 |
|
RPM1
|
| The VHF Radio Packet Modem
(RPM1) is a low cost intelligent radio packet modem that enables
a two way radio network/link to be simply implemented between
a number of digital devices. The RPM1 uses addressable data
packets with error checking, packet acknowledgements and retransmissions
to achieve a reliable transparent wireless data link. Built
for ease of use and rapid installation, the serial interface
ensures direct connection to microprocessors or to RS232 port
via RS232 driver while remote configuration enables post installation
setup of the modem. |
Figure 1: RPM1-173.250-3 |
|
|
|
Features
- Addressable point-to-point
mode
- Point-to-Multipoint and broadcast modes
- Inverted RS232 interface at 5V or 3.3V CMOS level
- DTE speed 600-115200bps
- Overall throughput:
3.7kbps with ACK and
5.3kbps wothout
ACK
- Single 5V or 3.3V (10mW max.) supply
- Flow control - Hardware
(CTS), none
- Usable range over 1km
- Built-in command line
configuration
- Built-in RF link diagnostics
- Remote over-air unit
configuration
- Low operating current,
Auto standby mode
- Conforms to European
ETSI EN 300 220-3 and EN 301 489-3 (at 10mW)
- Conforms to Australian/New Zealand AS/NZS 4268:2003
(at 100mW)
- Dimensions - 39 X 23 X 15 mm
- Available as RPM1T transmitter and RPM1R receiver for
one way communication
|
|
|
Applications
- GPS (NMEA) position reporting
- Telemetry and telecontrol
- EPOS equipment, barcode scanners,
belt clip printers, stock control, job allocation
- Remote data acquisition system, data
loggers
- In-building environmental monitoring
and control system
- High-end security and alarm signalling
- Automated Monitoring and Control Systems
- Fleet management, vehicle data acquisition
|
| Evaluation Platform: SPM2/RPM
Evaluation Kit |
| |
 |
| |
INTRODUCTION
The RPM1 is a self-contained radio modem
module that requires only a simple antenna, 5V supply and
a serial I/O port on a host microcontroller or PC.
The module provides all the RF circuits
and processor intensive low level packet formatting and
packet recovery functions required to inter-connect any
number of devices with serial port in a radio network.
A continuous stream of serial
data downloaded by a Host microcontroller into the RPM1
serial receive buffer is transmitted by the RPM1's transceiver
and will "appear" in the serial buffer of the
addressed RPM1 within radio range.
Figure 2: Point to point wireless
link with RPM1 + Host microcontroller
|
|
| |
| 1. FUNCTIONAL DESCRIPTION |
|
The RPM1 is a connection oriented modem
module for sending and receiving serial data via an RF communications
link.
The RPM1 handles all necessary protocol
related functions of validation and retries to ensure error
free and uninterrupted data is sent over the communications
link. All data transfers between a pair of RPM1s are fully
acknowledged, thus preventing the loss of data. Bit coding
and checksums are used on the data packets to ensure the validity
of the received data at the remote end.
|
Figure 3: RPM1 block diagram |
| |
|
1.1 OPERATING STATES
The RPM1 has three normal operating states:
· SHUTDOWN
· STANDBY
· CONNECTED
SHUTDOWN
The SHUTDOWN state is entered by asserting the WAKE/DTR
input pin high (Vcc). It effectively forces the RPM1 into
a suspended state. No communications can be made with the
RPM1 in this state. WAKE/DTR
pin should be pulled Low by host or connected to 0V to Enable
the RPM1.
STANDBY
Immediately after power up and during normal operation, the
RPM1 will automatically enter standby mode where it is waiting
for a connection request from a remote RPM1 module.
While in this mode a remote connection request can be received
which will place the RPM1 into a connected state allowing
it to then start receiving data from the remote unit. The
connected host device can also send data to the RPM1 via the
serial interface which will force the module to send a connection
request to the remote RPM1 module, thus effectively setting
up a logical connection between two units and allowing data
to be transferred.
