 |
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
|
| If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
|
| Datasheet File OCR Text: |
| EW N Issue 1, 27 April 2007 Radiometrix Hartcran House, 231 Kenton Lane, Harrow, HA3 8RP, England Tel: +44 (0) 20 8909 9595, Fax: +44 (0) 20 8909 2233 RPM1 VHF Radio Packet Modem 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. Features point-toAddressable point-to-point Point-toPoint-to-Multipoint and broadcast modes Inverted RS232 interface at 5V or 3.3VCMOS level DTE speed 600-115200bps 600Overall throughput: 3.7kbps with ACK with 5.3kbps without ACK Single 5V or 3.3V (10mW max) supply Flow control - Hardware (CTS), None Usable range over 1km BuiltBuilt-in command line configuration BuiltBuilt-in RF link diagnostics overRemote over-air unit configuration current, Low operating current, Auto standby mode 220489Conforms 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: 39mm X 23mm X 15mm communication Available as RPM1T transmitter and RPM1R receiver for one way communication Figure 1: RPM1-173.250-3 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 InIn-building, environmental monitoring and control systems monitoring HighHigh-end security and alarm signalling Automated Monitoring and Control Systems Fleet management, vehicle data acquisition Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 1 INTRODUCTION The RPM1 is a self-contained Radio Packet 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 RPMS 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 Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 2 1.1 OPERATING STATES The RADIO PACKET MODEM 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. Communications cannot 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 Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 3 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 5: Physical dimensions and pinouts Pin name RF GND RF RXSELCT TX SELECT TXD/AF Pin 1, 3 2 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 6, 22 Pin Function RF signal ground RF signal Receiver Select Transmitter Select Transmitted Data or demodulated signal FRPC Data line FRPC Data line Preamble Detect FRPC reset Receive Acknowledge Receive Request Reset Enter Setup Wake or Shutdown Serial transmitted data Serial Received data Clear To Send Force 9600bps Vcc Supply Ground In/Out Input or Output Input or Output Input or Output Input or Output NC NC Output NC NC Output Input Input Input Input Output Output Input Input Description BNC casing/coax braid connection Antenna pin/coax core connection Internal RF Receiver Enable to BiM1 or RF Receiver Active Indicator Internal RF Transmitter Enable to BiM1 or RF Transmitter Active Indicator Transmitted Packetised Data to BiM1 Analogue Demodulated signal from BiM1 Internal data line between RPM and FRPC Internal data line between RPM and FRPC Valid preamble indicator Resets FRPC which also isolates BiM1 RPM to FRPC download Request Acknowledge Valid Data packet indicator Hardware reset of the RPM1 Enter RPM1 configurator after a RESET Wakes RPM1 when low, shuts down when high Host (DTE) to RPM1 serial transmit data RPM1 to host (DTE) serial received data Hardware flow control of data from host (DTE) Force the RPM1 serial interface to 9600bps +5VDC or +3.3VDC Supply Ground internally connected to RF GND D3 D2 SIGNAL RST RXA RXR RESET SETUP WAKE/DTR TXD RXD CTS DEFAULT VCC GND notes: 1. RXD/TXD lines are true data 2. Active low SETUP, DEFAULT inputs require external 10k pull-up 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 1k series resistors 2.2 RADIO PACKET MODEM RESET RESET The Reset signal is internally pulled up to Vcc via a 10k resistor. A reset aborts any transfers in progress and restarts the RPM1. HOST DRIVEN RESET Minimum low time: 1.0 s, after reset is released (returned high). The host should allow a delay 1ms after reset for the RPM1 to initialise itself. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 4 2.3 HOST TO RADIO PACKET MODE 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 (DTE) 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 CTS 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 (DTE) 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 (10k). 2.5 FORCING DEFAULT SERIAL BAUD RATE Asserting this pin low forces the RPM1 to start-up with a default baud rate of 9600bps, 8 data bits, one stop and no 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 (10k). 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. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 5 TECHNICAL SPECIFICATION General Operating Voltage Operating Current ACKMODE ON (100mW) Transmitting Receiving ACKMODE ON (10mW) Transmitting Receiving ACKMODE OFF (100mW) Transmitting Receiving ACKMODE OFF (10mW) Transmitting Receiving Auto-Standby Power-down Standard Operating frequency Channel spacing Operating Temperature Configuring options Interface Serial Interface Serial Protocol Serial Signals Power down Control Serial Handshaking DTE Interface Speed Air Interface Speed Overall throughput - Acknowledged - Unacknowledged4 5VDC or 3.3VDC Average 62mA (Data streaming) Average 27mA (Data streaming) Average 32mA (Data streaming) Average 18mA (Data streaming) Average 86mA (Data streaming) Average 12mA (Data streaming) Average 42mA (Data streaming) Average 12mA (Data streaming) 7mA (Waiting for Connection) 1.2mA or 400A 3 151.300MHz (100mW) 173.225MHz or 173.250MHz (10mW) Other custom frequencies between 120MHz-180MHz 25kHz -10C to +60C Built-in command line configurator Inverted RS232 at 5V or 3.3V CMOS level 8 data/1 stop/no parity RXD, TXD, CTS, WAKE Via WAKE/DTR signal Selectable as CTS signal or none 600/1200/2400/4800/9600/19200/38400/57600/115200 bps 10kbps 3.7kbps (max) 1.2kbps (slots) 0.6kbps (slotsw) 5.3kbps (max) 1.2kbps (slots) 0.6kbps (slotsw) -115dBm for 1ppm BER -70dBm +20dBm (100mW) 1dB (5V variant only) +10dBm (10mW) AS/NZS 4268:2003 limits (100mW variant) EN 300 220-3 limits (10mW variant) Receiver Sensitivity LO leakage (conducted) Transmitter Output Power Spurious Emissions Note: 1. 