WTS BASE STATIONS USER MANUAL
Contents
1. 23351 a WTS BASE SATIONS doc 4 SW1 SETTINGS 4 1 Address Switch positions 1 to 4 select the base station Address This should normally be 1 1 2 3 4 Address 1 Off Off Off Off 2 On Off Off Off 3 Off On Off Off 4 On On Off Off 5 Off Off On Off 6 On Off On Off T Off On On Off 8 On On On Off 9 Off Off Off On 10 On Off Off On 11 Off On Off On 12 On On Off On 13 Off Off On On 14 On Off On On 15 Off On On On 16 On On On On 4 2 Serial USB Switch positions 5 to 7 set whether serial or USB is used If USB is not selected then the chosen switch settings control the baudrate for the serial interface Whether the serial interface is RS485 or RS232 is selected by switch position 8 5 6 7 Baudrate USB USB Off Off Off 9600 On Off Off 19200 Off On Off 38400 On On Off 57600 Off Off On 115200 On Of On 230400 Off On On 460800 On On On 4 3 RS232 RS485 If USB is not selected as the interface Switch positions 5 to 7 then this switch position selects whether the serial interface is RS232 or RS485 8 232 485 RS232 Off RS485 On HEEP Document No Sherborne Sensors the first choice in precision 23351 1 Ringway Centre Edison Road Basingstoke Hampshire RG21 6YH UK Sheet 4 of 7 23351 a WTS BASE SATIONS doc 5 POWER If the base station is configured as USB then the USB bus will power it If RS232 or RS485 are selected then external power will need to be connected to J4 on the2. ccccccssscesscceeseeesenseseeseeeseeseseeeeeaeees 6 gaa 2 Tere er eg en eee ne err ere tee see aS 7 121 O11 gh gt SRR meee a RO PAPE PBI ROE A OETA SIDER BEE BIDEN BNET OTTER ADEN ORO EN SCPE 7 12 2 Guidelines TOF installation scciivicccieccciccnsisecdesdsblcddcycceycesadvenancoivendesadvsesvsedsenddseceeundsecddyceseceeednd 7 12 Anena kOe A O nese tiene aaa eee ee 7 1 INTRODUCTION OVERVIEW Base stations are the interface between the WTS radio system and a PC PLC or other controller A base station will be required to capture data from devices to a PC or PLC Two base stations currently support the WTS range the WTS BSU and the WTS BSI which in conjunction with the WTS Viewer and or WTS Log24 PC software can be used to listen to all the devices within the range Base stations can listen to any WTS within range therefore making control and group measurement very simple 1 1 WTS BSI The WTS BSI is the industrial base station housed in a sealed enclosure This device offers far more interface options for a user The WTS BSI can be powered and controlled using a single USB interface however the WTS BSI also has serial RS232 and RS485 interfaces at baud rates of 9600 460800 When using either of the serial interfaces the device must be powered externally 1 2 WTS BSU The WTS BSU is a simple USB device It draws power from the USB bus and therefore no further components are required to listen to remote devi
3. WTS BASE STATIONS USER MANUAL Revision History Date Issue Author Comments Approved by 09 09 11 A JRK First Issue MAB HHHH Document No Sherborne Sensors the first choice in precision 23351 1 Ringway Centre Edison Road Sheet 1 of 7 Basingstoke Hampshire RG21 6YH UK 23351 a WTS BASE SATIONS doc CONTENTS 1 INTRODUCTION OVERVIEW cccccccccscscccsseseesssseeeseeeeseeeeaseeenaueeenaueeenauesenaeeseanesnees 2 1 1 Ui eeraa a ceca cecatncn a eLE 2 12 WV ews ARAA A RAAR ARE A AA AE AA A A A A E A E AT 2 2 ADDRESSING a E ere ey Sere eect ce cerry 3 3 CONISTON uric aera acess eee eee ee 3 3 1 WES BSU ree e a E 3 32 WIS BSh p e a E TO TETTE ee 3 4 SWI SETTING aie ee ee ee eee 4 4I PAO SS eleo ielenana tabesteni tel E T ie ludeis e a e e aaia 4 42 Solal U SB ae aaa a a a a a a a E sane seer ak 4 4 3 TROZ O27 PROF 0 scott ee runearen runerne neenu anen n eenn 4 5S POWER E E eae 5 6 LED INDICATION sercsics secretes acs chceenctea aroba trenetan teatada rarei beecduaadieaataseeteacieeieatavecnrecane 5 Be We E A A E A E E 5 acre cae a wa cic ccs eee eee 5 9 SERIAL LIMITATIONS eset caciaceca ccesscct ncecsacacceacace nasiacers bomauacinesawecebanadecabenaaetaiviaaedsteuennenn 5 10 MIGSES caccszcasherssincniestcasasevactertcencensavadcusberenccuiscubetwaiyeiicerasenaresarebisenceuscssaisabaserceuaccuaivelivenssuiaes 6 11 ADVANCED MULTIPOINT BASE STATION SG
4. V and V pins 6 LED INDICATION Two LEDS indicate Power Mode and Activity The red LED indicates mode and should flash at a 2Hz rate If any errors are detected with the radio then the LED will remain lit The green LED flashes once for each packet received or transmitted via radio USB or serial 7 RS232 The RS232 interface uses TX RX and GND to connect to a PC PLC etc and uses standard RS232 voltage levels The baudrate can be selected by setting the DIP switches stated above NOTE the base station will require power cycling to utilise a baudrate change Example connection to a PC 9 way D serial connector PC 9 Way D Plug Pin Signal Direction Base Station Connection 3 TX gt RX J6 RX or J7 Pin 3 2 RX lt TX J6 TX or J7 Pin 2 5 Gnd GND J6 GND or J7 Pin 5 8 CTS lt CTS J6 CTS or J7 Pin 8 8 RS485 The RS485 interface This is a 2 wire 485 interface and will not work with 4 wire 485 buses uses TX RX and GND to connect to a PC PLC etc and uses standard RS485 voltage levels The baudrate can be selected by setting the DIP switches stated above NOTE the base station will require power cycling to utilise a baudrate change Example connection Depending on the RS485 interface or hardware the connections vary and are not standard therefore we can only show the connections to the base station You must refer to the user manual regarding your RS485 connection to ascertain the correct connections PC PLC Connection S