CONNECTED
On receipt of a connection request from a remote unit, the
RPM1 immediately enters a connected state. This effectively
allows the RPM1 modems to start sending and receiving data.
In-coming data is sent to the host via the serial port in
the same form as it was given to the remote RPM1 module.
|
|
| |
Figure 4: RPM1 transmitting data at
5.3kbps during ZMODEM file transfer to a remote RPM1 |
| |
|
2. The Host Interface
|
| 2.1
SIGNALS
The connection to the RPM is a full duplex serial interface
supporting baud rates from 600bps to 115200bps. Additional
control signals are provided to assist in flow control, configuration
and power saving in the RPM1.
|
| |
 Figure 3: Physical
dimensions and pinouts |
| |
|
Pin name
|
Pin
|
Pin function
|
Input /Output
|
Description |
| RF GND |
1, 3 |
RF signal ground |
- |
BNC casing/coax braid
connection |
| RF |
2 |
RF signal |
In/Out |
Antenna pin/coax
core connection |
| RF SELECT |
4 |
Receiver Select |
In/Out |
Internal RF Receiver Enable
to BiM1 or RF Receiver Active Indicator |
| TX SELECT |
5 |
Transmitter Select |
In/Out |
Internal RF Transmitter
Enable to BiM1 or RF Transmitter Active Indicator |
| TXD/AF |
7 |
Transmitted Data or demodulated
signal |
In/Out |
Transmitted Packetised
Data to BiM1
Analogue Demodulated signal from BiM1 |
| D3 |
8 |
FRPC Data line |
NC |
Internal data line between
RPM and FRPC |
| D2 |
9 |
FRPC Data
line |
NC |
Internal data
line between RPM and FRPC |
| SIGNAL |
10 |
Preamble Detect |
Out |
Valid preamble indicator |
| RST |
11 |
FRPC reset |
NC |
Resets FRPC
which also isolates BiM1 |
| RXA |
12 |
Receive Acknowledge |
NC |
RPM to FRPC download request
acknowledge |
| RXR |
13 |
Receive Request |
Out |
Valid Data packet indicator |
| RESET |
14 |
Reset |
In |
Hardware reset of the
RPM1 |
| SETUP |
15 |
Enter Setup |
In |
Enter RPM1 configurator
after a RESET |
| WAKE/DTR |
16 |
Wake or Shutdown |
In |
Wakes RPM1 when low, shuts
down when high |
| TXD |
17 |
Serial transmitted data |
In |
Host (DTE) to RPM1 serial
transmit data |
| RXD |
18 |
Serial Received data |
Out |
RPM1 to host (DTE) serial
received data |
| CTS |
19 |
Clear to Send |
Out |
Hardware flow control
of data from host (DTE) |
| DEFAULT |
20 |
Force 9600bps |
In |
Force the RPM1 serial
interface to 9600bps |
| Vcc |
21 |
Vcc Supply |
In |
+5VDC or +3.3VDC |
| GND |
6, 22 |
Ground |
- |
Supply Ground internally
connected to RF GND |
| |
|
| Notes: |
1. RXD/TXD lines are true
data |
| |
2. Active low SETUP, DEFAULT
inputs require external 10kW pullup
to VCC |
| |
3. Logic levels are 5V
CMOS unless 3.3V variant is used |
| |
4. WAKE pin
should be pulled to ground if DTE cannot provide DTR signal |
| |
5. TXSELECT,
RXSELECT, SIGNAL, RXR, CTS can be connected to LEDs via
1kW series resistors |
|
|
| |
| 2.2
RADIO PACKET MODEM RESET
RESET
The Reset signal is internally pulled up to Vcc via a 10kW
resistor. A reset aborts any transfers in progress and restarts
the RPM1.
