LPRS ERA900TRS User manual

eRA900TRS (PCB Rev 3.10)
Doc Version 1.0
easyRadio Advanced
User Guide
Modules Included:
• ERA900TRS
o 804MHz – 940MHz
CC ID: SLW-ERA9TRS
Low Power Radio Solutions Ltd
Doc Version 1.0
easyRadio Advanced
User Guide
Low Power Radio Solutions Ltd
Station Lane
Witney OXON
OX28 4BH
http://www.lprs.co.uk
Page 1 of 18
easyRadio Advanced

eRA900TRS (PCB Rev 3.10)
Doc Version 1.0
Table of Contents
Changes to this document
................................
Terms and Conditions of Use
................................
CC Warning Statement:
................................
Introduction to easyRadio Advanced
eatures: ................................
.......................
Basic Specifications
................................
ERA900TRS Transceiver Description
easyRadio Transceiver
................................
Block Diagram
................................
Physical Dimensions
................................
Pin Description (easyRadio mode)
Checklist ................................
............................
Application & Operation of a transceiver:
ERAx00TRS ................................
............................
Typical System Block Diagram
..........................
Absolute Maximum Ratings
................................
Performa
nce Data: ERAxxxTRS Supply +5.0 Volt
± 5%, Temperature 20° C
................................
ERA900TRS Channel requencies vs Bandwidth
Settings ................................
...............................
Low Power Radio Solutions Ltd
Doc Version 1.0
................................
.... 3
................................
3
................................
...... 4
Introduction to easyRadio Advanced
................... 5
.......................
5
................................
....... 5
..................... 6
................................
...... 6
................................
............... 6
................................
..... 6
Pin Description (easyRadio mode)
................... 7
............................
7
Application & Operation of a transceiver:
............................
9
..........................
9
................................
10
nce Data: ERAxxxTRS Supply +5.0 Volt
................................
10
ERA900TRS Channel requencies vs Bandwidth
...............................
11
easyRadio Configuration Command Set
RS232 Communication Settings
R Channel Settings
................................
RSSI
................................
RSSI Levels (804MHz –
940MHz)
PCB Layout
................................
Power Supply
................................
Antennas
................................
Product Order Codes
................................
easy-
Radio Advanced Module irmware Version
................................
................................
Document History
................................
Copyright
................................
Disclaimer
................................
Contact Information
................................
Low Power Radio Solutions Ltd
Station Lane
Witney OXON
OX28 4BH
http://www.lprs.co.uk
Page 2 of 18
easyRadio Configuration Command Set
............ 12
RS232 Communication Settings
................. 12
................................
... 13
................................
................................ 15
940MHz)
................... 15
................................
..................... 16
................................
................. 16
................................
........................ 16
................................
......... 16
Radio Advanced Module irmware Version
................................
........... 16
................................
.............. 17
................................
........................... 18
................................
.......................... 18
................................
.......... 18

eRA900TRS (PCB Rev 3.10)
Doc Version 1.0
Changes to this document
This data sheet has been updated to reflect firmware changes throughout the range of modules.
are recorded in the documentation history later in the document.
Terms and Conditions of Use
Low Power Radio Solutions Ltd
has an on
therefore reserve the r
ight to make changes without notice. The information contained in this data sheet is believed
to be accurate however
we do not assume any responsibility for errors or any liability arising from the application or
use of any product or circuit described her
including fitness for any particular application.
e
asyRadio modules are a component part of an end system product and should be treated as such. Testing to fitness is
the sole responsibi
lity of the manufacturer of the device into which easyRadio products are fitted, and is expected
BE ORE deployment into the field.
Any liability rom de ect or mal unction is limited to the replacement o product ONLY, and does not include labour
or other incurred corrective expenses.
Using or continuing to use these devices hereby binds the user to these terms.
Low Power Radio Solutions Ltd
Doc Version 1.0
Changes to this document
This data sheet has been updated to reflect firmware changes throughout the range of modules.
are recorded in the documentation history later in the document.
Terms and Conditions of Use
has an on
-
going policy to improve the performance and reliability of their products; we
ight to make changes without notice. The information contained in this data sheet is believed
we do not assume any responsibility for errors or any liability arising from the application or
use of any product or circuit described her
ein
. This data sheet neither states nor implies warranty of any kind,
including fitness for any particular application.
asyRadio modules are a component part of an end system product and should be treated as such. Testing to fitness is
lity of the manufacturer of the device into which easyRadio products are fitted, and is expected
Any liability rom de ect or mal unction is limited to the replacement o product ONLY, and does not include labour
Using or continuing to use these devices hereby binds the user to these terms.
Low Power Radio Solutions Ltd
Station Lane
Witney OXON
OX28 4BH
http://www.lprs.co.uk
Page 3 of 18
This data sheet has been updated to reflect firmware changes throughout the range of modules.
Specific alterations
going policy to improve the performance and reliability of their products; we
ight to make changes without notice. The information contained in this data sheet is believed
we do not assume any responsibility for errors or any liability arising from the application or
. This data sheet neither states nor implies warranty of any kind,
asyRadio modules are a component part of an end system product and should be treated as such. Testing to fitness is
lity of the manufacturer of the device into which easyRadio products are fitted, and is expected
Any liability rom de ect or mal unction is limited to the replacement o product ONLY, and does not include labour

