-25 connector, then the Model
2020/2020N's strap is set so that it sees its DB-25 port as
DCE. It wants to plug into the DB-25 port of a terminal or
other DTE. The arrow pointing toward the cable at the rear of
the PC board shows the orientation of the Model 2020's V.35
port.

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4.0 INSTALLATION

APPENDIX A.

After you have configured the DCE/DTE strap, all you need to do
is plug the Model 2020 or 2020N into the proper device ports. Figures
4 and 5 showhow to intstall the Model 2020/2020N.

*NOTE: The diagrams below show the Model 2020 in the installed

application. If you are using a Model 2020N, connect the RS-232

interface directly to the RS-232 equipment and connect the V.35

interface to the V.35 interface using a cable no longer than

164 feet (50m).

4.1 CONNECTING AN RS-232 DTE TO A V.35 DCE*

Figure 4 (below) illustrates proper connection of an RS-232 DTE
to a V.35 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DCE.

Sync. Terminal

(DTE)

V.35 Modem

(DCE)

Figure 4. A Common RS-232 DTE to V.35 DCE Installation

4.2 CONNECTING A V.35 DTE TO AN RS-232 DCE*

Figure 5 (below) illustrates proper connection of a V.35 DTE to
an RS-232 DCE using the Model 2020. The RS-232 interface of the
Model 2020/2020N must be configured as DTE.

V.35 Mini Computer

(DTE)

Sync. Modem

(DCE)

MODEL 2020 AND 2020N SPECIFICATIONS

Interfaces: EIA RS-232/ITU/CCITT V.24 to ITU/CCITT

V.35/EIA RS-530

Data Rates: 0 - 384 Kbps
Transmission Mode: Synchronous, full or half duplex
Protocol: Transparent to protocol
Clocking: Set by connected devices
Connectors: All Versions: DB-25 male or female on

RS-232 side;
Model 2020: M/34 male or female on V.35
side at the end of 6 ft. cable.
Model 2020-25: DB-25 male or female on
V.35 side at the end of 6 ft. cable.
Model 2020N: RS-232 Male with M/34
male or female on V.35 side OR, RS-232
female with M/34 male.

Power Supply: None required. Uses power from NIC data

and control signals

Temperature Range: 0-60 degrees C (32-140 degrees F)
Altitude: 0-15,000 feet (0-5,000 meters)
Humidity: 5 to 95% noncondensing

Figure 5. A common V.35 DTE to RS-232 DCE installation

4.3 CONNECTING THE MODEL 2020-25

The Model 2020-25 is connected the same way as the standard
Model 2020, with the exception that the V.35 interface has a DB-25
connector instead of an M/34 connector. The DB-25 carries the same
signals as the M/34, but is pinned according to the RS-530 Standard.
Please refer to Appendix B for specific pin out information.

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Dimensions: Model 2020: 2.66"L x 2.10"H x 0.73"W

(6.76cmL x 5.33cmH x 1.85cmW)
Model 2020N: 2.40”L x 1.73”H x 0.89”W
(6.10cmL x 4.39cmH x 2.26cmW)

Weight: Model 2020: 14 oz, including cable and

connectors
Model 2020N: 2.2 oz

APPENDIX B

APPENDIX C

V.35 INTERFACE STANDARDS

CCITT V.35/EIA-530 INTERFACE (DB-25)

Transmit Data B - 14

Transmit Clock A - 15

Receive Data B - 16

Receive Clock A - 17

Data Term. Ready (DTR) - 20

External Clock A - 24

CCITT V.35 Interface (M/34 Male)

Signal Ground -B
Clear To Send -D

Data Carrier Detect -F

Receive Data (A) -R
Receive Data (B) -T

Receive Timing (A) -V

Receive Timing (B) - X

DD

NN

RS-232 INTERFACE STANDARDS

RS-232C/V.24 INTERFACE (DB-25)

1 - (FG) Frame Ground
2 - Transmit Data A
3 - Receive Data A
4 - (RTS) Request to Send
5 - (CTS) Clear to Send
6 - (DSR) Data Set Ready
7 - (SG) Signal Ground
8 - (CD) Carrier Detect
9 - Receive Clock B

11 - External Clock B
12 - Transmit Clock B

B

A

D

F

E

J

L

K

N

R

P

T

V

U

X

Z

Y

BB

CC

FF

JJ

HH

LL

MM

A- Frame Ground

C

C- Request to Send
E- Data Set Ready

H

H- Data Terminal Ready
K­M-

M

P- Transmitted Data (A)
S- Transmitted Data (B)

S

U- Terminal Timing (A)
W- Terminal Timing (B)

W

Y- Transmit Timing (A)
AA- Transmit Timing (B)

AA
EE
KK

Transmit Clock - 15

Receive Clock - 17

Data Term. Ready (DTR) - 20

External Clock - 24

1- (FG) Frame Ground
2- (TD) Transmit Data
3- (RD) Receive Data
4- (RTS) Request to Send
5- (CTS) Clear to Send
6- (DSR) Data Set Ready
7- (SG) Signal Ground
8- (DCD) Data Carrier Detect

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APPENDIX D

Dear Valued Customer,

TD-A

RD-A

PRS

TD-B

V.35 DRIVER

BLOCK DIAGRAM

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

RD-B

RD-A

TD-A

RD-B

TD-B

TC-A

XC-A

XC-B

TC-B

XC-A

TC-A

TC-B

XC-B

RC-A

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RPT

S

YUW

U

Y

AA

W

AA

RC-B

V

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RTS

CTS

DSR

V.35

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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.

4

5

RS-232

6

RTS

CTS

DSR

following ways to tell us how you like this product and how we can meet your

We would like to hear from you. Please contact us in any of the

product needs today and in the future.

DCD

DTR

FG

FHA

SG

B

AUGUST 12, 1994 REV. D

Web: http://www.patton.com

Sales E-mail: [e-mail]

V.35

Support E-mail: [e-mail]

Phone - Sales [phone]

Phone - Support [phone]

Fax: [phone]

RS-232

8201

DCD

DTR

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PATTON ELECTRONICS MODEL 2020 BLOCK DIAGRAM

FG

SG

Mail: Patton Electronics Company

AMPLIFIER

DIFFERENTIAL

V.35 DRIVER

AMPLIFIER

DIFFERENTIAL

AMPLIFIER

DIFFERENTIAL

V.35 DRIVER

+5V

-5VPOWER SUPPLY
+V

7622 Rickenbacker Drive
Gaithersburg, MD 20879 USA

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

RS-232 V.35

AND

SWITCHING

REGULATOR

aspect of this product or the service provided from Patton Electronics or its
distributors, please let us know.

DATA

It is our business to serve you. If you are not satisfied with any

Thank you.

2

3

3

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15

15

24

TD

RD

RD

TD

XC

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XC

17

24154

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6820

RC

CTS

RTSXCTC

DTR

DCD

DSR

Burton A.Patton

Vice President

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