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905U-D Radio Modem Module
User Manual
Thank you for your selection of the 905U-D radio modem. We trust it
will give you many years of valuable service.
ATTENTION!
Incorrect termination of supply wires may
cause internal damage and will void warranty.
To ensure your 905U-D enjoys a long life,
double check ALL your connections with
the user's manual
before turning the power on.
Page 2
© May 2000
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Summary of Contents for ELPRO 905U-D
- Page 1 905U-D Radio Modem Module User Manual Thank you for your selection of the 905U-D radio modem. We trust it will give you many years of valuable service. ATTENTION! Incorrect termination of supply wires may cause internal damage and will void warranty.
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Page 2: Man_905Ud_2.0.Doc
Contents FCC Notice: This user’s manual is for the ELPRO 905U-D radio modem. This device complies with Part 15.247 of the FCC Rules. Operation is subject to the following two conditions: This device may not cause harmful interference and This device must accept any interference received, including interference that may cause undesired operation. - Page 3 How to Use This Manual To receive the maximum benefit from your 905U-D product, please read the Introduction, Installation and Operation chapters of this manual thoroughly before putting the 905U-D to work. Chapter Four Configuration details the configurations available and explains the diverse operation of the product in detail.
- Page 4 Contents WARNING In some countries, a radio licence is not required for the 905U-D telemetry modules provided the module is installed using the aerial and equipment configuration described in the 905U-D Installation Guide. In other countries, refer to the relevant Regulatory Authority.
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Page 5: Table Of Contents
905U-D Radio Modem Module User Manual CONTENTS CHAPTER ONE INTRODUCTION..................8 ......................... 8 ENERAL ....................... 9 RANSPARENT ...................... 10 ONTROLLED ......................11 EPEATER NITS CHAPTER TWO INSTALLATION..................12 ........................12 ENERAL ..................... 12 ERIAL NSTALLATION 2.2.1 Dipole aerial...................... 13 2.2.2 Three element Yagi aerial................. 13 2.2.3 Collinear (3dB) aerial.................. - Page 6 Contents 4.3.9 Version Information - ATI................34 4.3.10 Character Type - AT&Bx ................. 35 4.3.11 Character Type - AT&Mx ................. 35 4.3.12 Verbose mode control, Local Echo control, and Quiet mode......35 4.3.13 Responses ....................... 35 .................... 36 ONFIGURATION XAMPLES CHAPTER FIVE SPECIFICATIONS ..................
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Page 7: Chapter One Introduction
Examples of host devices are PLC’s, data loggers, intelligent transducers and computers. The 905U-D unit can receive data from the host device and transmit this data by radio to another (or several) 905U-D module. The other module will recreate the serial data and output it as either a RS232 or RS485 serial signal. -
Page 8: Transparent Mode
In this mode, modules are not configured with a unit address. Data is “broadcast” - every other 905U-D in the system will receive the data and output the data to their individual host devices. The user may configure the 905U-D modems to add error checking to each data packet transmitted - if error checking is configured, data will not be output if it is received without a correct error-check. -
Page 9: Controlled Mode
User Manual Controlled Mode In “controlled” mode, the flow of data is controlled by the 905U-D units. Each 905U-D unit is configured with an address by the user, and a destination address for the data to be transmitted to. Data is transmitted addressed to the destination module, and only this module will output the serial data. -
Page 10: Repeater Units
Chapter One Introduction Repeater Units A 905U-D unit may be used as a repeater to re- transmit radio messages. The purpose of a repeater unit is to extend radio range. In transparent mode, only one module per system may be used as a repeater. If more... -
Page 11: Chapter Two Installation
Further information is detailed below. Each 905U-D module should be effectively earthed via the "GND" terminal on the 905U-D module - this is to ensure that the surge protection circuits inside the 905U-D module are effective. Aerial Installation The 905U-D module will operate reliably over large distances. -
Page 12: Dipole Aerial
“3M 23 tape”, with a final layer of PVC insulating tape. Where aerials are mounted on elevated masts, the masts should be effectively earthed to avoid lightning surges. Although the 905U-D module is fitted with surge protection, additional surge suppression devices are recommended if lightning surge problems are experienced. If the aerial is not already shielded from lightning strike by an adjacent earthed structure, a lightning rod may be installed above the aerial to provide shielding. -
Page 13: Collinear (3Db) Aerial
905U-D Radio Modem Module User Manual The Yagi aerials may be installed with the elements in a vertical plane (vertically polarised) or in a horizontal plane (horizontally polarised). For a two station installation, with both modules using Yagi aerials, horizontal polarisation is recommended. If there are more than two... -