HOST DRIVEN RESET
Minimum low time: 1.0 ms, after
reset is released (returned high). The host should allow a
delay of 1ms after reset for the RPM1 to initialise itself.
|
| |
| 2.3
HOST TO RADIO PACKET MODEM DATA TRANSFER
Data is transferred between the RPM1 and the HOST using an
asynchronous serial protocol. The default protocol settings
are 8 data bits, no parity and 1 stop bit (8n1). The baud
rate setting for the serial interface is user settable from
600bps to 115200bps.
TXD
Data from the connected host is received by the RPM1 through
TXD pin.
CTS
A single handshake line, CTS, controls the flow of data into
the RPM1. The serial receive buffer of the RPM1 is 96 bytes
deep. The CTS will be asserted high (Vcc) by the RPM1 when
the receive buffer hits approximately 66% full. It is advisable
to limit the number of characters sent to the RPM1 after the
CST control line is asserted. This will help to reduce the
possibility of lost data due to internal buffer overruns in
the RPM1. The RPM1 will clear the CTS when the internal serial
receive buffer falls below 33% full.
RXD
Upon the RPM1 receiving data from a remote unit, the received
data is sent to the connected host device through the RXD
pin.
2.4 ENTERING RADIO PACKET MODEM CONFIGURATOR
Configuring the RPM1 is accomplished by using a built-in
command line configurator. The configurator is entered by
asserting the SETUP input of the RPM1 while resetting the
RPM1.
SETUP
Holding SETUP low during a reset cycle will force the modem
into the configurator. The state of this input is checked
while the RPM1 starts up from either power on or reset.
HOST DRIVEN SETUP
The Setup pin may either be driven by the host (recommended)
to enable host controlled configuration of the RPM1 or pulled
up to VCC via a suitable pull-up resistor (10kW).
2.5 FORCING DEFAULT SERIAL BAUD RATE
Asserting this pin low forces the RPM1 to startup with a
default baud rate of 9600bps, 8 data, one stop and not parity.
DEFAULT
During a RESET the HOST must hold DEFAULT low to force the
RPM1 serial interface to default to 9600bps. This is ideal
if the serial baud rate has been forgotten or incorrectly
set.
HOST DRIVEN DEFAULT
The DEFAULT pin may either be driven by the host (recommended)
or pulled up to VCC via a suitable pull-up resistor (10kW).
2.6 FORCING RADIO PACKET MODEM INTO SLEEP
MODE
Asserting the WAKE input high forces the modem into a low
power sleep mode. This effectively shuts down the RPM1 and
prevents it from sending or receiving any data. It is a method
for conserving power when the modem is not required.
WAKE/DTR
During normal operation WAKE pin can be pulled high to force
the RPM1 to shutdown into low power sleep mode.
HOST DRIVEN WAKE
The WAKE pin may either be driven by the host (recommended)
or pulled low to 0V.
|
|
| |
| TECHNICAL SPECIFICATIONS
|
| General |
|
| Operating Voltage |
5VDC or 3.3VDC |
| Operating Current |
|
| ACKMODDE
ON (100mW) |
|
| Transmitting |
Average 62mA
(Data streaming) |
| Receiving |
Average 27mA
(Data streaming) |
| ACKMODDE
ON (10mW) |
|
| Transmitting |
Average 32mA
(Data streaming) |
| Receiving |
Average 18mA
(Data streaming) |
| ACKMODDE
OFF (100mW) |
|
| Transmitting |
Average 86mA
(Data streaming) |
| Receiving |
Average 12mA
(Data streaming) |
| ACKMODDE
OFF (10mW) |
|
| Transmitting |
Average 42mA
(Data streaming) |
| Receiving |
Average 12mA
(Data streaming) |
| Auto
standby |
7mA (Waiting
for Connection) |
| Power
down |
1.2mA or 400mA
3 |
| |
|
| Standard
operating frequency |
