Linx Technologies MDEV-xxx-ES User Manual

ES Series

Master Development System

User's Guide

Warning: Some customers may want Linx radio frequency (“RF”)

!

products to control machinery or devices remotely, including machinery
or devices that can cause death, bodily injuries, and/or property
damage if improperly or inadvertently triggered, particularly in industrial
settings or other applications implicating life-safety concerns (“Life and
Property Safety Situations”).

Table of Contents

1 Introduction
2 Ordering Information
3 ES Series Transmitter Development Boarad

NO OEM LINX REMOTE CONTROL OR FUNCTION MODULE
SHOULD EVER BE USED IN LIFE AND PROPERTY SAFETY
SITUATIONS. No OEM Linx Remote Control or Function Module

should be modified for Life and Property Safety Situations. Such
modification cannot provide sufficient safety and will void the product’s
regulatory certification and warranty.

Customers may use our (non-Function) Modules, Antenna and
Connectors as part of other systems in Life Safety Situations, but
only with necessary and industry appropriate redundancies and
in compliance with applicable safety standards, including without
limitation, ANSI and NFPA standards. It is solely the responsibility
of any Linx customer who uses one or more of these products to
incorporate appropriate redundancies and safety standards for the Life
and Property Safety Situation application.

Do not use this or any Linx product to trigger an action directly
from the data line or RSSI lines without a protocol or encoder/
decoder to validate the data. Without validation, any signal from

another unrelated transmitter in the environment received by the
module could inadvertently trigger the action.

All RF products are susceptible to RF interference that can prevent
communication. RF products without frequency agility or hopping

implemented are more subject to interference. This module does not
have a frequency hopping protocol built in.

Do not use any Linx product over the limits in this data guide.
Excessive voltage or extended operation at the maximum voltage could
cause product failure. Exceeding the reflow temperature profile could
cause product failure which is not immediately evident.

4 ES Series Receiver Development Boarad
5 Using the Development Boards
5 Troubleshooting
6 The Prototyping Area
7 Using the Simplex Encoder / Decoder Section
7 Using the Data Squelch Circuit
8 Using the Encoder and Decoder
9 Range Testing
10 Host Interface Module
11 Master Development Software
11 About Antennas
12 Using the Boards as a Design Reference
12 In Closing
13 USB Host Interface Board Schematic
13 RS232 Host Interface Board Schematic
13 RF Section Schematic
14 Header Section Schematic
14 Squelch Circuit Schematic
14 Power Supply Section Schematic
15 Encoder/Decoder Section Schematic

Do not make any physical or electrical modifications to any Linx
product. This will void the warranty and regulatory and UL certifications

and may cause product failure which is not immediately evident.

ES Series Master Development System

User's Guide

Figure 1: ES Series Master Development System

Introduction

The Linx ES Series RF modules offer a simple, efficient and cost-effective
method of adding wireless communication capabilities to any product. The
Master Development System gives a designer all the tools necessary to
correctly and legally incorporate the ES Series into an end product. The
development boards serve several important functions:

• Rapid Module Evaluation: The boards allow the performance of the ES
Series modules to be quickly evaluated in a user’s environment.

• Range Testing: Using the on-board encoders and decoders to
generate a simplex transmission, a pair of development boards can be
used to evaluate the range performance of the modules.

• Design Benchmark: The boards provide a known benchmark against
which the performance of a custom design may be judged.

• Application Development: An onboard prototyping area allows for the
development of custom circuits directly on the development board. All
signal lines are available on a header for easy access.

• Protocol Development - The development system features a USB
or RS-232 interface board, which allows a designer to connect the
development board to a PC. Windows-based demonstration software
is also included, which allows for a variety of tests.

– –

1

Revised 3/18/2015

The Master Development System includes 2 development boards, one
set up for the transmitter and the other for the receiver, 2 ES Series
transmitters*, 2 ES Series receivers*, two CW Series antennas, 2 9V
batteries, demonstration software and full documentation.

*One part is soldered to the board, one extra for use on your first prototype board.

