Patton electronics 2020, 2020N 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).

1.2 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 2020 or 2020N. 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 (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 converterslet 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.

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.

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3.0 CONFIGURATION

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

any

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

own

orientation. For example,
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.

Figure 1. Inserting the screw driver

RS-232

Interface