151.300 MHz (100mW)
173.225MHz or 173.250MHz (10mW) |
| |
Other custom frequencies
between 120MHz-180MHz |
| Channel spacing |
25kHz |
| |
|
| Operating Temperature
|
-10ºC to +60ºC |
| Configuring options |
Built-in command line
configurator |
| |
|
| Interface |
|
| Serial Interface |
Inverted RS232 at 5V or
3.3 CMOS level |
| Serial Protocol |
8 data/1 stop/no parity |
| Serial Signals |
RXD, TXD, CTS, WAKE |
| Power down Control |
Via WAKE/DTR signal |
| Serial Handshaking |
Selectable as CTS signal
or none |
| DTE Interface
Speed |
600/1200/2400/4800/9600/19200/38400/57600/115200 |
| Air Interface Speed |
10kbps |
Overall throughput
|
|
|
Acknowledged
|
3.3kbps (max); 1.2kbps
(slots); 0.6kbps (slotsw) |
|
Unacknowledged4 |
5.3kbps (max); 1.2kbps
(slots); 0.6kbps (slotsw) |
| |
|
| Receiver |
|
| Sensitivity |
-115 dBm
for 1ppm BER |
| LO leakage
(conducted) |
-70dBm
|
| |
|
| Transmitter |
|
| Output Power |
+20dBm (100mW) ±1dB
(5V variant only)
+10dBm (10mW) |
| Spurious
Emissions |
AS/NZS 4268:2003 limits
(100mW variant)
EN 300 220-3 limits (10mW variant) |
|
| NOTES: |
- RPM1 uses BiM1 (10kbps VHF Narrow Band FM) transceiver
for its RF interface. Please refer to BiM1 data sheet for
further details on the RF specification.
- BiM1 (100mW/10mW) consumes 80mA/30mA on transmit and
8mA on receive
- RPM1 Issue 1 maintains compatibility with the SHDN OFF
feature in SPM2
RPM1 Issue 2 will shut the 1.280MHz oscillator down when
WAKE pin is pulled High to reduce power down current. SHDN
should be left as ON and WAKE pin should be pulled Low to
Enable RPM1.
- RPM1T transmitter and RPM1R receiver can only be used
with ACKMODE set to OFF
|
|
| |
| 3.0 RADIO
PACKET MODEM CONFIGURATION
3.1 ENTERING THE CONFIGURATOR
The RPM1 is configured by entering the built-in software
configurator. Current argument can be displayed by entering
parameter / command without argument
|
| |
| 3.2 USER CONFIGURABLE PARAMETERS |
| CONFIG |
Display a list of the current
RPM1 configuration.
This wil also set FLOW control to none
to enable simple 3 wire communication
|
| Valid range |
None |
| DEFAULT |
Set all RPM1 configuration
settings to their factory default values. |
| Valid range |
None |
| RESET |
Exit
the modem and force a software reset.
Any changed parameters will take effect after the modem
has restarted.
When exiting the configurator, the HOST device must ensure
the SETUP pin is high otherwise the configurator will
be re-entered after the reset. |
| Valid range |
None |
| UNIT |
Sets
the unit number.
Two RPM1 modules can communicate with each other provided
they have matching Unit numbers and Site codes. |
| default |
0 |
| Valid range |
0 to 15 |
| SITE |
Sets
the Site address.
The site number is used to distinguish between groups
of operating modems. The site code is an address extension
to the unit number. |
| default |
0 |
| valid range |
0 to 7 |
| ADDR |
Updates
the unit number value.
This command is used for changing the unit number in RAM
without updating the unit number stored in EEPROM. This
enables the RPM1 to support point-to-multipoint communications.
Upon using this command the configurator is exited and
the modem operation is resumed. The modem is not reset
when the configurator is exited. |
| Valid range |
0 to15 |
| BAUD |
Sets
the host interface baud rate.
The changed baud rate will take effect after resetting
the RPM1. |
| default |
9600 |
| valid range |
600, 1200, 2400, 4800,
9600, 19200, 38400, 57600, 115200 |
| THRUPUT |
Sets
the on-air data throughput.
Three possible settings are provided.
Max: sets the maximum data
throughput of the RPM1.
Slots: effectively reduces
the on-air throughput. This opens up 'time slots' allowing
other RPM1 pairs, operating within close proximity, equal
opportunity to transmit data.
Slotsw: increases the 'time
slots' even further to allow more RPM1 pairs to operate. |
| default |
max |
| valid range |
max, slots, slotsw |
| FLOW |
Sets
the serial flow control between the host and RPM1.
Using no flow control enables the RPM1 to be used with
a 3 wire serial link (TXD, RXD, GND). Care must be taken
in order to prevent overflowing the 96 byte serial receive
buffer in the RPM1.
Using hardware flow control enables the RPM1 to control
the flow of serial data being received. |
| default |
hw
|
| valid range |
hw, none |
| SERDLY |
Sets
the serial data receive to packet transmit delay.
When the RPM1 receives the first byte of data from the
host, it starts a timer running. Either a full buffer
of data to send or a timeout of this timer will allow
the packet to be transmitted.
Fine tuning this delay for the baud rate the RPM1 is operating
at can significantly increase throughput while reducing
unnecessary transmissions. |
| default |
2 (x10ms) |
| valid range |
2 to 255 (x10ms) |
| SHDN |
Sets
the action of the WAKE input.
Setting SHDN to ON will cause the RPM1 to monitor the
WAKE input. When WAKE is taken high the RPM1 will be forced
into low power sleep mode, thus reducing current consumption.
Subsequently lowering the WAKE input will bring the RPM1
out of low power sleep mode. |
| default |
on |
| valid range |
on, off |
| RETRY |
Sets
the number of data retry attempts.
RF interference can cause a transmitted data packet to
be lost or corrupt on reception. If this happens the RPM1
will retransmit any unacknowledged transfer. The transmission
will be retried the specified number of times before the
link to the remote unit is considered 'lost' and the data
purged. |
| default |
5 |
| valid range |
1 to 63 |
| STRTMSG |
Enables
the startup message.
The startup message is enabled by default, thus giving
an immediate indication of the operation of the RPM1.
The message can be disabled prior to deployment of the
RPM1 module. |
| default |
On |
| valid range |
on, off |
| ACKMODE |
Enables transfer acknowledgements.
This function enables packet transfer acknowledgements
to be returned for every outgoing packet. Packet acknowledgements
aid in the delivery of error free and consistent data
transfers between a pair of modems. Disabling the acknowledgements
results in higher data throughput between modems, but
does not protect against lost data due to RF interference.
It should be disabled while using RPM1 in a broadcast
mode. Do not set it to ON for RPM1T and RPM1R as they
cannot establish connection.
|
| default |
On |
| valid range |
on, off |
| REMOTE |
Enables
remote configuration.
Over-air remote configuration of a RPM1 module is possible
once it has been enabled. The remote command is used to
send remote configuration commands. See the following
chapter for a overview of remotely configuring a RPM1
module. |
| default |
Off |
| valid range |
on, off |
| RADAR |
Starts the radar test.
Used as a range or confidence test between RPM1 modules
within the same site.
|
| parameter |
Unit number between 0
and 15. |
|
|
| |
| To configure the
RPM1 the HyperTerminal should be set with the following settings. |
Figure 6: Serial Port settings to
use RPM1 Configurator |
| Hardware flow control should
be disabled. Default baud rate of the RPM1 is 9600bps. However
if the default baud rate of the RPM1 is changed then the baud
rate of the HyperTerminal should be matched or DEFAULT pin should
be pulled Low force the RPM1 baud rate to 9600bps. |
|
|
Figure 7: RPM1 configuration using
HyperTerminal |
| User configurable
parameters described in section 3.2 should be entered in the
command prompt > followed by Carriage Return (CR) key. Then
SETUP should be pulled-up to VCC and RPM1 should be RESET to
exit the configurator and for the new parameters to be used
by RPM1. |
|
| |
|
4.0 EXTENDED RADIO
PACKET MODEM FEATURES
4.1 THROUGHPUT
The RPM1 supports three rates, max (3.6kbps), slots (1.2kbps)
and slotsw (600bps), of over-air throughput
MAX: When set to maximum and
streaming data at the RPM1, the data is sent as quick as possible.