easyRadio Advanced Radio Modules (Rev 3.6)
FCC Warning Statement:
•This
device complies with Part 15 of the CC Rules.
Operation is subject to the following two conditions:
(1) This device may
not cause harmful interference, and
(2)
This device must accept any interference received, including interference that may cause und
sired operation.
•
This equipment complies with CC radiation exposure limits set forth for an uncontrolled enviro
ment. End user
s must follow the specific operating instructions for satisfying R exposure compl
ance. This transmitter must not be co
transmitter. T
his device should not be used with antennas other than those
those of less or
equal gain to the maximum gain used in the table below.
•
Changes or modifications not expressly approved by the party responsible for compliance could
void the user’s authority to operate the equipment.
• Pin 1. Not suita
ble for use for CC compliance. or CC compliance, this pin MUST be cut off prior
to installation
Antennas Approved to use with ERA900TRS
Supplier
LPRS
LPRS
LPRS
Antennas must be used in conjunction with U L cable or
LPRS Part#: ARW-CAB-SMA-
UFL
easyRadio Advanced Radio Modules (Rev 3.6)
device complies with Part 15 of the CC Rules.
Operation is subject to the following two conditions:
not cause harmful interference, and
This device must accept any interference received, including interference that may cause und
This equipment complies with CC radiation exposure limits set forth for an uncontrolled enviro
s must follow the specific operating instructions for satisfying R exposure compl
ance. This transmitter must not be co
-
located or operated in conjunction with any other antenna or
his device should not be used with antennas other than those
equal gain to the maximum gain used in the table below.
Changes or modifications not expressly approved by the party responsible for compliance could
void the user’s authority to operate the equipment.
ble for use for CC compliance. or CC compliance, this pin MUST be cut off prior
Antennas Approved to use with ERA900TRS
Part Number
Gain
ANT900MS
3dBi
ANT
-
WP915SMA
-
Y
2.5dBi
ANT
-
RP915SMA
-
Y
2dBi
Antennas must be used in conjunction with U L cable or
equivalent:
UFL
-10
Page 4 of 18
This device must accept any interference received, including interference that may cause und
e-
This equipment complies with CC radiation exposure limits set forth for an uncontrolled enviro
n-
s must follow the specific operating instructions for satisfying R exposure compl
i-
located or operated in conjunction with any other antenna or
specified below or
Changes or modifications not expressly approved by the party responsible for compliance could
ble for use for CC compliance. or CC compliance, this pin MUST be cut off prior

