Patton electronic 222NS, 222N User Manual

USER
MANUAL

MODEL 222N
and 222NS

Miniature RS-232 to
RS-422 Converters

CERTIFIED

An ISO-9001

Certified Company

Part #07M222N-C
Doc. #023022U, Rev. D
Revised 1/23/08

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

1.0 WARRANTY INFORMATION

Patton Electronics warrants all Model 222N 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 222N 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 222N 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 222N
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.

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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 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 222N. Technical Service 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

• Bi-directionally converts RS-232 signals to balanced RS-422

• DCE/DTE switch selectable on RS-232 interface

• Supports transmit and receive data (X-ON/X-OFF flow control)

• Loops back all handshaking signals on the RS-232 interface

• Very thin case (.75") for closely spaced computer ports

• No AC power or batteries required—draws all necessary operating
power from RS-232 interface

• Supports data rates to 19,200 bps

2.2 DESCRIPTION

The Patton Model 222N interface converter allows computers,

terminals and modems employing the RS-232E interface to
communicate with devices using RS-422 balanced electrical signals.
This unit derives the necessary power for operation from the data and
control voltages on the RS-232 interface. The 222N features
bi-directional data conversion at full or half duplex at distances up to 3.5
miles.

An external DCE/DTE switch lets you connect to the serial port of

either a computer/terminal (DTE) or a modem (DCE) without using a
crossover cable. The Model 222N is available with several RS-422
interface options: DB-25 male or female (following the RS-530
standard), RJ-11, RJ-45, or terminal blocks with strain relief.

The surge protected Model 222NS 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 222NS can
protect itself and connected equipment from nearby lightning strikes,
and other surges of electromagnetic radiation.

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3.0 CONFIGURATION

The Model 222N is designed to be easy to use. There are no
internal jumpers or DIP switches to set, so there is no need to open the
case to configure the unit (you may need to open the case for wire
connection—refer to section 4.0). The only configuration necessary for
operation is proper setting of the external DTE/DCE switch.

The figure below shows the location of the DTE/DCE switch on the
PC board, as well as the location of the terminal block and surge
suppressors ("S" model only).

DCE/DTE

Switch

Surge

Suppressors

(222NS only)

DCE DTE

Terminal

Block

3.1 SETTING THE DTE/DCE SWITCH

For your convenience, the Model 222N has an externally
accessible DTE/DCE switch (see diagram below). If the device
connected to the Model 222N is a modem or multiplexer (or is wired like
one), set the switch to "DTE". This setting causes the Model 222N to
behave like Data Terminal Equipment and transmit data on pin 2.

If the device connected to the Model 222N is a PC, terminal or host
computer (or is wired like one), set the switch to "DCE". This setting
causes the Model 222N to behave like Data Communications
Equipment and transmit data on pin 3.

DCE DTE

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4.0 INSTALLATION

Once you have properly configured the DTE/DCE switch, you are
ready to connect the Model 222N to your system. This section tells you
how to properly connect the Model 222N to the RS-422 and RS-232
interfaces, and how to operate the Model 222N.

4.1 CONNECTION TO THE RS-422 INTERFACE

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

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 222N is available with several
different physical interfaces on the RS-422 side: DB-25 (following the
RS-530 standard), RJ-11 jack, RJ-45 jack, and terminal blocks with
strain relief.

4.1.1 RS-422 CONNECTION USING THE DB-25

The DB-25 connector on the Model 222N's RS-422 side conforms to
the RS-530 interface standard (See Appendix C). When connecting to
an RS-422 device that also conforms to the RS-530 standard, your
cable should be "crossed over" in the manner shown below:

MODEL 222N RS-422 (530) DEVICE

SIGNAL

DB-25 PIN

†

DB-25 PIN SIGNAL

XMT+ 2............................3 RCV+

XMT- 14..........................16 RCV-

RCV+ 3............................2 XMT+

RCV- 16..........................14 XMT-

†

The DB-25 connector that is farthest from the DTE/DCE switch

NOTE: It is not necessary that the RS-422 device adhere to the RS-530
standard. However, you must make sure that the signals, polarities, and
pairing of your connection conform to the above diagram.

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