Ordering Information

Ordering Information

Part Number Description

MDEV-***-ES-USB ES Series Master Development System - USB

MDEV-***-ES-232 ES Series Master Development System - RS-232

*** = 869, 916MHz

Figure 2: Ordering Information

ES Series Transmitter Development Boarad

5

1

6

7

2

3

4

Figure 3: ES Series Transmitter Development Board

11

14

9

8

10

12

13

15

1. 9V Battery

2. DC Power Jack

3. On-Off Switch

4. Voltage Regulator

5. Host Interface Module

6. Prototype Area

7. Break-Out Header

8. ES Series Transmitter

9. RP-SMA Antenna Connector

10. MS Series Encoder

11. Baud Rate Selector Switches

12. MODE_IND LED

13. CREATE button

14. Buzzer Button (S3)

15. Relay Button (S2)

– – – –

2

3

ES Series Receiver Development Boarad

5

Using the Development Boards

All of the module’s connections are made available to the designer via the
wire-wrap header (TS1 / TS2). Jumper shunts have been provided. These

7

9

10

shunts are placed across adjacent pins to control the routing of TX and RX
data. After unpacking the development system, attach an antenna to each
board, install the supplied 9V battery, and turn on the power switches. The
development board is now ready for use.

1

2

4

3

Figure 4: ES Series Receiver Development Board

1. 9V Battery

2. DC Power Jack

3. On-Off Switch

4. Voltage Regulator

5. Host Interface Module

6. Prototype Area

7. Data Squelch Circuit

8. Break-Out Header

8

Troubleshooting

If the boards fail to work out of the box, then try the following:

13

11

14

16

• Check the battery to make sure it is not dead.

• Make sure that the antenna is connected.

• Make sure that the jumpers are set correctly.

6

12

15

• Ensure that the baud rate selector switches are set the same on both
boards.

• Create and learn a new address.

9. ES Series Receiver

10. RP-SMA Antenna Connector

If all of these appear to be in order, then you can call 800-736-6677 or
e-mail [email protected].

11. MS Series Decoder

12. Baud Rate Selector Switches

13. MODE_IND LED

14. LEARN Button

15. Buzzer

16. Relay Output

– – – –

4

5

The Prototyping Area

In addition to their evaluation functions, the boards may also be used
for actual product development. They feature a prototyping area for the
addition of application-specific circuitry. The prototyping area is the same
on both boards and contains a large area of plated through-holes so that
external circuitry can be placed on the board. The holes are set at 0.1" on
center with a 0.04" diameter, making it easy to add most industry-standard
SIP and DIP packages to the board. This circuitry can be interfaced with
the ES transmitter or receiver through the breakout header to the right. At
the bottom of this area is a row connected to the 5V power supply and at
the top is a row connected to ground.

Note: The on-board 5-volt regulator has approximately 500mA of

headroom available for additional circuitry. If added circuitry requires a
higher current, the user must add an additional regulator to the prototype
area or power the board from an external supply.

Ground Bus

Using the Simplex Encoder / Decoder Section

The transmitter board features an MS Series remote control encoder with
two push buttons and the receiver board features a decoder with a relay
output and a buzzer. When a button is pressed on the transmitter board,
the status of both buttons is captured and encoded into a data stream
for transmission. The data recovered by the receiver is decoded and the
decoder’s outputs are set to replicate the states of the encoder, driving
either the buzzer or the relay.

To activate this area of the board, the
module DATA line must be routed to
the encoder / decoder. Configure the
transmitter board for encoding and
transmission by placing a jumper across TX
DATA and ENCODER and across TX PDN
and PDN ENC on header TS1. Configure
the receiver board for reception and

TS1

PDN ENC
TX PDN
PDN RS232
TX RS232
TX DATA
TX ENCODER
/CLK
/CLK SEL
LO V DET
NC
GND

TX RX

decoding by placing a jumper across RX
DATA and DECODER on header TS2.

Figure 6: Jumper Configuration

Once the boards have been configured, place the receiver board on a flat
surface and turn it on. Turn on the transmitter board and press button S0.
You should hear the buzzer on the receiver board sound. Walk away from
the receiver to ascertain the useable range of the link in the environment.

TS2

SQ. DATA
NC
AUDIO REF
AUDIO
RSSI
RX DATA
RX DECODER
RX PDN

Regulator

+5 Volt Bus

Figure 5: The Development Board Prototyping Area

Button S1 activates the relay on the receiver board. The relay’s SPST
contacts can be connected at J2. Any device up to 5A at 30VDC / 120VAC
may be switched through the relay. An external siren or light can be
connected to aid range testing if the on-board buzzer is not loud enough.

Using the Data Squelch Circuit

A data squelch circuit is provided on the receiver development board.
This circuit is used to add both hysteresis and squelching capabilities as
detailed in the ES Series Receiver Data Guide. Since the ES Series receiver
output is not internally squelched, its output continually switches when no
transmission is present. This can cause interrupts and buffer overflows in
external circuitry. A squelch circuit helps eliminate this noise by providing
a qualification threshold for incoming data based on signal strength. This
circuit is not a substitute for robust protocol since squelch can be broken
by unintended interference.

– – – –

6

7

To get a better idea of the circuit’s operation, clip an oscilloscope probe on
both RX DATA and SQ. DATA (Squelch Data). With the transmitter off, the
SQ. DATA line is high (which means that the output is squelched) while RX
DATA is switching randomly. Squelching is accomplished by comparing
RSSI with a voltage reference created by R17 (potentiometer), R18, and
R21. When the RSSI falls below the voltage set by this reference, the
output of the comparator (U6) is pulled to ground. This disables the data
slicer created with the additional comparator contained within U6. Figure
14 shows the schematic of this circuit.

Setting a higher squelch threshold reduces the random noise on the DATA
line but also reduces range. The squelch level affects only the threshold of
the data going to the RS-232 serial port and the SQ DATA line on TS2.

To set squelch, turn off the transmitter and turn on the receiver. Place an
oscilloscope probe on the SQ DATA line, and adjust R17 until SQ DATA
remains high. Two resistors (R27 and R28) are used to connect the module
to the squelch circuit. These may be removed to disconnect the squelch
circuit and prevent it from slightly loading the AUDIO and AUDIO REF lines.

Using the Encoder and Decoder

The MS Series encoder and decoder use a 24-bit address to provide
uniqueness to the transmission and to prevent unintended activation.
The development boards come with a default address. To create a new
address, press and hold the CREATE button on the transmitter board.
The address is randomized for as long as the button is held down. Once
released, the MODE_IND LED begins flashing to indicate that the encoder
is ready to accept Control Permissions. Press the Buzzer and/or Relay
buttons to tell the encoder that they will be used. Press the Create button
again to exit Create Mode, or let the encoder time out after 15 seconds.

On the decoder board, press the LEARN button and the MODE_IND
LED begins flashing to indicate that the decoder is ready to learn a new
address. Press one of the authorized buttons on the transmitter board to
send a signal. Press the LEARN button again to exit Learn Mode, or let the
decoder time out after 17 seconds and the system is ready for use.

The encoder and decoder operate on one of four different baud rates as
set by the baud rate selector switches. A faster baud rate gives a faster
response time. Please see the encoder or decoder data guide for the
settings. If the switch is up then it is connected to Vcc, if it is down then it
is connected to GND.

Range Testing

Several complex mathematical models exist for determining path loss in
many environments. These models vary as the transmitter and receiver are
moved from indoor operation to outdoor operation. Although these models
can provide an estimation of range performance in the field, the most
reliable method is to simply perform range tests using the transmitter and
receiver in the intended operational environment.

Simple range testing can be performed with the transmitter and receiver
development boards. Pressing S0 on the transmitter activates the buzzer
on the receiver board, while S1 activates the relay.

As the maximum range of the link in an area is approached, it is not
uncommon for the signal to cut in and out as the transmitter moves. This
is normal and can result from other interfering sources or fluctuating signal
levels due to multipath. Multipath results in cancellation of the transmitted
signal as direct and reflected signals arrive at the receiver at differing times
and phases. The areas in which this occurs are commonly called “nulls”
and simply walking a little further usually restores the signal. If this does not
restore the signal, then the maximum effective range of the link has been
reached.

Since the evaluation boards are intended for use by design engineers,
they are not FCC certified. The transmitter has been set to approximate
legal limits by resistor R29 so that the range test results will approximate
the results from a well-designed, certified product. For applications where
Part 15 limits are not applicable or output levels can be legally raised due
to protocol duty cycle, R29 can be changed according to the attenuation
graph in the ES Series Transmitter Data Guide.

To achieve maximum range, keep objects such as your hand away from
the antenna and ensure that the antenna on the transmitter has a clear and
unobstructed line-of-sight path to the receiver board. Range performance
is determined by many interdependent factors. If the range you are able to
achieve is significantly less than specified by Linx for the products you are
testing, then there is likely a problem with either the board or the ambient
RF environment in which the board is operating. First, check the battery,
switch positions, and antenna connection. Next, measure the receiver’s
RSSI voltage with the transmitter turned off to determine if ambient
interference is present. If this fails to resolve the issue, please contact Linx
technical support.

– – – –

8

9

Host Interface Module

TS1

TX RX

TS2

SQ. DATA
NC
AUDIO REF
AUDIO
RSSI
RX DATA
RX DECODER
RX PDN

PDN ENC
TX PDN
PDN RS232
TX RS232
TX DATA
TX ENCODER
/CLK
/CLK SEL
LO V DET
NC
GND

The ES Master Development System
features a Host Interface socket, which
allows the use of two different PC interface
modules. The first is a USB interface
module that uses a standard USB cable to
connect to a PC’s USB port or a USB hub.
The second type of module is a RS-232
interface module that can be connected
to a standard serial COM port on a PC
using a straight-through 9-pin extension
cable (not included). The evaluation board
is considered a DCE device and as such
is designed to be connected using a
straight-thru serial extension cable. Do not
use a null-modem cable as the boards will
not function.

To install, select the module to be used
and then line up the pins on the module
with the headers on the board. Verify that the pin one polarity marks on the
board and on the Host Interface Module match. The USB jack or the D-sub
connector should face away from the board. Press firmly on the module so
that it slides fully into the header.

The development system may be prepared
for host operation with the supplied Linx
software by setting the jumpers on the
header as shown in the adjacent figure.
This routes the module’s data lines to
the Host Interface Module. Despite being
electrically interfaced, appropriate protocol
must be employed to ensure reliable and
error-free data transfer since the ES Series
modules do not encode or packetize the
data in any manner. It is important to understand that the development
boards are transparent; that is, the user’s software is entirely responsible
for controlling the timing and error correction aspects of the link. The
evaluation boards have no provision to check or qualify the incoming data.
When designing a protocol to transfer data across a wireless link, it is very
important to remember that interference is inevitable. The protocol must

Figure 7: USB Interface Module

Figure 8: RS-232 Interface Module

TS1

PDN ENC
TX PDN
PDN RS232
TX RS232
TX DATA
TX ENCODER
/CLK
/CLK SEL
LO V DET
NC
GND

TS2

SQ. DATA
NC
AUDIO REF
AUDIO
RSSI
RX DATA
RX DECODER
RX PDN

TX RX

Figure 9: Jumper Configuration

support error detection and correction if it is to be successful. A correctly
designed protocol will provide optimum performance and throughput for
product specific applications while taking into account the timing and
data-rate requirements of the module. For further information on protocol
considerations please refer to Application Note AN-00160.

If the designer needs to develop protocols using a physical implementation
other than an RS-232 or USB interface, the designer can build the custom
interface circuitry in the prototyping area and route the module’s data
signals from the header to the prototyping area.

Master Development Software

The development system is supplied with Windows-based software that
facilitates communication with the development boards through the Host
Interface Module. This software allows for testing and illustrates basic
implementation of the modules as a wireless serial link. The user selects
either a USB or RS-232 connection and whether the connected board is
the transmitter or receiver. The user can then send text, ASCII characters,
and even a picture. Documentation for the software may be found by going
to the ‘Help’ menu then ‘Help File’.

Terminal emulation programs, such as HyperTerminal, do not provide
error correction; therefore, bit errors or data line hashing are displayed as
random characters. Some form of error detection should be employed
when developing a protocol for wireless environments (please see
Application Note AN-00160).

About Antennas

The choice of antennas is one of the most critical and often overlooked
design considerations. The range, performance, and legality of an RF link
are critically dependent upon the type of antenna employed. Linx offers
a variety of antenna styles that can be considered for a design. Included
with the kit is a Linx CW Series connectorized whip antenna that should
be connected prior to using the kit. Despite the fact that the antenna is
not centered on the board’s ground plane, it exhibits a VSWR of <1.7 and
suitably demonstrates the module’s best practical performance.

– – – –

10

11

Using the Boards as a Design Reference

BZ1

BUZZER

B`4C5C`6GND

7

B3A`2A

1

E

11F`12F13

VCC

14

E`

10D9D`8

U5

CD4069UB HEX INVERTER

TX = NS

S0

BUZZER

VCC

GND

R0

100k

SEND

D0

0805_DIODE

RX = NS

RE1

RELAY-SPDT

1

2

J2

RELAY OUT

GND

C4

10uF

TX = NS

RF SECTION ENCODER/DECODER SECTION

USB HOST INTERFACE BOARD

89

RS232 HOST INTERFACE BOARD

USB HOST INTERFACE BOARD

89

J1

HIB-DIPMODULE

GND

GND

GND

GND

GND
NC
NC
NC
VCC
NC
NC
GND GND

DTR/PDN

RTS/TRSEL

TX DATA

RX DATA

NC

NC

GND

TX DATA

RX DATA

PDN

TRSEL

1
2
3
4
5

6
7
89

10

11

12

13

14

15

16

USBDP

USBDM

GND

DSR

DATA_IN

DATA_OUT

RTS

CTS

DTR

TX_IND

VCC

SUSP_IND

RX_IND

485_TX

RI

DCD

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

USB-B

GND

5V

DAT -

DAT+

GND

GSHD

GSHD

GNDGND

1

2

3

4

5

6

GND

SDM-USB-QS-S

J2

TX DATA

RX DATA

TRSEL

PDN

U1

The master development boards included in this kit are very simple, yet
they illustrate some important techniques that should be incorporated
into the board layout. The module’s mounting pads extend slightly past
the edge of the part. This eases hand assembly and allows for better
heat conduction under the part if rework is necessary. A full ground plane
fill is placed on the bottom of the board. This ground plane serves three
important purposes:

First, since a quarter-wave antenna is employed, the ground plane is
critical to serve as a counterpoise (please see Application Note AN-00500
“Antennas: Design, Application, and Performance” for details on how a
ground plane affects antenna function).