For host baud rates of 4800bps and above, data is transmitted
continuously with minimal delay between sequential packets.
When this occurs, there is effectively no airtime for another
pair, operating in close proximity, to transmit without causing
collisions. The maximum over-air throughput that can be achieved
is 3.6kbps with ACK and 5.4kbps without ACK.
|
Figure 8: RPM1 pair streaming data
without gap for another RPM1 pair |
| In Figure
8, RS232 serial data bytes accumulated in the receive buffer
is transmitted as two 10kbps bursts by transmitting RPM1 with
gaps just enough to receive ACK from receiving RPM1. |
| |
Figure 9: RPM1 pair streaming9600bps
serial data with ACK at maximum throughput |
| For continuous
data transmission at baud rates above 2400bps (with ACK) or
4800bps (without ACK), hardware flow control should be used
to prevent the host from causing receive buffer overrun errors.
RPM1 will signal CTS pin to stop/allow the host depending on
its Receiver Buffer level. |
|
| |
| SLOTS:
Setting the throughput to SLOTS provides a method of opening
'time slot' for other RPM1 pairs operating in close proximity.
The effective streaming on-air throughput between a pair of
RPM1 is effectively reduced to approximately 1200bps (with/without
ACK). |
Figure 10: RPM1 operating in slots
throughput mode |
| |
| SLOTSW:
This setting effectively widens the SLOTS, reducing the over-air
throughput to approximately 600bps (with/without ACK). It allows
more RPM1 pairs to share the same frequency. Host should obey
CTS flow control signal from RPM1 when using SLOTS or SLOTSW
mode. |
Figure 11: RPM1 operating in slotsw
throughput mode |
| Certain fast file
transfer protocols like ZMODEM are not suitable for SLOTSW mode.
KERMIT or similar protocol which tolerates wider time gaps between
packets should be used in this mode. |
|
| |
| 4.2
REMOTE CONFIGURATION
Remote configuration of a RPM1 module is possible using the
REMOTE command from within the configurator. The remote RPM1
unit should be on or in auto-standby mode.
Initially the REMOTE command is used to enable and disable
the ability to remotely configure a module, as described in
section 3.2: User Configurable Command.
Once remote configuration is enabled the REMOTE command is
then used to issue configuration commands to a remote RPM1.
The format for the remote command then becomes:
|
REMOTE <SERIAL NUMBER> <COMMAND> <PARAMETER>
|
The <SERIAL NUMBER> of the remote RPM1 must be known
in order for the remote configuration request to be executed
on the appropriate RPM1 module.
|
| |
The <COMMAND> to be executed can be any of the following:
|
Baud 600,1200,2400,4800,9600,19200,38400,57600,115200
Unit 0 to 15
Site 0 to 7
Shdn on/off
Flow hw/none
Serdly 2 to 255
Retry 1 to 63
Signon on/off
|
The <PARAMETER> is optional, and if not specified
the setting for that command is returned and displayed.
|
|
| |
| 4.3
POINT-TO-MULTIPOINT
The RPM1 can be used for point-to-multipoint communications.
One module must be considered to be the master, which is used
to address up to 15 remote units in any one site.
During normal operation, the base unit can be set to address
another unit dynamically by entering the configurator and
using the ADDR command to change the unit address. Upon execution
of this command, provided the parameters are correct, the
configurator is exited immediately. A period ('.') is sent
to the connected host device to indicate that the change has
been registered and the RPM1 is now ready for communications
to the new unit address.