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Introduction to easyRadio Advanced
easyRadio Advanced (ERA) modules extend on the
simplicity of previous easyRadio(02) modules by
incor
porating truly innovative features, including
the ability to change
bandwidth of the radio from
150
KHz down to 12.5KHz, which means narrow
band performance on a wide-
band budget.
Internal temperature measurement ensures less than
1.5KHz frequency drift fro
m ambient 20°C, over a range
of -
40°C to +85°C, as well as providing a usable
thermometer for the connected application accurate to
within 1°C.
Modes of transmission include an enhanced easyRadio
protocol with 16-
bit encryption and anti
software
, plus raw data modes where users can now use
self-
coding system which can be set to interface to any
other raw data module on ISM bands in both SK ( M)
and ASK (AM) modulation.
With the addition of three (total 4) separate data buffers,
data throughput has been m
assively improved by around
25% (Using equivalent BAUD rate).
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 5 of 18
Introduction to easyRadio Advanced
easyRadio Advanced (ERA) modules extend on the
simplicity of previous easyRadio(02) modules by
porating truly innovative features, including
bandwidth of the radio from
KHz down to 12.5KHz, which means narrow
-
band budget.
Internal temperature measurement ensures less than
m ambient 20°C, over a range
40°C to +85°C, as well as providing a usable
thermometer for the connected application accurate to
Modes of transmission include an enhanced easyRadio
bit encryption and anti
-cross talk
, plus raw data modes where users can now use
coding system which can be set to interface to any
other raw data module on ISM bands in both SK ( M)
With the addition of three (total 4) separate data buffers,
assively improved by around
Features:
•
A digital RSSI (Received Signal Strength Indication)
now reduces the requirement for the host to handle
A-
D measurement and can be called via a simple
command for
either the current RSSI level or the
signal strength of the last received data packet. This
value can also be delivered as the first BYTE in the
delivered packet.
•
Temporary channel/power level selection:
command
allows the user to scan other channels on
the fly without storing the settings in internal
EEPROM, therefore not reducing the life of the
EEPROM through repetitive modification.
•
ree flash firmware upgrades.
LPRS, new updates/features
programmed making a truly future proof solution.
Custom firmware can also be used (Contact LPRS for
details)
•Back compatibility with
easyRadio
modules.
•
Temperature compensation plus c
synthesiser for frequency acc
1KHz over full temperature range
•
Temperature sensor usable by host
Basic S ecifications
High sensitivity receiver
-107dBm @ 19.2 Kbps
-112dBm @ 4.8 Kbps
-117dBm @ 2.4 Kbps
Current
Receiver: 21mA
(Max)
Transmitter: 32mA
(Max)
User Programmable:
requency (Up to 132 channels)
Bandwidth (Down to 12.5KHz)
RS232 Data Rate 2.4Kbps –
115.2Kbps
Output Power (Up to 10dBm)
10mW
(ERA400TRS & ERA400TS)
5mW (ERA900TRS & ERA900TS)
Page 5 of 18
A digital RSSI (Received Signal Strength Indication)
now reduces the requirement for the host to handle
D measurement and can be called via a simple
either the current RSSI level or the
signal strength of the last received data packet. This
value can also be delivered as the first BYTE in the
Temporary channel/power level selection:
This
allows the user to scan other channels on
the fly without storing the settings in internal
EEPROM, therefore not reducing the life of the
EEPROM through repetitive modification.
ree flash firmware upgrades.
Using the tools from
LPRS, new updates/features
can be quickly
programmed making a truly future proof solution.
Custom firmware can also be used (Contact LPRS for
easyRadio
02 series
Temperature compensation plus c
rystal controlled
synthesiser for frequency acc
uracy less than +/-
1KHz over full temperature range
Temperature sensor usable by host
(Max)
(Max)
requency (Up to 132 channels)
Bandwidth (Down to 12.5KHz)
115.2Kbps
Output Power (Up to 10dBm)
(ERA400TRS & ERA400TS)
5mW (ERA900TRS & ERA900TS)

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
ERA900TRS
Transceiver Descri tion
The easy
Radio Transceiver is a complete sub
transceiver, a microcontroller and a
The Serial Data Input and Serial Data Output operate at the standard 19,200 Baud and the two
lines provide optional flow control to and from the host. The easyRadio Transceiver can accept and tran
mit up to 180 bytes of data, which it buffers internally before transmitting in an efficient over
mat.
Any other easyRadio Transce
iver within range and on the same channel that ‘hears’ the transmission will
decode the message and place the recovered data within a receive buffer that can then be downloaded to
the receiving host for processing and interpretation. Radio transmission and
duplex) i.e. transmit OR receive but not simultaneously.
Increased internal buffers however, allow the user to upload while a download is in progress giving an a
pearance of fully duplex data flow.
easyRadio Transceiver
Block Diagram
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 6 of 18
Transceiver Descri tion
Radio Transceiver is a complete sub
-
system that combines a high performance very low power R
transceiver, a microcontroller and a
voltage regulator.
The Serial Data Input and Serial Data Output operate at the standard 19,200 Baud and the two
lines provide optional flow control to and from the host. The easyRadio Transceiver can accept and tran
mit up to 180 bytes of data, which it buffers internally before transmitting in an efficient over
iver within range and on the same channel that ‘hears’ the transmission will
decode the message and place the recovered data within a receive buffer that can then be downloaded to
the receiving host for processing and interpretation. Radio transmission and
reception is bi
duplex) i.e. transmit OR receive but not simultaneously.
Increased internal buffers however, allow the user to upload while a download is in progress giving an a
Physical Dimensions
ERA400TRS
ERA900TRS
Pin Pitch 2.54mm
PCB Hole Size 1.0mm
1 2
38.0 mm
14.0 mm10.0 mm
15.24 mm
Page 6 of 18
system that combines a high performance very low power R
The Serial Data Input and Serial Data Output operate at the standard 19,200 Baud and the two
handshake
lines provide optional flow control to and from the host. The easyRadio Transceiver can accept and tran
s-
mit up to 180 bytes of data, which it buffers internally before transmitting in an efficient over
-air code for-
iver within range and on the same channel that ‘hears’ the transmission will
decode the message and place the recovered data within a receive buffer that can then be downloaded to
reception is bi
-directional (half
Increased internal buffers however, allow the user to upload while a download is in progress giving an a
p-
Physical Dimensions
ERA400TRS
ERA900TRS
Pin Pitch 2.54mm
PCB Hole Size 1.0mm
3 4 5 6 7 8 9
38.0 mm
15.24 mm
4.0 mm