Page 14: Power Supply
The 12V supply is suitable for an unregulated DC supply. Where battery backup is required, a 12V battery charger may be used to supply the 905U-D module as well as charging the battery. The power requirements of the 905U-D units is 155mA at 12VDC or 100mA at 24VDC. The supply is protected by an internal 1A fuse, accessible at the bottom of the unit. -
Page 15: Rs485 Serial Port
CTS/RTS lines at the remote site. The 905U-D does not support XON/XOFF. Example cable drawings for connection to a DTE host (a PC) or another DCE host (or modem) are detailed below. -
Page 16: Communications Ok (Dcd) Output
It is important to maintain the polarity of the two RS485 wires. Communications OK (DCD) Output The 905U-D provides a digital output signal to indicate “communications OK” in controlled mode. The DCD (data carrier detect) output is “on” or active when a radio link has been established with the destination module. -
Page 17: Chapter Three Operation
The 905U-D may be forced to a low power condition where it switches off its receiver - power consumption is reduced to approx 20% of normal. The low power condition will occur if the 905U-D is configured for controlled mode (modes 6 or 7), AND if an autodial address is configured, AND if the low power mode feature is configured in the “character type”... -
Page 18: Serial And Radio Data
CTS control is provided on the RS232 port to prevent overflow. When the 905U-D unit detects data in the input buffer, it initiates a radio message. The radio message will end when the number of transmitted bytes reaches the maximum message length (configurable by the user). -
Page 19: Radio Data Rate
3.2.3 Radio Data Rate The data is transmitted by radio as direct modulated synchronous data at a rate between 1200 and 9600 bits per second. The user must configure the radio data rate at each 905U-D radio module. The configured data rates must be the same for each module in a system. -
Page 20: Transparent Mode
PLC systems designed for operation over a RS-485 network. One 905U-D unit may be configured as a repeater. This unit will not output data at its serial ports. Any message received at the radio port, with the correct system address, will be re- transmitted. - Page 21 The single-dial operation is similar to a dial-up modem. The 905U-D will make a connection to another unit only when it is told to by the host device. If the communications link fails for any reason, the master unit will not send a connect message until it receives another ATD command.
- Page 22 Chapter Three Operation Establishing a Communications Link Master Unit Slave Unit • Listen to ensure channel is clear • Receives message • If -------------------> clear, transmit “connect” message • Radio RX LED flashes • Radio TX LED flashes • Check system and destination address •...
- Page 23 905U-D Radio Modem Module User Manual Unsuccessful Communications Source Module Destination Module • Listen to ensure channel is clear • Receives message • If clear, transmit message -------------------> • RX LED flashes • TX LED flashes • Check system and destination address •...
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Page 24: What Operating Mode To Use
If the source module receives a NACK, or it does not receive an ACK within the waiting time, it will transmit the same message again. The 905U-D will transmit the message up to five times. If it does not receive an ACK after the 5 attempt, it will assume communications failure and reset its DCD status. -
Page 25: Operating Problems
These bytes are used to detect any corruption of the data when it is received at another 905U-D unit. When a unit with error-check configured receives a radio message, it will not output data until it has received the whole message and ensures that the error-check is correct. - Page 26 Interference will only cause a problem if the amplitude of the interference is comparable to the radio signal from the 905U-D units. If the interference level is relatively small, then it will not affect the performance of the system. If interference is causing a problem, try to improve the normal radio level by mounting the aerials higher or in a better location.
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Page 27: Chapter Four Configuration
The main parameters are :- • Character type. You need to find out the character type of the host devices connected to the 905U-D units. The most common character type is 8 data bits, no parity, 1 start bit and 1 stop bit. •... -
Page 28: Unit Reset
Chapter Four Configuration Before a 905U-D unit will accept Hayes commands, it must be in configuration mode. A host device may force the unit to configuration mode by sending three “escape” characters - “+++”. The default escape character is “+”, however this may be changed as it is one of the configuration parameters Note that in the Host-connect operating modes, the 905U-D units start up in configuration mode. - Page 29 ATS4 = xxx Default = 8 To select or change the serial data rate, enter the following VALUE code. The serial data rate can be different at different 905U-D modules in the same system. The default value is 9600 bits/sec. Page 30...
- Page 30 ATS5 = xxx Default = 1 To select or change the radio data rate, enter the following VALUE code. The radio data rate should be the same at each 905U-D module in the same system. The default value is 4800 bits/sec. Bits/sec...