5. ces from a PC HERPE Document No Sherborne Sensors 23351 the first choice in precision 1 Ringway Centre Edison Road Basingstoke Hampshire RG21 6YH UK Sheet 2 of 7 23351 a WTS BASE SATIONS doc 2 ADDRESSING Usually only a single base station is required in a telemetry installation If a telemetry device is outside the range of the base station a repeater may be deployed Some complex topologies may only be realized by using multiple base stations which may require changes to the Address switches See Advanced Multipoint Base Station Section Our industrial base station WTS BSI has interfaces for USB RS232 and RS485 and is addressable Our USB only base station WTS BSU has a fixed address of 1 so only one can be connected to a PC at a time 3 CONNECTIONS 3 1 WTS BSU This base station simply connects to the USB port of a PC and is powered from the USB bus 3 2 WTS BSI This diagram shows the available connections switches and LEDs RS232 RS232 J7 J6 GND Rx CTS PA L 120R TERM i ACTI MODE J4 gt I Dm A j I oO N Peet The interface can be selected from the DIP switches SW1 as can baudrates for serial interfaces and the Address of the base station i RS485 Artes POWER CAEL Document No Sherborne Sensors eas the first choice in precision 1 Ringway Centre Edison Road Basingstoke Hampshire RG21 6YH UK Sheet 3 of 7
6. enna elevation will often improve reception 12 3Antenna Orientation The base station WTS BSI should be mounted horizontally e g on a wall or ceiling so that the side with the product label on it the face containing the PCB antenna faces the general direction of the target devices HEFP Document No Sherborne Sensors 23351 the first choice in precision 1 Ringway Centre Edison Road Basingstoke Hampshire RG21 6YH UK Sheet 7 of 7 23351 a WTS BASE SATIONS doc
7. ignal Direction Base Station Connection Refer to RS485 Device User Manual A J4 A Refer to RS485 Device User Manual B J4 B Refer to RS485 Device User Manual GND J4 SH NOTE There are two connectors for RS485 J4 and J5 This is to facilitate easy daisy chaining of devices if required 9 SERIAL LIMITATIONS When using RS232 or RS485 you should use the fastest baudrate possible At lower rates data can be lost because it can arrive from the radio faster than the base station can send it serially HEFP Document No Sherborne Sensors 23351 the first choice in precision 1 Ringway Centre Edison Road Basingstoke Hampshire RG21 6YH UK Sheet 5 of 7 23351 a WTS BASE SATIONS doc 10 USB Connection to the base station will be either a captive USB cable WTS BSU or a USB socket B for connection using a standard USB A B cable WTS BSI To communicate with the base station the connected device must use the USB HID Device Class and support USB 2 0 full speed interface 12mbits The USB connection will also power the base station 11 ADVANCED MULTIPOINT BASE STATIONS Sometimes more than one base station is required in a system This may simply be a central PC with two base stations wired off in opposite directions 4 Z z i A Where one base station handles devices on the left and the other those on the right Multiple base stations allow flexibility in routing requests from a PC as each time a packet is
8. sent to a base station it is targeted to a particular base station Address When a packet arrives back at a PC it contains the Address of the base station that routed it If a base station is the only one connected to a particular serial port then every base station can have Address 1 as the PC will send packets to a particular port to select which base station handles a packet likewise packets arriving back at the PC will be identified by the port that they arrive on RS232 devices can only be connected one at time anyway but RS485 allows multiple devices on the same bus This is where the Addressing is vital as it is this that distinguishes between base stations When using USB base stations you may only ever have one WTS BSU connected to a PC at any time Using WTS BSI will allow multiple USB base stations to be connected to single PC Unique Addresses are again required in this instance Note that broadcast packets can be received by multiple base stations so packets may appear duplicated at the PC end It is also possible for the PC to route a packet through all connected base stations by addressing a packet to Address 0 Document No Sherborne Sensors the first choice in precision 23351 1 Ringway Centre Edison Road Sheet 6 of 7 Basingstoke Hampshire RG21 6YH UK 23351 a WTS BASE SATIONS doc 12 INSTALLATION 12 1 Overview Radio performance at microwave wavelengths is very dependent upon the opera
9. ting environment any structure within the operating region of the radios will give rise to three effects e Obscuration Obscuration will result in reduced range and occurs when an obstruction masks the line of sight between radios e Aberrations to the horizontal and vertical space patterns Distortion of these patterns may occur if structures or objects are placed in the near or intermediate field of the antenna The effect will be to distort the coverage patterns adversely affecting range and link quality e Reflection Any object placed in line of sight of the transmit antenna will result in signals arriving at the receiver by an indirect path Degradation of performance due to reflection multipath effects appears as reduced range or poor link quality Any of the above will cause poor RSSI figures an increase in the packet loss rate and in extreme cases complete loss of signal Fortunately if consideration is given to these effects at the integration stage then a good quality link will be obtained 12 2 Guidelines for installation When planning installations ensure that line of sight between nodes is maintained and that objects or structures are kept at least one metre away from antennae wherever possible To avoid poor link quality between a WTS Inclinometer and a handheld device ensure that the antenna is vertical Improvement may also be obtained by altering the height above ground of the antenna a small increase or reduction in ant
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