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When installing your wireless transmitter it is important 

to position your device in such a way as to optimize 

the antenna location with what’s known as the “Fresnel 

Zone”.

Fresnel Zone

No co-location with other radio transmitters is 

allowed. By definition, co-location is when another 

radio device or its antenna is located within 20 

cm of your receiver/transmitter and can transmit 

simultaneously with your unit.

Multiple Transmitters

When using one transmitter with one receiver, there is 

no need to change the channel number. However, one 

receiver can communicate with multiple transmitters (up 

to 12) one at a time by changing the channel number of 

the receiver module to match the transmitter module. So 

if there are five transmitters, they should be configured 

to channels 1 thru 5.
Then the receiver can be set to channel 1 to communicate 

with transmitter #1, or channel 2 to communicate with 

transmitter #2, and so on and so forth. 

Maximizing 

Transmission

 Range

Position your receiver in a central location. 

When multiple transmitter are in operation, position 

your receiver unit in a central space if possible in equal 

distance to each wireless transmitter.
Move your system components higher off the floor and 

away from exterior walls. Avoid installing your system 

components too close to the floor or near your building’s 

exterior walls. The closer your transmitter and receiver 

unit are the greater the interference and loss of signal 

strength will be.
Maintain a line of sight between transmitter/receiver. 

Maintaining a clear line of sight between your 

transmitter and receiver unit will produce improved 

signal strength over a system that has obstacles blocking 

it. 

ARTWORK/PRODUCT ART/

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ARTWORK/PRODUCT ART/

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WRS232-USB

Universal Wireless RS232 

to USB Receiver,  

WRS232 Wireless Transmitter, 

WUSB Wireless Receiver

WARRANTY/DISCLAIMER

OMEGA ENGINEERING, INC. warrants this unit to be free of defects 

in materials and workmanship for a period of 

13 months

 from 

date of purchase. OMEGA’s WARRANTY adds an additional one (1) 

month grace period to the normal 

one (1) year product warranty

 

to cover handling and shipping time. This ensures that OMEGA’s 

customers receive maximum coverage on each product. 
If the unit malfunctions, it must be returned to the factory for 

evaluation. OMEGA’s Customer Service Department will issue an 

Authorized Return (AR) number immediately upon phone or written 

request. Upon examination by OMEGA, if the unit is found to be 

defective, it will be repaired or replaced at no charge. OMEGA’s 

WARRANTY does not apply to defects resulting from any action of 

the purchaser, including but not limited to mishandling, improper 

interfacing, operation outside of design limits, improper repair, 

or unauthorized modification. This WARRANTY is VOID if the unit 

shows evidence of having been tampered with or shows evidence of 

having been damaged as a result of excessive corrosion; or current, 

heat, moisture or vibration; improper specification; misapplication; 

misuse or other operating conditions outside of OMEGA’s control. 

Components in which wear is not warranted, include but are not 

limited to contact points, fuses, and triacs.

OMEGA is pleased to offer suggestions on the use of its various 

products. However, OMEGA neither assumes responsibility for 

any omissions or errors nor assumes liability for any damages 

that result from the use if its products in accordance with 

information provided by OMEGA, either verbal or written. 

OMEGA warrants only that the parts manufactured by the 

company will be as specified and free of defects. OMEGA 

MAKES NO OTHER WARRANTIES OR REPRESENTATIONS OF 

ANY KIND WHATSOEVER, EXPRESSED OR IMPLIED, EXCEPT 

THAT OF TITLE, AND ALL IMPLIED WARRANTIES INCLUDING 

ANY WARRANTY OF MERCHANTABILITY AND FITNESS 

FOR A PARTICULAR PURPOSE ARE HEREBY DISCLAIMED. 

LIMITATION OF LIABILITY: The remedies of purchaser set forth 

herein are exclusive, and the total liability of OMEGA with 

respect to this order, whether based on contract, warranty, 

negligence, indemnification, strict liability or otherwise, 

shall not exceed the purchase price of the component upon 

which liability is based. In no event shall OMEGA be liable for 

consequential, incidental or special damages. 

CONDITIONS: Equipment sold by OMEGA is not intended to be used, 

nor shall it be used: (1) as a “Basic Component” under 10 CFR 21 (NRC), 

used in or with any nuclear installation or activity; or (2) in medical 

applications or used on humans. Should any Product(s) be used in or 

with any nuclear installation or activity, medical application, used on 

humans, or misused in any way, OMEGA assumes no responsibility 

as set forth in our basic WARRANTY/DISCLAIMER language, and, 

additionally, purchaser will indemnify OMEGA and hold OMEGA 

harmless from any liability or damage whatsoever arising out of the use 

of the Product(s) in such a manner.