Second, a ground plane will suppress the transfer of noise between stages
of a product, as well as unintentional radiation of noise into free space.

Third, a ground plane allows for the implementation of a microstrip feed
between the module and the antenna. The term microstrip refers to a PCB
trace running over a ground plane that is designed to serve as a 50-ohm
transmission line. See the ES Series data guide or the calculator available
on our website for details on microstrip calculations.

USB Host Interface Board Schematic

USB-B

J2

GSHD

6

4

GND

3

DAT+

2

DAT -

GSHD

1

5V

5

GNDGND

U1

GND

1

2

3

GND

4

5

6

7

8

USBDP

USBDM

GND

VCC

SUSP_IND

RX_IND

TX_IND

485_TX

SDM-USB-QS-S

RI

DCD

DSR

DATA_IN

DATA_OUT

RTS

CTS

DTR

16

15

14

13

RX DATA

12

TX DATA

11

TRSEL

10

9

PDN

Figure 10: USB Host Interface Board Schematic

RS232 Host Interface Board Schematic

VCC

+

C2

4.7uF

16

GND
15
14
13
12

TX RS232

11
10

RX RS232

PDN

GND

TR SEL

1
6
2
7
3
8
4
9
5

GND

3.3uF

3.3uF

VCC

C1

+

3.3uF

+

C3

+

C4

C5

3.3uF

U1

MAX232

1

C1+
V+
C1-

T1OUT
C2+
C2-

R1OUT
V­T2OUT
R2IN R2OUT

VCC

GND

R1IN

T1IN
T2IN

2
3
4
5
6
7
89

+

GND

GND

GND

J2

RS-232

HIB-DIPMODULE

J1

1

GND

2

NC

3

NC

4

NC

5

VCC

6

NC

7

NC
GND GND

J1

1

GND

2

NC

3

NC

4

NC

5

VCC

VCC

6

NC

7

NC
GND GND

GND

HIB-DIPMODULE

GND

RX DATA

TX DATA

RTS/TRSEL

DTR/PDN

RX DATA
TX DATA

RTS/TRSEL

DTR/PDN

16

GND

15

NC

14

NC

13

RX DATA

12

TX DATA

11

TRSEL

10

PDN
GND

16

GNDGND

GND

15

NC

14

NC

13

RX RS232

12

TX RS232

11

TR SEL

10

PDN

GND

In Closing

Here at Linx, “Wireless Made Simple” is more than just our motto, it is our
commitment. A commitment to the highest caliber of product, service,
and support. That is why, should you have questions or encounter any
difficulties using the evaluation kit, you’ll be glad to know many resources
are available to assist you. First, check carefully for the obvious, then
visit our website at www.linxtechnologies.com or call [phone]
between 8AM and 4PM Pacific Time to speak with an application engineer.

Legal Notice: All Linx kits and modules are designed in keeping with

high engineering standards; however, it is the responsibility of the user to
ensure that the products are operated in a legal and appropriate manner.
The purchaser understands that legal operation may require additional
permits, approvals, or certifications prior to use, depending on the
country of operation.

