Patton electronics 222N9 User Manual

USER
MANUAL

MODEL 222N9

Ultra-miniature RS-232
(EIA-574) to RS-422
Interface Converter

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

Part #07M222N9-B
Doc. #030013U,
Rev. C
Revised 1/21/08

CERTIFIED

An ISO-9001

Certified Company

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 222N9 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 Model 222N9 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 222N9 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
222N9 does cause interference to radio or television reception, which
can be determined by disconnecting the RS-232 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 Patton
Technical Support.

1

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 Service at [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 222N9. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

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 Service at [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 222N9. Technical Service hours: 8AM to 5PM EST, Monday

through Friday.

2

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

• Conforms to EIA RS-422 Standard

• Bi-directional data conversion

• Data Rates to 19.2 Kbps over two twisted pair

• No AC power required–draws operating power from RS-232 signals

• Passes transmit and receive data–handshaking lines looped back

• Convenient thumb screws on DB-9 (female) interface

• Ultra-miniature size (2.50" x 1.20" x 0.75")

• Twisted pair connection via strain relief, RJ-11 or RJ-45

• Made in the USA

2.2 DESCRIPTION

The Patton Model 222N9 RS-232 (EIA-574) to RS-422 interface
converter allows asynchronous PCs, terminals and laptops employing

the EIA-574 (RS-232/ DB-9) interface to communicate with devices
using RS-422 balanced electrical signals. Facilitating bi-directional
data conversion over two twisted pair, the Model 222N9 draws all
necessary operating power from data and control voltages on the EIA­574 interface. The Model 222N9 supports data rates to 19.2 Kbps and
distances to 4000 feet. All control signals are looped back at the EIA­574 interface.

The Model 222N9 is housed in an ultra-miniature ABS plastic
enclosure measuring 2.5”L x 1.2” H x .75” W. Options for twisted pair
connection on the RS-422 side include terminal block with strain relief,
RJ-11 and RJ-45. The EIA-574 side is available with a choice of male
or female DB-9 connector.

The surge protected Model 222N9S uses high speed avalanche
diodes to intercept data line transient surges and shunt them safely to
chassis ground. Compliant with IEC 801.5 level 2, 1kV, the 222N9S
can protect itself and connected equipment from nearby lightning
strikes, and other surges of electromagnetic radiation.

3

The Model 222N9 is easy to install and requires no pre-
configuration. This section tells you how to properly connect the Model
222N9 to the RS-422 (twisted pair) and EIA-574 (DB-9) interfaces, and
how to operate the Model 222N9.

3.1 CONNECTION TO THE RS-422 INTERFACE

The Model 222N9 supports data-only communication distances up
to 4000 feet between itself and the RS-422 device. To function
properly, the Model 222N9
These pairs must be dry, unconditioned metallic wire, between 19 and
26 AWG (the higher number gauges may limit distance somewhat).

For your convenience, the Model 222N9 is available with several
different physical interfaces on the RS-422 side: RJ-11 jack, RJ-45
jack, and terminal blocks with strain relief.

3.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 222N9's twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:

RJ-1

1----------------GND* 1 --------------N/C
2----------------RCV- 2 --------------GND*
3----------------XMT+ 3 --------------RCV-
4----------------XMT- 4 --------------XMT+
5----------------RCV+ 5 --------------XMT-
6----------------GND* 6 --------------RCV+

* Connection to Ground is Optional

When connecting two Model 222N9s it is necessary to use a "cross
over" cable. The diagram below shows how a cross over cable should
be constructed for an environment where both Model 222N9s use a 6-
wire RJ-11 connector. Similar logic should be followed when using RJ-
45 connectors or a combination of the two.

3.0 INSTALLATION

The Model 222N9 is easy to install and requires no pre­configuration. This section tells you how to properly connect the Model
222N9 to the RS-422 (twisted pair) and EIA-574 (DB-9) interfaces, and
how to operate the Model 222N9.