RETURN REQUESTS/INQUIRIES

Direct all warranty and repair requests/inquiries to the OMEGA 

Customer Service Department.  BEFORE RETURNING ANY 

PRODUCT(S) TO OMEGA, PURCHASER MUST OBTAIN AN 

AUTHORIZED RETURN (AR) NUMBER FROM OMEGA’S CUSTOMER 

SERVICE DEPARTMENT (IN ORDER TO AVOID PROCESSING 

DELAYS). The assigned AR number should then be marked on the 

outside of the return package and on any correspondence.
FOR 

WARRANTY

 RETURNS, 

please have the following 

information available BEFORE 

contacting OMEGA:
1. Purchase Order number under 

  which the product was  

 PURCHASED, 

2. Model and serial number of    

  the product under warranty, and 

3. Repair instructions and/or    

  specific problems relative to 

  the product.

FOR 

NON-WARRANTY

 REPAIRS, 

consult OMEGA for current repair 

charges. Have the following 

information available BEFORE 

contacting OMEGA:
1.  Purchase Order number to 

 cover 

  the COST of the repair or  

 calibration,

2.  Model and serial number of the 

  product, and 

3.   Repair instructions and/or specific 

problems relative to the product.

OMEGA’s policy is to make running changes, not model changes, 

whenever an improvement is possible. This affords our customers 

the latest in technology and engineering.
OMEGA is a registered trademark of OMEGA ENGINEERING, INC.
© Copyright 2013 OMEGA ENGINEERING, INC. All rights reserved.  

This document may not be copied, photocopied, reproduced, 

translated, or reduced to any electronic medium or machine-readable 

form, in whole or in part, without the prior written consent of OMEGA 

ENGINEERING, INC.

MQS4588/1013

RS232 Cable Connections

RJ12 to DB9 connector (female)
RJ12 Pin # 

DB9 Pin #

Normal (Config) 
3 RX (TX) 

2 RX

4 TX (RX) 

3 TX

5 GND 

5 GND

1 Power 

–––––

Specifications 

Wireless Transmitter, WRS232-USB

Operating  

0 to 50ºC (32 to 122ºF) 

Ambient 

0 to 95% Relative  

 

Conditions: 

Humidity (Non-Condensing)

Device Interface:   RS232
RS232 Cable:  

RJ12 to DB9 connector (Female)

RS232 

9600 BPS, 8 Bits of Data,  

Communication:

  1 Stop Bit, No Parity

RF Transmitter  ISM 2.4 GHz, Direct sequence  

Carrier: 

spread spectrum, License free  

 

 

world wide

RF Data Packet  IEEE 802.15.4 open   

Standard: 

communication architecture

RF Output Power: 10 dBm (10 mW)
RF Range: 

Up to 40 m (130') indoor/urban 

 

 Up to 120 m (400') outdoor/line of 

sight

Supply Voltage:   External 9 Vdc, or Powered thru RJ12 

connection

Supply Current:  60 mA
AC Adapter: 

 100-240 Vac, 50-60 Hz, UL, CE, FCC 

marked

   Output Voltage: 9 Vdc @ 1.7A 

   Output Plug: 

  Center positive, coax 2.0/5.5/10 mm

Enclosure: 

ABS Plastic, Bone color

Dimensions:  

70 x 51 x 20 mm (2.75" x 2" x 0.80")

Weight:  

60 g

For complete product manual:  

www.omega.com/manuals/manualpdf/M4588.pdf

WUSB WIRELESS RECEIVER

WRS232 WIRELESS TRANSMITTER

FRESNEL ZONE

TRANSMITTER

RECEIVER

NOTE:

omega.com   [email protected]

®

Servicing North America:

U.S.A.:

 

OMEGA Engineering, Inc., One Omega Dr. 

 

P.O. Box 4047, Stamford, CT 06905-0047 USA 

 

 Toll-Free: 1-800-826-6342 (USA & Canada Only) 

Customer Service: 1-800-622-2378 (USA & Canada Only)  

Engineering Service: 1-800-872-9436 (USA & Canada Only) 

Tel: (203) 359-1660 

Fax: (203) 359-7700 

 

e-mail: [email protected]

For Other Locations Visit omega.com/worldwide

It is the policy of OMEGA Engineering, Inc. to comply with all worldwide safety 

and EMC/EMI regulations that apply. OMEGA is constantly pursuing certification of 

its products to the European New Approach Directives. OMEGA will add the CE  

mark to every appropriate device upon certification.
The information contained in this document is believed to be correct, but 

OMEGA accepts no liability for any errors it contains, and reserves the right to 

alter specifications without notice. 

WARNING: These products are not designed for use in, and should not be used  

for, human applications.

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