– – – –

12

Figure 11: RS232 Host Interface Board Schematic

RF Section Schematic

RX = NS

R29

GND

22K

Figure 12: RF Section Schematic

VCC

TX PDN

R14

220 ohm
GND

TX DATA

1

2

3

4

U2

PDN

LADJ

VCC

LO_V_D

GND

/CLK SEL

DATA5/CLK

TXM-XXX-ES

ANT

GND

ANT1
CONREVSMA001

GND GND

2-5

RF

1

U3

GND

GND

VCC

1

ANT

2

GND

3

NC

4

GND

5

VCC

6

NC

7

NC

8

NC

PDN

RSSI

DATA

AUDIO

A REF

10

9

GND

8

LO V DET

7

/CLK SEL

6

/CLK

TX = NS

16

NC

15

NC

14

RX PDN

13

RSSI

12

RX DATA

11

AUDIO

10

AUDIO REF

9

NC

RXM-XXX-ES

13

Header Section Schematic

GND

100k

GND

100k

GND

100k

GND

100k

GND

BZ1

BUZZER

B`4C5C`6GND

7

B3A`2A

1

E

11F`12F13

VCC

14

E`

10D9D`8

U5

CD4069UB HEX INVERTER

C3

0.01uF

R15

100k

R16

10k

TX = NS

S0

BUZZER

VCC

GND

R0

100k

SEND

D0

0805_DIODE

RX = NS

RE1

RELAY-SPDT

1

2

J2

RELAY OUT

GND

GND

C4

10uF

TX = NS

S1

RELAY

VCC

GND

R1

100k

SEND

D1

0805_DIODE

RX = NS

RX DEC

VCC

SEND

R13

100k

GND

RX = NS

RX RS232 SQ

RX PDN

RSSI

RX DATA

AUDIO

AUDIO REF

VCC

GND

GND

ANT

1

GND

2

NC

3

GND

4

VCC

5

NC

6

NC

7

NC

8

NC

9

A REF

10

AUDIO

11

DATA

12

RSSI

13

PDN

14

NC

15

NC

16

U3

RXM-XXX-ES

TX = NS

TX PDN

TX DATA

LO V DET

/CLK SEL

/CLK

GND

GND

R14

220 ohm

VCC

PDN

1

LADJ

2

VCC

3

GND

4

DATA5/CLK

6

/CLK SEL

7

LO_V_D

8

GND

9

ANT

10

U2

TXM-XXX-ES

R29

22K

GND

RX = NS

RF

GND GND

1

2-5

ANT1
CONREVSMA001

RF SECTION ENCODER/DECODER SECTION

HEADER SECTION

RX DATA

AUDIO

RSSI

RX PDN

RX RS232 SQ

RX DEC

AUDIO REF

1
2
3
4
5
6
7
8
9

TS2

CON9

GND

TX = NS

VCC

VCC

11

12

13

14

15

16

17

18

19

20

GND

R7

100k

GND

R8

100k

GND

R9

100k

GND

R10

100k

GND

GND

BZ1

BUZZER

B`4C5C`6GND

7

B3A`2A

1

E

11F`12F13

VCC

14

E`

10D9D`8

U5

CD4069UB HEX INVERTER

C3

0.01uF

R15

100k

R16

10k

TX = NS

S0

BUZZER

VCC

GND

R0

100k

SEND

D0

0805_DIODE

RX = NS

RE1

RELAY-SPDT

1

2

J2

RELAY OUT

GND

GND

C4

10uF

TX = NS

S1

RELAY

VCC

GND

R1

100k

SEND

D1

0805_DIODE

RX = NS

S3

CREATE/LEARN

RX DEC

VCC

GND

R12

100k

SEND

R13

100k

GND

RX = NS

D_DATA_IN/E_SEND

D0

D1

VCC

VCC

D2

D3

D4

D5

TX = ENC

RX = DEC

VCC

GNDGND

GNDGND

TX RS232

RX RS232 SQ

GND

1

NC

2

NC

3

NC

4

VCC

5

NC

6

NC

7

GND

8

GND

9

DTR/PDN

10

RTS/TRSEL

11

TX DATA

12

RX DATA

13

NC

14

NC

15

GND

16

J3

HOST MODULE

PDN RS232

TX DATA

TX PDN

TX RS232

/CLK
TX ENC

/CLK SEL

GND

LO V DET

RX = NS

PDN RS232

PDN ENC

1
2
3
4
5
6
7
8

9
10
11

TS1

CON11

RX PDN

RSSI

RX DATA

AUDIO

AUDIO REF

VCC

GND

GND

ANT

1

GND

2

NC

3

GND

4

VCC

5

NC

6

NC

7

NC

8

NC

9

A REF

10

AUDIO

11

DATA

12

RSSI

13

PDN

14

NC

15

NC

16

U3

RXM-XXX-ES

TX = NS

TX PDN

TX DATA

LO V DET

/CLK SEL

/CLK

GND

GND

R14

220 ohm

VCC

PDN

1

LADJ

2

VCC

3

GND

4

DATA5/CLK

6

/CLK SEL

7

LO_V_D

8

GND

9

ANT

10

U2

TXM-XXX-ES

R29

22K

GND

RX = NS

RF

GND GND

1

2-5

ANT1
CONREVSMA001

RF SECTION ENCODER/DECODER SECTION

Host Interface HeaderProto Signal Header

HEADER SECTION

SQUELCH CIRCUIT

RX DATA

AUDIO

RSSI

RX PDN

RX RS232 SQ

RX DEC

AUDIO REF

1
2
3
4
5
6
7
8
9

TS2

CON9

GND

TX = NS

RX RS232 SQ

R26

10K

R25

10K

R23
10K

R24

2M

AUDIO REF