3.1 CONNECTION TO THE RS-422 INTERFACE

The Model 222N9 supports data-only communication distances up
to 4000 feet between itself and the RS-422 device. To function
properly, the Model 222N9

must

have two twisted pairs of metallic wire.
These pairs must be dry, unconditioned metallic wire, between 19 and
26 AWG (the higher number gauges may limit distance somewhat).

For your convenience, the Model 222N9 is available with several
different physical interfaces on the RS-422 side: RJ-11 jack, RJ-45
jack, and terminal blocks with strain relief.

3.1.1 TWISTED PAIR CONNECTION USING RJ-11 OR RJ-45

The RJ-11 and RJ-45 connectors on the Model 222N9's twisted pair
interface are pre-wired for a standard TELCO wiring environment. The
signal/pin relationships are shown below:

RJ-1

1 SIGNAL RJ-45 SIGNAL

1----------------GND* 1 --------------N/C
2----------------RCV- 2 --------------GND*
3----------------XMT+ 3 --------------RCV­4----------------XMT- 4 --------------XMT+
5----------------RCV+ 5 --------------XMT­6----------------GND* 6 --------------RCV+

7 --------------GND*
8 --------------N/C

* Connection to Ground is Optional

When connecting two Model 222N9s it is necessary to use a "cross
over" cable. The diagram below shows how a cross over cable should
be constructed for an environment where both Model 222N9s use a 6­wire RJ-11 connector. Similar logic should be followed when using RJ­45 connectors or a combination of the two.

4

SIGNAL PIN# PIN# SIGNAL

GND* 1 .........................6 GND

RCV- 2 .........................4 XMT-

XMT+ 3 .........................5 RCV+

XMT- 4 .........................2 RCV-

RCV+ 5 .........................3 XMT+

GND* 6 .........................1 GND

*Connection to Ground is Optional

3.1.2 TERMINAL BLOCK TWISTED PAIR CONNECTION

If your application requires you to connect one or two pairs of bare
wires to the Model 222N9, you will need to access the internal terminal
blocks. The instructions on the following pages will tell you how to
open the case, connect the bare wires to the terminal blocks, and
fasten the strain relief collar in place so that the wires won't pull loose.

Note: The terminal block configurations are different for the
222N9M (male) and 222N9F (female).

1. Open the unit by gently inserting a screw driver between the DB-9
connector and the lip of the plastic case (See below). You don't have to
worry about breaking the plastic, but be careful not to bend the D-sub
connector.

(Continued)

5

1
2
3
4
5
6

1
2
3
4
5
6
7
8

+- -+

XMT G RCV

+- -+

XMTGRCV

222N9M 222N9F

Once the unit has been opened, you will be able to see the

terminal block located at the rear of the PC board.

2. Strip the outer insulation from the twisted pairs about one inch

from the end.

3. Strip back the insulation on each of the 2 twisted pair wires

about .25".

4. Connect
and negative) on the terminal block, making careful note of which color
is positive, and which color is negative.

Once the unit has been opened, you will be able to see the

terminal block located at the rear of the PC board.

2. Strip the outer insulation from the twisted pairs about one inch

from the end.

3. Strip back the insulation on each of the 2 twisted pair wires

about .25".

4. Connect

one pair

of wires to XMT+ and XMT- (transmit positive
and negative) on the terminal block, making careful note of which color
is positive, and which color is negative.

6

5. Connect the

other pair

of wires to RCV+ and RCV- (receive
positive and negative) on the terminal block, again making careful note
of which color is positive, and which color is negative.

Ultimately, you will want to construct a two pair cross over cable that

makes a connection with the RS-422 device as shown below:

Model

222N9 RS-422 Device

XMT+.............................RCV+

XMT-..............................RCV-

RCV+.............................XMT+

RCV-..............................XMT-

6. If there is a shield around the telephone cable, it may be
connected to "G" on the terminal block. We recommend connecting the
shield at the computer end only to avoid ground loops. A ground wire is

not necessary

for proper operation of the Model 222N9.

