
INSTR, INST, DXS-21/ DXS-23,/DXS-25 
LINEAR P/N: 215593 B 
MATERIAL: 20 LB. MEAD BOND 
SIZE: 8.500"  X 11.000" 
INK: BLACK 
SCALE: 1-1
DXS-21 
DXS-23 
DXS-25
SUPERVISED 
HANDHELD 
TRANSMITTERS
Operation Instructions
PRODUCT DESCRIPTION
The DXS-21, DXS-23 and DXS-25 are supervised, digitally coded 
radio transmitters designed for use with Linear’s DX and DXS Format 
receivers. Pressing a button on the transmitter sends a digitally coded 
wireless signal to its companion receiver. 
To send a complete signal,
press the transmitter button for a minimum of 2 seconds.
The digital DXS code format features over a million possible codes. The 
DXS transmitters are precoded at the factory to unique codes, so no field 
coding is required. The multi-button transmitters send variations of their 
preset codes depending on which buttons are pressed. Transmitters can 
send a signal for up to 10 seconds per activation.
The transmitters are supervised for low battery and send hourly status 
reports. Some receivers are able to use these signals, others are not.
Receivers must be programmed to the transmitter code before system 
testing and operation. Refer to the receiver’s instructions for details 
on operation and programming.
Each transmitter is powered by two self-contained type 2032 3-volt 
lithium batteries (included). When the batteries voltage gets low, a low 
battery report is sent with any alarm or status report to notify the 
receiver. The red LED will blink when the transmitter is activated with 
low batteries.
A removable pocket clip and belt clip are provided for each transmitter. 
Either can be attached to the back of the transmitter allowing the unit 
to be clipped to shirt pocket or slid onto a belt.
The top button on each transmitter can be hidden with the top 
button cover supplied with each unit.
TRANSMITTER CONFIGURATIONS
DXS-21
The DXS-21 is a two-button, one-code transmitter. Pressing either the 
round button on the transmitter’s front, or the small button on the 
transmitter’s top will send the same signal.
DXS-23
The DXS-23 is a three-button, four-code transmitter. Pressing either 
of the transmitter’s front buttons sends codes one and two. Pressing 
the small button on the transmitter’s top sends code three. Pressing 
both front buttons 
together
 sends code four.
DXS-25
The DXS-25 is a five-button, eight-code transmitter. Pressing any of 
the transmitter’s front buttons sends codes one through four. Holding 
down the small button on the transmitter’s top together with pushing 
with any of the front buttons sends codes five through eight.
DXS-21 FEATURES DXS-23 FEATURES DXS-25 FEATURES
BATTERY REPLACEMENT POCKET & BELT CLIP/TOP BUTTON COVER LINEAR LIMITED WARRANTY
This Linear product is warranted against defects in material and workmanship for twelve 
(12) months. The War ranty Expiration Date is labeled on the product. 
This warranty
extends only to wholesale customers
 who buy direct from Linear or through Linear’s
normal distribution channels. 
Linear does not warrant this product to consumers.
Consumers should inquire from their selling dealer as to the nature of the dealer’s 
warranty, if any. 
There are no obligations or liabilities on the part of Linear 
Corporation for consequential damages arising out of or in connection with use 
or performance of this product or other indirect damages with respect to loss of 
property, revenue, or profit, or cost of removal, installation, or reinstallation. 
All 
implied warranties, including implied warranties for merchantability and implied 
warranties for fitness, are valid only until Warranty Expiration Date as labeled on the 
product. 
This Linear Corporation Warranty is in lieu of all other warranties express
or implied.
All products returned for warranty service require a Return Product 
Authorization Number (RPA#). Contact Linear Technical Service at 
1-800-421-1587 for an RPA# and other important details.
IMPORTANT !!!
Linear radio controls provide a reliable communications link and fill an important need 
in portable wireless signalling. However, there are some limitations which must be 
observed.
✶
For U.S. installations only: The radios are required to comply with FCC Rules and 
Regulations as Par t 15 devices. As s uch, they have limited transmitter power and 
therefore limited range.
✶
A receiver cannot respond to more than one transmitted signal at a time and may 
be blocked by radio signals that occur on or near their operating frequencies, 
regardless of code settings. 
✶
Changes or modifications to the device may void FCC compliance.
✶
Infrequently used radio links should be tested regularly to protect against 
undetected interference or fault.
✶
A general knowledge of radio and its vagaries should be gained prior to acting as 
a wholesale distributor or dealer, and these facts should be communicated to the 
ultimate users.
Copyright © 2001 Linear Corporation  215593 B
(760) 438-7000 • FAX (760) 438-7043
USA & Canada (800) 421-1587 & (800) 392-0123
Toll Free FAX (800) 468-1340
www.linearcorp.com
PRESS EITHER BUTTON 
TO SEND CODE 1
RED INDICATOR 
LIGHTS WHEN 
TRANSMITTING
PRESS BUTTONS FOR A 
MINIMUM OF 2 SECONDS
PRESS LEFT BUTTON FOR CODE 1 
PRESS RIGHT BUTTON FOR CODE 2
RED INDICATOR 
LIGHTS WHEN 
TRANSMITTING
PRESS TOP BUTTON 
FOR CODE 3
PRESS BOTH 
FRONT 
BUTTONS FOR 
CODE 4 
(FOR ADDED 
SECURITY)
PRESS BUTTONS FOR A 
MINIMUM OF 2 SECONDS
RED INDICATOR 
LIGHTS WHEN 
TRANSMITTING
USE TOP BUTTON AS "SHIFT" 
KEY, PRESS TO SELECT CODES 
5, 6, 7 & 8 WITH FRONT BUTTONS
PRESS FOR 
CODE 3 (& TOP 
FOR CODE 7)
PRESS FOR 
CODE 1 (& TOP 
FOR CODE 5)
PRESS FOR 
CODE 4 (& TOP 
FOR CODE 8)
PRESS FOR 
CODE 2 (& TOP 
FOR CODE 6)
PRESS BUTTONS FOR A 
MINIMUM OF 2 SECONDS
REMOVE BATTERY 
ACCESS SCREW
SWING BATTERY 
COMPARTMENT OPEN
FLIP 
TRANSMITTER 
OVER
REPLACE 
WITH TWO 
TYPE 2032 
BATTERIES
SIDE UP
PULL BATTERY 
PROTECTION 
STRIP OUT 
PRIOR TO USE
BELT 
CLIP
ATTACH WITH 
THREE SCREWS
POCKET 
CLIP
ATTACH WITH 
TWO SCREWS
REMOVE FOUR 
SCREWS TO 
OPEN CASE
REMOVE 
TOP BUTTON
REPLACE WITH 
COVER PLATE
INSTALLING TOP BUTTON COVER PLATE
INSTALLING TRANSMITTER CLIPS