- Page 31 905U-D Radio Modem Module User Manual NOTE : These values are valid for software version 1.11 and later. For earlier versions, refer to your distributor. To find out the software version, use the ATI command. Data Start Stop Parity CTS/ RTS control...
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Page 32: Changing Destination/Repeater Address - Autodial
If there has been no AT commands entered within this time, the 905U-D will automatically change from configuration mode to operating mode. If S11 is set to 0 (zero), the 905U-D will not automatically change, and will only change to operating mode when a ATO command is entered. -
Page 33: Connecting To A Remote Module - Single Dial
905U-D Radio Modem Module User Manual The module will automatically attempt to connect to the destination address. For example, to set the destination address to 18 with repeater addresses 2 and 8, the command would be - AT&Z2,8,18 If the destination address was to be 105 with no repeaters, the command would be AT&Z105 or AT&Z105&W (this command also stores the change in permanent memory). -
Page 34: Character Type - At&Bx
Chapter Four Configuration 4.3.10 Character Type - AT&Bx This command allows configuration of the character format and flow control used on the serial port. The x value is the same as the character type command under S-register 9. Note: The value of this setting is also available via S-register S9 4.3.11 Character Type - AT&Mx This command allows configuration of the operating mode. -
Page 35: Configuration Examples
905U-D Radio Modem Module User Manual Configuration Examples Transparent Mode Extending a PLC Network RS485 9.6KB 405U 405U 405U RS485 9.6KB 9.6KB 38.4KB REPEATER DATA = 7 DATA BITS, 1 START, 2 STOP, EVEN PARITY Unit No. 1 Configuration Set the module to factory default settings: AT&F... - Page 36 Chapter Four Configuration Exit and save the configuration AT&W Note that it was not necessary to set the serial data rate as 9600 is the default setting. Controlled Mode Point-to-point link with repeaters Assume that default settings are used for data rates and character types. The only configuration required is addressing.
- Page 37 905U-D Radio Modem Module User Manual Module #100 Note that #100 is the master unit for a link between #100 and #101, It is also acting as repeater in the #1 to #3 link. The system address for #100 and #101 must be the same as the other modules so that #100 can act as a repeater.
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Page 38: Chapter Five Specifications
Chapter Five Specifications Chapter Five SPECIFICATIONS General EMC specification EN55022 (CISPR 22) 89/336/EEC EN 50082-1, EN 300 683 AS 3548 Radio specification MPT 1329 UK 458 MHz, 500 mW EIRP EN-300-220 430 - 450 MHz, 10 - 500 mW AS 4268.2 AUST 472 MHz, 100 mW EIRP RFS29 NZ 458 MHz, 500 mW EIRP... - Page 39 905U-D Radio Modem Module User Manual Spurious emissions RX - <-57 dBm TX - <-37 dBm Frequency Stability +/- 1. 0 kHz Receiver Sensitivity 0.4uV at 12dB SINAD Signal detect / RSSI -120 to -80 dBm Expected line-of-sight range 2 km @ 10mW EIRP...
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Page 40: Chapter Six Troubleshooting
Chapter Six Troubleshooting Chapter Six TROUBLESHOOTING Diagnostics Chart INDICATOR CONDITION MEANING • Power supply failure OK LED OFF Continuously • CPU failure • Normal Operation OK LED ON Continuously • Radio transmitting Radio TX LED ON Flashes briefly • Radio receiving data Radio RX LED ON GREEN flash •... -
Page 41: Diagnostic Functions - At&Tx
905U-D Radio Modem Module User Manual The tone reversals function is initiated by setting all of the DIL switches to ON, and holding down the red button for approximately 5 seconds (until the Serial RX LED indicates RED continuously). On releasing the button, the RX LED will flash continuously, and the TX LED will light, indicating that the radio transmitter is on. - Page 42 Chapter Six Troubleshooting When using this feature, the current value of the received signal strength is displayed in dBm (decibels referenced to 1 mW). This value is updated every half second. To check the radio path between two units, select the signal option at the local unit. The remote unit may then be set up for tone reversals (refer 1 above) and the signal level read from the computer screen.