AUDIO

VCCVCC

R19

39K

R20
2M

R21
39K

C2

0.01uF

VCC

GND GND GND

R22

390K

OUTA

1

INA-

2

INA+

3

GND4INB+

5

INB-

6

OUTB

7

VCC

8

U6

LMV393

R28

0

R27

0

TX = NS

VCC

VCC

11

12

13

14

15

16

17

18

19

20

GND

R7

100k

GND

R8

100k

GND

R9

100k

GND

R10

100k

TX ENC

1

2

3

4

5

6

7

8

9

10

GND

R2

200

R4

100k

GND

R6

100k

GND

R5

100k

GND

GND

SW2

SEL_BAUD0

SW3

SEL_BAUD1

D2

MODE_IND

GND

BZ1

BUZZER

B`4C5C`6GND

7

B3A`2A

1

E

11F`12F13

VCC

14

E`

10D9D`8

U5

CD4069UB HEX INVERTER

C3

0.01uF

R15

100k

R16

10k

TX = NS

S0

BUZZER

VCC

GND

R0

100k

SEND

D0

0805_DIODE

RX = NS

RE1

RELAY-SPDT

1

2

J2

RELAY OUT

GND

GND

C4

10uF

TX = NS

S1

RELAY

VCC

GND

R1

100k

SEND

D1

0805_DIODE

RX = NS

S3

CREATE/LEARN

RX DEC

VCC

GND

R12

100k

SEND

R13

100k

GND

RX = NS

D6D7SEL_BAUD0

SEL_BAUD1

GND

GND

D_LATCH/E_GND

D_RX_CNTL/E_TX_CNTL

D_TX_ID/E_DATA_OUT

MODE_IND D_LEARN/E_CREATE

D_DATA_IN/E_SEND

D0

D1

VCC

VCC

D2

D3

D4

D5

U4

LICAL-ENC/DEC-MS

TX = ENC

RX = DEC

VCC

GNDGND

GNDGND

TX RS232

RX RS232 SQ

GND

1

NC

2

NC

3

NC

4

VCC

5

NC

6

NC

7

GND

8

GND

9

DTR/PDN

10

RTS/TRSEL

11

TX DATA

12

RX DATA

13

NC

14

NC

15

GND

16

J3

HOST MODULE

PDN RS232

1
2
3
4
5
6
7
8

9
10
11

TS1

CON11

RX PDN

RSSI

RX DATA

AUDIO

AUDIO REF

VCC

GND

GND

ANT

1

GND

2

NC

3

GND

4

VCC

5

NC

6

NC

7

NC

8

NC

9

A REF

10

AUDIO

11

DATA

12

RSSI

13

PDN

14

NC

15

NC

16

U3

RXM-XXX-ES

TX = NS

LO V DET

/CLK SEL

/CLK

GND

GND

R14

220 ohm

PDN

1

LADJ

2

VCC

3

GND

4

DATA5/CLK

6

/CLK SEL

7

LO_V_D

8

GND

9

ANT

10

U2

TXM-XXX-ES

RF

GND GND

1

2-5

ANT1
CONREVSMA001

RF SECTION ENCODER/DECODER SECTION

Host Interface HeaderProto Signal Header

POWER SUPPLY SECTION

HEADER SECTION

SQUELCH CIRCUIT

Encoder/Decoder Section Schematic

Figure 13: Header Section Schematic

Squelch Circuit Schematic

Figure 14: Squelch Circuit Schematic

Power Supply Section Schematic

Figure 15: Power Supply Section Schematic

RX = NS

LO V DET
/CLK SEL
/CLK
TX ENC
TX DATA
TX RS232
PDN RS232
TX PDN

PDN ENC

GND

R17

5K

RSSI
R18
10K

GND

TS1

1
2
3
4
5
6
7
8

9
10
11

CON11

VCC

R19

39K

PWRJACK

R20
2M

GND GND GND

J1

D11

DIODE400

RX PDN
RX DEC
RX DATA
RSSI
AUDIO
AUDIO REF

RX RS232 SQ

TX = NS

R21
39K

C2

0.01uF

GND

GND

GND

U6

1

OUTA

2

INA-

3

INA+
GND4INB+

LMV393

SW1

POWER SWITCH

B1
9V BATTERY

TS2

1
2
3
4
5
6

VCC

7
8
9

CON9

R22

390K

8

VCC

7

OUTB

6

INB-

5

1

– – – –

14

J3

1

GND

2

NC

3

NC

4

NC

5

VCC

6

NC

7

NC

8

GND

HOST MODULE

Host Interface HeaderProto Signal Header

VCCVCC

R23
10K

R24

2M

R25

10K

R26

10K

Vout

GND

2

3

U1
LM7805 5V REGULATOR

Vin

GND

GND

NC
NC

RX DATA

TX DATA

RTS/TRSEL

DTR/PDN

GND

RX RS232 SQ

R27

0

R28

0

VCC

+

C1
220uF

GND

16
15
14
13
12

TX RS232

11
10

PDN RS232

9

AUDIO REF

AUDIO

GNDGND

GNDGND

TX = NS

2
1

J2

Figure 16: Encoder/Decoder Section Schematic

RELAY OUT

VCC

RX = NS

GND

GND

GND

100k

100k

100k

R7

R8

R9

18

19

20

D3

D4

D5

D6D7SEL_BAUD0

U4

1

2

3

100k

100k

R6

R5

SW2

GND

GND

VCC

GND

100k

R10

17

D2

SEL_BAUD1

4

SEL_BAUD0

GND

RE1

S1

RELAY

D1

SEND

0805_DIODE

VCC

VCC

15

16

VCC

VCC

GND

GND

5

6