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Pin Descri tion (
easyRadio
Pin No
Name
1
Antenna
2
R Ground
3
CD
4
Busy Output
5
Serial Data Out
6
Serial Data In
7
Host Ready Input
8
Vcc
9
Ground
Checklist
•
The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of
the input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications/performance
data).
•
The serial inputs and output
vice. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver module
may be permanently damaged by the voltages (+/
tion Circuit ( igure 11) for typical connection to an RS232 port via MAX232 interface IC.
•
The ‘Host Ready Input’ should be tied to 0 Volt (Ground) if not used,
abled.
•
Outputs will drive logic operating at 3.3 Volts and
at 5 Volts.
•
it 1K resistors in series with data lines if connecting to 5V logic.
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 7 of 18
easyRadio
mode)
Description
Antenna
50Ω R input/output.
Connect to suitable antenna.
or non USA ONLY. See notes.
R Ground
R ground. Connect to antenna
ground (coaxial cable screen
braid) and local ground plane.
Internally connected to other
Ground pins.
Carrier Detect
Busy Output
Digital Output to indicate that
transceiver is ready to receive
serial data from host.
Serial Data Out
Digital output for received data
to host
Serial Data In
Digital input for serial data to be
transmitted
Host Ready Input
Digital
Input to indicate that
Host is Ready to receive serial
data from transceiver
Positive supply pin. +2.5 to +5.5
Volts. This should be a ‘clean’
noise free supply with less than
25mV of ripple.
Connect to supply 0 Volt and
ground plane
The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of
the input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications/performance
The serial inputs and output
s are intended for connection to a UART or similar low voltage logic d
vice. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver module
may be permanently damaged by the voltages (+/
-
12V) present on RS232 signal lines. S
tion Circuit ( igure 11) for typical connection to an RS232 port via MAX232 interface IC.
The ‘Host Ready Input’ should be tied to 0 Volt (Ground) if not used,
only
when handshaking is e
Outputs will drive logic operating at 3.3 Volts and
inputs will be correctly driven by logic operating
it 1K resistors in series with data lines if connecting to 5V logic.
Page 7 of 18
Notes
or non USA ONLY. See notes.
Not suitable for use
for CC compliance.
or CC comliance,
this pin MUST be
cut off prior to in-
stallation
R ground. Connect to antenna
braid) and local ground plane.
Internally connected to other
rom V3.6.24
Digital Output to indicate that
transceiver is ready to receive
CTS function
Digital output for received data
Digital input for serial data to be
Host is Ready to receive serial
RTS function
Positive supply pin. +2.5 to +5.5
Volts. This should be a ‘clean’
noise free supply with less than
The module operates internally from an on board 3.3 Volt low drop regulator. The logic levels of
the input/output pins are therefore between 0 Volt and 3.3 Volts. (See specifications/performance
s are intended for connection to a UART or similar low voltage logic d
e-
vice. Do not connect any of the inputs or outputs directly to an RS232 port. The transceiver module
12V) present on RS232 signal lines. S
ee Applica-
tion Circuit ( igure 11) for typical connection to an RS232 port via MAX232 interface IC.
when handshaking is e
n-
inputs will be correctly driven by logic operating