2. 3. 4. 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 VHF Narrow Band FM Radio Packet Modem page 6 Radiometrix Ltd. 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 Valid range DEFAULT Valid range RESET Display a list of the current RPM1 configuration. This will also set FLOW control to none to enable simple 3 wire serial communication None Set all RPM1 configuration settings to their factory default values. None 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. None Sets the unit number. Two RPM1 modules can communicate with each other provided they have matching Unit numbers and Site codes. 0 0 to 15 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. 0 0 to 7 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-tomultipoint 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. 0 0 to 15 Sets the host interface baud rate. The changed baud rate will take effect after resetting the RPM1. 9600 600, 1200, 2400, 4800, 9600, 19200, 38400, 57600, 115200 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. max max, slots, slotsw Valid range UNIT default Valid range SITE default valid range ADDR default Valid range BAUD default valid range THRUPUT default valid range Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 7 FLOW default valid range SERDLY 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. none hw, none 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. 2 (x10ms) 2 to 255 (x10ms) Sets the action of the WAKE input. Setting shutdown 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. SHDN should be set to OFF or WAKE pin should be pulled Low when the host (DTE) cannot provide DTR control signal to wake RPM1 in a 3-wire serial interface. Do not set it to OFF for RPM1 Issue 2. On on, off 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. 5 1 to 63 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. On on, off 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. On on, off 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. Off on, off Starts the radar test. Used as a range or confidence test between RPM1 modules within the same site. Unit number between 0 and 15. VHF Narrow Band FM Radio Packet Modem page 8 default valid range SHDN default valid range RETRY default valid range STRTMSG default valid range ACKMODE default valid range REMOTE default valid range RADAR parameter Radiometrix Ltd. 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. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 9 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. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 10 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. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 11 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 Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 12 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 Radio Packet 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 to accomplish reliable error handling. Ordering information RPM1 issue 2 will be supplied as default. Part number RPM1-151.300-3 RPM1-173.225-3 RPM1-173.250-3 RPM1-151.300-3-LP RPM1-151.300-3-LP-3V RPM1-173.225-3-HP RPM1-173.250-3-HP RPM1-173.225-3-3V RPM1-173.250-3-3V RF output 100mW 10mW 10mW 10mW 10mW 100mW 100mW 10mW 10mW Supply 5V 5V 5V 5V 3.3V 5V 5V 3.3V 3.3V Above RPM1 transceiver can also be ordered as separate RPM1T transmitter and RPM1R receiver. Radiometrix Ltd. VHF Narrow Band FM Radio Packet Modem page 13 Radiometrix Ltd. Appendix A VHF Narrow Band FM Radio Packet Modem Figure 7: Example circuit to make radio modem with DCE type RS232 interface page 14 Hartcran House 231 Kenton Lane Harrow, Middlesex HA3 8RP ENGLAND Tel: +44 (0) 20 8909 9595 Fax: +44 (0) 20 8909 2233 sales@radiometrix.com www.radiometrix.com Copyright notice This product data sheet is the original work and copyrighted property of Radiometrix Ltd. Reproduction in whole or in part must give clear acknowledgement to the copyright owner. Radiometrix Ltd 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: http://www.ofcom.org.uk/radiocomms/ifi/ Information Requests Ofcom Riverside House 2a Southwark Bridge Road London SE1 9HA Tel: +44 (0)845 456 3000 or 020 7981 3040 Fax: +44 (0)20 7783 4033 information.requests@ofcom.org.uk European Radiocommunications Office (ERO) Peblingehus Nansensgade 19 DK 1366 Copenhagen Tel. +45 33896300 Fax +45 33896330 ero@ero.dk www.ero.dk |
Price & Availability of RPM1-151300-3
 |
|
|
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
| [Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
|
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |