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| EW N 05 August 2004 Radiometrix Hartcran House, Gibbs Couch, Watford, WD19 5EZ, England Tel: +44 (0) 20 8428 1220, Fax: +44 (0) 20 8428 1221 SPM2-433 UHF SpacePort Modem The SpacePort Modem (SPM) is a low cost highly integrated intelligent radio packet modem that enables a radio network/link to be simply implemented between a number of digital devices. The SPM uses addressable data packets with error checking, packet acknowledgements and retransmissions to achieve a reliable invisible 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 TTL level 600DTE speed 600-115200bps 1200Air data speed 1200-14400bps Single 5V or 3.3V supply Flow control - Hardware, None inUp to 200m outdoor & 50m in-door range BuiltBuilt-in command line configuration BuiltBuilt-in RF link diagnostics overRemote over-air unit configuration Low operating current, Auto standby mode Conforms 220489Conforms to ETSI EN 300 220-3 and EN 301 489-3 Dimensions - 23mm X 39mm X 6.5mm SPM2-433-28 Applications PDAs, organisers & laptops Telemetry and telecontrol Handheld / portable terminals EPOS equipment, barcode scanners, belt clip printers, stock control, job allocation allocation Remote data acquisition system, data loggers Audience response systems InIn-building, environmental monitoring and control systems HighHigh-end security and alarm signalling Restaurant ordering systems Fleet management, vehicle data acquisition vehicle acquisition Radiometrix Ltd, SpacePort Modem page 1 INTRODUCTION The SPM2 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 SPM serial receive buffer is transmitted by the SPM'S transceiver and will "appear" in the serial buffer of the addressed SPM within radio range. Transmit/Receive download download HOST upload SPM SPM upload HOST Figure 1: SPM + Host -controller side view 6.5mm Left top view RF GND 1 RF 2 RF GND 3 RX SELECT 4 TX SELECT 5 GND 6 TXD/AF 7 D3 8 D2 9 SIGNAL10 RST 11 side views Right 0889 ! 22 21 20 19 18 17 16 15 14 13 12 GND Vcc DEFAULT RXFLOW/CTS RXD TXD WAKE/DTR SETUP RESET RXR RXA 23 mm 36.5mm 39 mm recommended PCB hole size: 0.9 mm pin pitch: 2 mm Figure 2: Physical dimensions and pinouts Radiometrix Ltd, SpacePort Modem page 2 TECHNICAL SPECIFICATION General Operating Voltage Operating Current Transmitting/Receiving Standby/Power-down Operating frequency 5VDC Average 40mA (Data streaming) 15mA/400A Single channel 433.920 MHz To be released on 869.85MHz and 914.50MHz 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 - Unacknowledged Receiver Sensitivity LO leakage (conducted) Transmitter Output Power 2nd harmonics Approval European Standards -10C to +55C Built-in command line configurator Inverted RS232 at TTL level 8 data/1 stop/no parity RXD, TXD, CTS, WAKE Via WAKE signal Selectable as CTS signal or none 600/1200/2400/4800/9600/14400 19200/38400/57600/115200 bps 1200/2400/14400 bps 18kbps (max) for standard and 28kbps for fast variant 30kbps (max) for standard and 55kbps for fast variant -95 dBm for 1ppm BER and -90dBm for fast variant -70dBm 10mW ERP -46 dB ETSI EN 300-220-3 (radio) and ETSI EN 301 489-3 (EMC) Radiometrix Ltd, SpacePort Modem page 3 1. FUNCTIONAL DESCRIPTION The SPM is a connection oriented modem module for sending and receiving serial data via an RF communications link. The SPM 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 SPMS 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. 1.1 OPERATING STATES The SPACEPORT 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 SPM into a suspended state. Communications cannot be made with the SPM in this state. STANDBY Immediately after power up and during normal operation, the SPM will automatically enter standby mode where it is waiting for a connection request from a remote SPM module. While in this mode a remote connection request can be received which will place the SPM 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 SPM via the serial interface which will force the module to send a connection request to the remote SPM 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 SPM immediately enters a connected state. This effectively allows the SPM 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 SPM module. Radiometrix Ltd, SpacePort Modem page 4 2 THE HOST INTERFACE 2.1 SIGNALS The connection to the SPM 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 SPM. Figure 3 shows an overview of the interface signals to the SPM. 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 SP2 Data line SP2 Data line Preamble Detect FRPC reset Receive Acknowledge Receive Request Reset Enter Setup Wake or Shutdown Serial transmitted data Serial Received data Flow control 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 Manual RF Receiver Enable or RF Receiver Active Indicator Manual RF Transmitter Enable or RF Transmitter Active Indicator Transmitted Packetised Data to BiM2 Analogue Demodulated signal from BiM2 Internal data line between RPM and FRPC Internal data line between RPM and FRPC Valid preamble indicator Resets FRPC which also isolates BiM2 Host to FRPC download request acknowledge Valid Data packet indicator Hardware reset of the SPM Enter SPM configurator after a reset Wakes SPM when low, shuts down when high Host (DTE) to SPM serial data SPM to host (DTE) serial data SPM to Host (DTE) flow control Force the SPM serial interface to 9600bps +5VDC 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. The 4 input control lines are active low 3. Logic levels are 5V CMOS. See electrical specifications 4. Input control pins must be terminated, as pull-ups are not provided 5 Indicator outputs are active low which can be connected to LEDs 2.2 SPACEPORT RESET RESET The Reset signal may either be driven by the host (recommended) or pulled up to Vcc via a suitable resistor (10k). A reset aborts any transfers in progress and restarts the SPM. 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 SPM to initialise itself. SPACEPORT MODEM RXD TXD CTS/DSR WAKE/DTR SETUP DEFAULT RESET D0 D1 D2 D3 TXR TXA RXR RXA RST Host controller Radio Packet Modem (RPM) Fast Radio Packet Controller (FRPC) TX Select RX Select RXD TXD BiM2 UHF Transceiver SIGNAL Figure 3: Host to SPM connection Radiometrix Ltd, SpacePort Modem page 5 2.3 HOST TO SPACEPORT DATA TRANSFER Data is transferred between the SPM 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 SPM using TXD signal. CTS A single handshake line, CTS, controls the flow of data into the SPM. The serial receive buffer of the SPM is 96 bytes deep. The CTS will be asserted by the SPM when the receive buffer hits approximately 66% full. It is advisable to limit the number of characters sent to the SPM after the CTS control line is asserted. This will help to reduce the possibility of lost data due to internal buffer overruns in the SPM. The SPM will clear the CTS when the internal serial receive buffer falls below 33% full. RXD Upon the SPM receiving data from a remote unit, the received data is sent to the connected host device using the RXD signal. 2.4 ENTERING SPACEPORT MODEM CONFIGURATOR Configuring the SPM is accomplished by using a built-in command line configurator. The configurator is entered by asserting the SETUP input of the SPM while resetting the SPM. SETUP Holding SETUP low during a reset cycle will force the modem into the configurator. The state of this input is checked while the SPM 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 SPM or pulled up to VCC via a suitable resistor (10k). 2.5 FORCING DEFAULT SERIAL BAUD RATE Asserting this pin low forces the SPM 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 SPM 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 resistor (10k). 2.6 FORCING SPACE MODEM IN TO SLEEP MODE Asserting the WAKE input high forces the modem into a low power sleep mode. This effectively shuts down the SPM 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 SPM to shutdown into low power sleep mode. HOST DRIVEN WAKE The WAKE pin may either be driven by the host (recommended) or pulled up to 0V via a suitable resistor (10k). Radiometrix Ltd, SpacePort Modem page 6 3.0 SPACEPORT CONFIGURATION 3.1 ENTERING THE CONFIGURATOR The SPM 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 SPM configuration. This will also set FLOW control to none to enable simple 3 wire communication None Set all SPM 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 SPM 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 without updating the stored value. This enables the SPACEPORT 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 to 15 Sets the host interface baud rate. The changed baud rate will take effect after resetting the SPM. 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 SPM. slots: effectively reduces the on-air throughput. This opens up `time slots' allowing other SPM pairs, operating within close proximity, equal opportunity to transmit data. fcc: sets the on-air throughput to a rate which is compatible with FCC regulations (max 10% air time) for use in the US. max max, slots, fcc Valid range UNIT default Valid range SITE default valid range ADDR Valid range BAUD default valid range THRUPUT default valid range Radiometrix Ltd, SpacePort Modem page 7 FLOW default valid range SERDLY Sets the serial flow control between the host and SPACEPORT. Using no flow control enables the SPM 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 SPM. Using hardware flow control enables the SPM to control the flow of serial data being received. hw hw, none Sets the serial data receive to packet transmit delay. When the SPM 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 SPM 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 SPM to monitor the WAKE input. When WAKE is taken high the SPM will be forced into low power sleep mode, thus reducing current consumption. Subsequently lowering the WAKE input will bring the SPM out of low power sleep mode. 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 SPM 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 SPM. The message can be disabled prior to deployment of the SPM 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 SPM in a broadcast mode. On on, off Enables remote configuration. Over-air remote configuration of a SPM 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 SPM module. On on, off default valid range SHDN default valid range RETRY default valid range STRTMSG default valid range ACKMODE default valid range REMOTE default valid range Radiometrix Ltd, SpacePort Modem page 8 RADAR parameter Starts the radar test. Used as a range or confidence test between SPM modules within the same site. Unit number between 0 and 15. Figure 4: SPM2 configuration using HyperTerminal Note: To configure the SPM the HyperTerminal should be set with the following settings. Hardware flow control should be disabled. Default baud rate of the SPM is 9600bps. However if the default baud rate of the SPM is changed then the baud rate of the HyperTerminal should be matched or DEFAULT jumper should be connected to force the SPM baud rate to 9600bps. Radiometrix Ltd, SpacePort Modem page 9 4.0 EXTENDED SPACEPORT FEATURES 4.1 THROUGHPUT The SPM supports two rates, MAX and SLOTS, of over-air throughput. A third rate is also provided which can be used during normal operation, but is specifically supplied for compliance with FCC regulations. MAX: When set to MAXimum and streaming data at the SPM, the data is sent as quick as possible. For host baud rates of 19200 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 14400bps. MAXIMUM ON-AIR THROUGHPUT With baud rates >9600bps Acknowledge Acknowledge Acknowledge Data Packet Data Packet Data Packet Data Packet A A A A Time Figure 5: A SPACEPORT MODEM pair streaming at maximum throughput SLOTS: Setting the throughput to SLOTS provides a method of opening `time slots' for other SPM pairs operating in close proximity. The effective streaming on-air throughput between a pair of SPM is effectively reduced to approximately 2400bps. SLOT ON-AIR THROUGHPUT With baud rates >4800bps Acknowledge Acknowledge Acknowledge Data Packet Data Packet Acknowledge Data Packet Data Packet A B A B Time Figure 6: Two SpacePort Modem pairs operating Slot throughput FCC: This setting is effectively the same as SLOTS, however it further slows the over-air throughput to approximately 1200bps. This mode is provided to enforce the modem to comply with FCC regulations of 10% maximum airtime usage. The THRUPUT should be set to FCC for all SPM modules used in all equipment subject to FCC regulations. Radiometrix Ltd, SpacePort Modem page 10 4.2 REMOTE CONFIGURATION Remote configuration of a SPM module is possible using the REMOTE command from within the configurator. The remote SPM 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 SPM. The format for the remote command then becomes: REMOTE Radiometrix Ltd, SpacePort Modem page 11 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 SPM'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 SPM implements packet acknowledges, timeouts and re-transmission to accomplish reliable error handling. Ordering information Part number SPM2-433-18 SPM2-433-18-3V SPM2-433-28 Throughput 18kbps 18kbps 30kbps Sensitivity -95dBm -90dBm -90dBm Supply 5V 3.3V 5V Radiometrix Ltd, SpacePort Modem page 12 Appendix A Radiometrix Ltd, SpacePort Modem 5V Figure 7: Example circuit to make radio modem with DCE type RS232 interface page 13 Appendix B (SOIC - 300mil wide body) TXD RXD SIGNAL RESET Vss (0V) TXR TXA RXR RXA 1 2 3 4 5 6 7 8 9 19 18 17 16 15 14 13 12 11 TX RX OSC1 OSC2 Vdd D3 D2 D1 Figure 8 (SOIC - 300mm wide body) RESET D0 D1 D2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 RXA OSC1 OSC2 27 26 25 24 23 22 21 20 19 18 17 16 15 RXR TXA TXR WAKE/DTR Vdd Vss TXD RXD CTS DEFAULT Figure 9 Radiometrix Ltd, SpacePort Modem page 14 Hartcran House Gibbs Couch Watford WD19 5EZ ENGLAND Tel: +44 (0)20 8428 1220 Fax: +44 (0)20 8428 1221 info@radiometrix.co.uk www.radiometrix.co.uk 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 Radiocommunications Agency (RA) web site: http://www.radio.gov.uk/topics/conformity/conform-index.htm The Library and Information Service The Radiocommunications Agency Wyndham House 189 Marsh Wall London United Kingdom E14 9SX Tel: +44 (0)20 7211 0502/0505 Fax: +44 (0)20 7211 0507 library@ra.gsi.gov.uk For further information on radio matters contact the Agency's 24 Hour Telephone Enquiry Point: +44 (0)20 7211 0211 European Radiocommunications Office (ERO) Midtermolen 1 DK 2100 Copenhagen Denmark Tel. +45 35250300 Fax +45 35250330 ero@ero.dk www.ero.dk |
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