7. When you finish connecting the wires to the terminal block, the
assembly should resemble the diagram below:

8. Place the 2 halves of the strain relief assembly on either side of
the telephone wire and press together very lightly. Slide the assembly
so that it is about 2 inches from the terminal posts and press together
firmly. If your cable diameter is too small or too large for our strain
relief, please contact our technical support. We have strain relief
assemblies to accommodate most cable diameters.

(Continued)

7

9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and seat it into the
recess in the case. (If the telephone wire is too thin to be held by the
strain relief assembly, you will need to order a different sized strain
relief. Call Patton's Sales Department at [phone].)

10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.

11. Insert one captive screw through a saddle washer and then
insert the captive screw with the washer on it, through the hole in the
DB-25 end of the case. Snap that side of the case closed. Repeat the
process for the other side. This completes the cable installation
process.

9. Insert the strain relief assembly with the wire going through it
into the slot in the bottom half of the modem case and seat it into the
recess in the case. (If the telephone wire is too thin to be held by the
strain relief assembly, you will need to order a different sized strain
relief. Call Patton's Sales Department at [phone].)

10. BEND the top half of the case as necessary to place it over the
strain relief assembly. Do not snap the case together yet.

11. Insert one captive screw through a saddle washer and then
insert the captive screw with the washer on it, through the hole in the
DB-25 end of the case. Snap that side of the case closed. Repeat the
process for the other side. This completes the cable installation
process.

+RCV- G -XMT+

+RCV- G -XMT+

8

Transmission Format: Asynchronous

Data Rate: 0 to 19,200 bps (no strapping)

Control Signal: CTS (Pin 8) turns ON immediately after the

Transmit Line: 4 wire, unconditioned line (2 twisted pairs)

Transmit Mode: Full Duplex, 4-wire

Transmit Level: 0 dBm

Line Connection: RJ-11 or RJ-45 jack or 5 screw terminal

Power Supply: None required, uses ultra low power from

Surge Protection: Compliant with IEC 801.5 level 2, 1kV

Size: 2.50" x 1.2" x .75"

3.2 CONNECTION TO THE EIA-574 (RS-232) INTERFACE

The Model 222N9 is configured as a DCE, and is wired according

to the EIA-574 standard.

EIA-574 Standard

DB-9

SIGNAL

3---------------------TD
2---------------------RD
7---------------------RTS
8---------------------CTS
1---------------------CD
4---------------------DTR
6---------------------DSR
5---------------------SG/FG

Due to its small size, the Model 222N9 is able to plug directly into
the serial port of your EIA-574 DTE device (PC, laptop, etc.). If you
must use a cable to connect the Model 222N9 to the DTE device, make
sure that it is a

straight through

cable of the shortest possible

length—we recommend 6 ft or less.

3.3 OPERATING THE MODEL 222N9

Once the Model 222N9 is properly installed, it should operate
transparently—as if it were a standard cable connection. Operating
power is derived from the EIA-574 data and control signals; there is no
"ON/OFF" switch. All data from the EIA-574 interface, including
X-ON/X-OFF flow control information, is passed straight through. Any
hardware flow control signals are looped back at the interface and are
not passed between the short hauls.

9

APPENDIX A

PATTON MODEL 222N9 SPECIFICATIONS

Transmission Format: Asynchronous

Data Rate: 0 to 19,200 bps (no strapping)

Control Signal: CTS (Pin 8) turns ON immediately after the

terminal raises RTS (Pin 7). DSR (Pin 6)
and DCD (Pin 1) turn ON immediately after
the terminal raises DTR (Pin 4).