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 8 of 18
Page 8 of 18

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
A lication & O eration
The diagram below
shows a typical system block diagram comprising hosts (user’s application) connected to
easyRadio
Transceivers. The hosts (A & B) will be monitoring (collecting data) and/or controlling (sending data) to
some real world application.
Easy-Radio
Transceiver
Host
(A)
Serial Data Input
Serial Data Output
Host Ready
Busy
Ty ical System Block Diagram
The hosts provide serial data input and output lines and two ‘handshaking’ lines that control the flow of data to and
from the easy
Radio Transceivers. The ‘Busy’ output line, when active, indicates that the transceiver is unde
internal task and is not ready to receive serial data. The ‘Host Ready’ input is used to indicate that the host is ready to
receive the data held in the buffer of the
The host should check before sending data that the ‘Bus
unable to reliably receive further data
. It should also pull the ‘Host Ready’ line low and check that no data appears on
the Serial Data Output line.
The busy output is active all the time
regardless of handshaking setting. The host ready is enabled by the handshaking
setting.
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 9 of 18
of a transceiver: ERAx00TRS
shows a typical system block diagram comprising hosts (user’s application) connected to
Transceivers. The hosts (A & B) will be monitoring (collecting data) and/or controlling (sending data) to
Easy-Radio
Transceiver
(A)
Easy-Radio
Transceiver
(B)
Serial Data Input
Serial Data Output
Host Ready
Busy
RF Link
Ty ical System Block Diagram
The hosts provide serial data input and output lines and two ‘handshaking’ lines that control the flow of data to and
Radio Transceivers. The ‘Busy’ output line, when active, indicates that the transceiver is unde
internal task and is not ready to receive serial data. The ‘Host Ready’ input is used to indicate that the host is ready to
receive the data held in the buffer of the
easyRadio Transceiver.
The host should check before sending data that the ‘Bus
y’ line is not high, as this would indicate that the transceiver is
. It should also pull the ‘Host Ready’ line low and check that no data appears on
regardless of handshaking setting. The host ready is enabled by the handshaking
Page 9 of 18
shows a typical system block diagram comprising hosts (user’s application) connected to
Transceivers. The hosts (A & B) will be monitoring (collecting data) and/or controlling (sending data) to
Host
(B)
Serial Data Input
Serial Data Output
Host Ready
Busy
The hosts provide serial data input and output lines and two ‘handshaking’ lines that control the flow of data to and
Radio Transceivers. The ‘Busy’ output line, when active, indicates that the transceiver is unde
rtaking an
internal task and is not ready to receive serial data. The ‘Host Ready’ input is used to indicate that the host is ready to
y’ line is not high, as this would indicate that the transceiver is
. It should also pull the ‘Host Ready’ line low and check that no data appears on
regardless of handshaking setting. The host ready is enabled by the handshaking

eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Absolute Maximum Ratings
Operating Temperature Range
Storage Temperature Range
Vcc
All Other Pins (N.B.)
Antenna
Performance Data: ERA
xxx
DC Parameters
Pin
Min
Supply Voltage (Vcc)
8
2.5
Transmit supply
current 8
Receive supply cu
r-
rent 8
Sleep Mode current
8
Inter ace Levels
Min
Data Output Logic 1
Data Output Logic 0
Logic Output Cu
r-
rent
Data Input Logic 1
2.0
Data Input Logic 0
Input Pull
-
ups
R Parameters
Pin
Min
Antenna Impedance
1
R requency
868
904
Transmitter
Pin
Min
R Power Output 1 -5
-5
requency accuracy
M deviation
( SK/G SK)
Harmonics/ Spur
i-
ous Emissions
Over Air Data rate
1200
eRA900TRS (PCB Rev 3.10) Doc Version 1.0
Page 10 of 18
Absolute Maximum Ratings
-
40° C to +85° C
-
40° C to +85° C
-
0.3 to + 6 Volts
-
0.3 to 3.3 Volts
50V p
-
p @ < 10MHz Must be insulated to prevent
damage from ESD
xxx
TRS
Su ly +5.0 Volt ± 5%, Tem erature 20° C
Typical
Max
Units
Notes
3.3
-
5.0
5.5
Volts
32 33 mA
21 mA
800
µ
A
4
Typical
Max
Units
Notes
3.1
Volts
10k load to +Vcc supply
0.1
Volts
10k load
25 mA
3.6
Volts
0.2
Volts
100
KΩ
1
Typical
Max
Units
Notes
50
Ohms
869.85
915
8
70
926
MHz
MHz
See ER Configuration
Command set
Typical
Max
Units
Notes
+5
-3
+5
-3
dBm
(869MHz)
dBm
(915MHz)
50Ω load
Depends on requency
±2
ppm
Overall
9.9
2.4
2.025
Khz
Khz
Khz
100KHz Spacing
25KHz Spacing
12.5KHz Spacing
-47 < -36 dBm
Meets EN 300 220
19200
38400
bps
Manchester Encoded
Page 10 of 18
p @ < 10MHz Must be insulated to prevent
Su ly +5.0 Volt ± 5%, Tem erature 20° C
Notes
Notes
10k load to +Vcc supply
10k load
to +Vcc supply
Notes
See ER Configuration
Command set
Notes
50Ω load
Depends on requency
Overall
100KHz Spacing
25KHz Spacing
12.5KHz Spacing
Meets EN 300 220
-3
Manchester Encoded