GND

GND

SW3

SEL_BAUD1

VCC

GND

VCC

S0

BUZZER

RX = NS

GND

RELAY-SPDT

C4

10uF

R1

100k

VCC

S3

12

13

14

D0

D1

D_DATA_IN/E_SEND

D_LATCH/E_GND

D_RX_CNTL/E_TX_CNTL

D_TX_ID/E_DATA_OUT

7

8

9

TX ENC

R3

100k

LATCH

GND

R0

100k

D0

SEND

0805_DIODE

TX = NS

GND

GND

SEND

RX DEC

CREATE/LEARN

R12

100k

11

TX = ENC

RX = DEC

GND

R2

MODE_IND D_LEARN/E_CREATE

LICAL-ENC/DEC-MS

D2

10

PDN ENC

100k

R4

GND

15

GND

GND

R13

100k

RX = NS

GND

200

MODE_IND

TX = NS

14

U5

1

R15

BZ1

BUZZER

11F`12F13

10D9D`8

E

R16

B3A`2A

10k

E`

B`4C5C`6GND

C3

0.01uF

7

CD4069UB HEX INVERTER

GND

VCC

100k

Linx Technologies

159 Ort Lane

Merlin, OR, US 97532

Phone: [phone]

Fax: [phone]

www.linxtechnologies.com

Disclaimer

Linx Technologies is continually striving to improve the quality and function of its products. For this reason, we
reserve the right to make changes to our products without notice. The information contained in this Data Guide
is believed to be accurate as of the time of publication. Specifications are based on representative lot samples.
Values may vary from lot-to-lot and are not guaranteed. “Typical” parameters can and do vary over lots and
application. Linx Technologies makes no guarantee, warranty, or representation regarding the suitability of any
product for use in any specific application. It is the customer’s responsibility to verify the suitability of the part for
the intended application. NO LINX PRODUCT IS INTENDED FOR USE IN ANY APPLICATION WHERE THE SAFETY

OF LIFE OR PROPERTY IS AT RISK.

Linx Technologies DISCLAIMS ALL WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
PURPOSE. IN NO EVENT SHALL LINX TECHNOLOGIES BE LIABLE FOR ANY OF CUSTOMER’S INCIDENTAL OR
CONSEQUENTIAL DAMAGES ARISING IN ANY WAY FROM ANY DEFECTIVE OR NON-CONFORMING PRODUCTS
OR FOR ANY OTHER BREACH OF CONTRACT BY LINX TECHNOLOGIES. The limitations on Linx Technologies’

liability are applicable to any and all claims or theories of recovery asserted by Customer, including, without
limitation, breach of contract, breach of warranty, strict liability, or negligence. Customer assumes all liability
(including, without limitation, liability for injury to person or property, economic loss, or business interruption) for
all claims, including claims from third parties, arising from the use of the Products. The Customer will indemnify,
defend, protect, and hold harmless Linx Technologies and its officers, employees, subsidiaries, affiliates,
distributors, and representatives from and against all claims, damages, actions, suits, proceedings, demands,
assessments, adjustments, costs, and expenses incurred by Linx Technologies as a result of or arising from any
Products sold by Linx Technologies to Customer. Under no conditions will Linx Technologies be responsible for
losses arising from the use or failure of the device in any application, other than the repair, replacement, or refund
limited to the original product purchase price. Devices described in this publication may contain proprietary,
patented, or copyrighted techniques, components, or materials. Under no circumstances shall any user be
conveyed any license or right to the use or ownership of such items.

©2015 Linx Technologies. All rights reserved.

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