Transmit Line: 4 wire, unconditioned line (2 twisted pairs)

Transmit Mode: Full Duplex, 4-wire

Transmit Level: 0 dBm

Line Connection: RJ-11 or RJ-45 jack or 5 screw terminal

posts (4 wires and 1 ground) and a strain
relief insert. Works well with data signals
only.

Power Supply: None required, uses ultra low power from

EIA data and control signals

Surge Protection: Compliant with IEC 801.5 level 2, 1kV

(Model 222N9S Only)

Size: 2.50" x 1.2" x .75"

10

APPENDIX B

PATTON MODEL 222N9 CABLE RECOMMENDATIONS

The Patton Model 222N operates at frequencies of 20kHz or less
and has been performance tested by Patton technicians using twisted­pair cable with the following characteristics:

W

ire Gauge Capacitance Resistance

19 AWG/.9mm 83nf/mi or 15.72 pf/ft. .0163 Ohms/ft.
22 AWG/.6mm 83nf/mi or 15.72 pf/ft. .0326 Ohms/ft.
24 AWG/.5mm 83nf/mi or 15.72 pf/ft. .05165 Ohms/ft.

To gain optimum performance from the Model 222N, please keep
the following guidelines in mind:

•

Always

use twisted pair wire—this is not an option.

• Use twisted pair wire with a capacitance of 20pf/ft or less.

• Avoid twisted pair wire thinner than 26 AWG (i.e. avoid higher
AWG numbers than 26)

• Use of twisted pair with a resistance greater than the above
specifications may cause a reduction in maximum distance
obtainable. Functionality should not be affected.

• Environmental factors too numerous to mention can affect the
maximum distances obtainable at a particular site. Use “maximum
distance” figures as a general guideline only

.

11

NOTE: Signals XMT+ and XMT- are the EIA=422 “A” and “B” transmitters, respectively;
Signals RCV+ and RCV- are the EIA-422 “A” and “B” receivers, respectively.

DCE

DTE

DCE

DCE

Signal/Voltage

Source

APPENDIX C

PATTON MODEL 222N9 PIN ASSIGNMENTS

EIA-574 (RS-232) Interface

(DB-9 Connector)

EIA-422 Interface

(RJ-11 Female Connector)

EIA-422 Interface

(RJ-45 Female Connector)

NOTE: Signals XMT+ and XMT- are the EIA=422 “A” and “B” transmitters, respectively;

Signals RCV+ and RCV- are the EIA-422 “A” and “B” receivers, respectively.

RJ-11 (6 Pin) SIGNAL/PIN #

1 - (G) Ground
2 -(RCV-) Receive Data +
3 -(XMT+) Transmit Data ­4 -(XMT-) Transmit Data ­5 -(RCV+) Receive Data +
6 - (G) Ground

RJ-45 (8 Pin) SIGNAL/PIN #

1 - no connection
2 - (G) Ground
3 - (RCV-) Receive Data ­4 - (XMT+) Transmit Data +
5 - (XMT-) Transmit Data ­6 - (RCV+) Receive Data +
7 - (G) Ground
8 - no connection

1 Receive Line Signal Detector

2 Received Data

3 Transmitted Data

4 Data Terminal Ready

5 Ground/common Return

DCE

DTE

DCE

DCE

DCE

DCE

DTE

DTE

Common

Data Set Ready 6

Request To Send 7

Clear To Send 8

Ring Indicator 9

Signal/Voltage

Source

Signal Designations Signal Designations

Signal/Voltage

Source

EIA-574 Interface

12

APPENDIX D

PATTON MODEL 222N9 BLOCK DIAGRAM

13

Dear Valued Customer,

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

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.

following ways to tell us how you like this product and how we can meet your
product needs today and in the future.

Electronics is ISO 9001 certified. We meet and exceed the highest standards
in the industry (CE, UL, etc.).

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

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

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.
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
_______________________________________________________________
____________________________________________________________

CERTIFIED

An ISO-9001

Certified Company

Copyright © 1997

Patton Electronics Company

All Rights Reserved