ADDR is very similar to the Unit command, except that ADDR
does not update the stored EEPROM unit value. As the EEPROM
has a limited number of write cycles, using ADDR for addressing
multiple units in a point to multipoint network is recommended.
Also, the ADDR command will exit the configurator immediately,
which is requires to resume communications very quickly.
|
| |
| 4.4
BROADCAST MULTIDROP
The RPM1 has a broadcast mutidrop mode which provides a mechanism
for building a large networks. This mode of operation is determined
by the configuration command keyword ACKMODE being set to
OFF.
In broadcast mutidrop mode, the RPM1 does not implement network
layer functionality related to data packet routing, acknowledgement
and retries. The connected host device should provide network
layer functionality.
The site code and unit address is still used by the radio
modem when working in broadcast multidrop mode. For a given
multipoint network all radio modems within a group must contain
the same site code and unit address.
|
| |
| 4.5
RADAR: DIAGNOSTIC TEST
Built into the configurator is a diagnostic test suitable
for range testing and link confidence testing. The Radar test
effectively sends a small request packet to a remote unit
then waits for a reply. The remote unit must not be in the
configurator otherwise it will not respond.
Upon receipt of a positive response from the remote unit,
a success is recorded before the process is repeated. This
test will continue indefinitely until it is ended by a key
press.
|
| |
| 4.6
SpacePort Modem Error Handling
The RPM1's radio decoder module is deliberately non bit error
tolerant, i.e. no attempt is made to repair corrupt data bits.
All of the redundancy in the code is directed towards error
checking. For an FM radio link using short packet lengths,
packets are either 100% or so grossly corrupt as to be unrecoverable.
By the same reasoning, the Host is not informed or sent corrupt
data since corrupt information is of little value. The RPM1
implements packet acknowledges, timeouts and re-transmission
accomplish reliable error handling.
|
|
| |
| Ordering Information
|
RPM1 issue 2 will
be supplied as standard.
| Part
no. |
RF
output |
Supply |
| RPM1-151.300-3 |
100mW |
5V |
| RPM1-173.225-3 |
10mW |
5V |
| RPM1-173.250-3 |
10mW |
5V |
| RPM1-151.300-3-LP |
10mW |
5V |
| RPM1-151.300-3-LP-3V |
10mW |
3.3V |
| RPM1-173.225-3-HP |
100mW |
5V |
| RPM1-173.250-3-HP |
100mW |
5V |
| RPM1-173.225-3-3V |
10mW |
3.3V |
| RPM1-173.250-3-3V |
10mW |
3.3V |
Above RPM1 transceiver can also be ordered as separate RPM1T
transmitter and RPM1R receiver.
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| Appendix |
Figure 7: Example circuit
to make radio modem with DCE type RS232 interface
Click on the image for EXPANDED VIEW |
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Limitation of liability
The information furnished by Radiometrix
Ltd is believed to be accurate and reliable. Radiometrix Ltd
reserves the right to make changes or improvements in the
design, specification or manufacture of its subassembly products
without notice. Radiometrix Ltd does not assume any liability
arising from the application or use of any product or circuit
described herein, nor for any infringements of patents or
other rights of third parties which may result from the use
of its products. This data sheet neither states nor implies
warranty of any kind, including fitness for any particular
application. These radio devices may be subject to radio interference
and may not function as intended if interference is present.
We do NOT recommend their use for life critical applications.
The Intrastat commodity code for all our modules is: 8542
6000.
R&TTE Directive
After 7 April 2001 the manufacturer can
only place finished product on the market under the provisions
of the R&TTE Directive. Equipment within the scope of
the R&TTE Directive may demonstrate compliance to the
essential requirements specified in Article 3 of the Directive,
as appropriate to the particular equipment.
Further details are available on The Office of Communications
(Ofcom) web site:
Licensing
policy manual
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*** End of RPM1 data sheet
***
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Figure 3: Physical
dimensions and pinouts
Figure 7: Example circuit
to make radio modem with DCE type RS232 interface