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Page 43: Bit Error Rate Test (Ber)
905U-D Radio Modem Module User Manual 6.2.3 Bit Error Rate Test (BER) BER may be tested in one direction by typing AT&TA (BER master) at the sending unit and typing AT&TB (BER slave) at the receiving unit. The sending unit will repeatedly send pseudo-random frames, and the receiving unit will check these frames for errors. -
Page 44: Chapter Seven Warranty & Service
Chapter Seven Warranty and Service Chapter Seven WARRANTY & SERVICE We are pleased that you have purchased this product. Your purchase is guaranteed against defects for a 365 day warranty period, commencing from the date of purchase. This warranty does not extend to: Failures caused by the operation of the equipment outside the particular product's specification. -
Page 45: Appendix A Switch Configuration
905U-D Radio Modem Module User Manual Appendix A Switch Configuration Introduction In order to configure the 405U unit, or to change the configuration, the unit must be placed into Configuration Mode. When in this mode, the unit will not operate as transparent or controlled mode. -
Page 46: Default Configuration
Appendix A Switch Configuration Once the module is in configuration mode, transparent or controlled mode may be selected. This is achieved by entering in another switch pattern. If transparent mode is selected, no further configuration is required, and the module will automatically exit configuration mode. If controlled mode is selected, further entries are required for the addressing of the communications link. - Page 47 905U-D Radio Modem Module User Manual Note that repeater and destination addresses are only entered for the “master” unit in each link. For “slave” units, only the unit address is entered. For modules which will just act as a repeater unit, just a unit address need be entered. For these modules, enter the exit pattern of all zero’s after the unit address.
- Page 48 Appendix A Switch Configuration 0 0 0 0 • Unit address is 0000001 (#1) 0 0 0 0 0 0 0 0 • First repeater address is 0000010 (#2) 0 0 0 0 0 0 0 0 • Second repeater address is 1100100 (#100) 0 1 1 0 0 0 0 0...
- Page 49 905U-D Radio Modem Module User Manual 0 0 0 0 • Configuration complete 0 0 0 0 Module #100 Configuration Module #100 is the second repeater in the link between #1 and #3. It also has a host device and transmits data to #101. It is configured as the “master” unit for the #100 - #101 link. As it has the unit address #100, it will also act as a repeater for #1 - #3.
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Page 50: Configuration Parameters
Appendix A Switch Configuration Module #3 Configuration As module #3 is the “slave” unit for this link, only the unit address is required for the configuration. 0 1 0 0 • System address 100100100010010. 0 0 0 1 0 0 0 0 •... -
Page 51: Operating Mode
905U-D Radio Modem Module User Manual 1.1.1 Operating Mode PARAM = 0 0 0 0 Default = 0 0 0 0 0 1 0 0 Mode Value Option Connect Mode 0 0 0 0 0 0 0 0 Transparent mode without error-check... -
Page 52: Serial Data Rate
Appendix A Switch Configuration Hence for a desired message of 10 bytes, a VALUE code of zero (00000000 ) is entered. For the maximum length of 520 bytes, a MESSL code of 255 (11111111) is entered. The default message length is 520 bytes. 1.1.4 Serial Data Rate PARAM = 0 1 0 0 Default = 0 0 0 0 1 0 0 0... -
Page 53: Receive Hold-Off Time
405U Radio Modem Module User Manual 1.1.7 Receive Hold-off Time PARAM = 1 1 0 1 Default = 0 0 0 1 0 1 0 0 A delay time may be configured such that the 405U unit will not transmit a message during the hold-off time after receiving a message. -
Page 54: Connect Update Time
Appendix A Switch Configuration Data Start Stop Parity CTS/ RTS VALUE Bits Bits Bits control even disabled 0 0 0 0 1 1 0 0 disabled 0 0 0 0 1 1 0 1 none disabled 0 0 0 0 1 1 1 0 even disabled 0 0 0 0 1 1 1 1... - Page 55 405U Radio Modem Module User Manual Unit No. 1 Configuration • Set the System Address 1 0 1 • Press the red button for approx. 3 seconds - until the Serial RX LED 1 0 1 indicates RED. 0 0 0 0 •...
- Page 56 Appendix A Switch Configuration 0 0 0 0 • Configuration mde will automatically exit as Transparent Mode 0 0 0 0 1 0 0 • Set Operating Mode to Transparent Repeater and press button until RX 0 0 0 0 LED lights.
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Page 57: Appendix Bdecimal To Binary Table
405U Radio Modem Module User Manual Appendix B DECIMAL TO BINARY TABLE VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN 0 0 0 0 0 0 0 0 0 0 1 0 0 1 1 0 0 1 0 0 1 1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 1 1 1... - Page 58 Appendix B Decimal to Binary Table VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN 0 1 1 1 0 0 1 0 1 0 0 1 0 1 1 1 1 0 1 1 1 1 0 0 0 1 1 1 0 0 1 1 1 0 0 1 1 0 0 0 1 0 1 1 1 1 0 1...
- Page 59 405U Radio Modem Module User Manual VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN VALUE 8 BIT PATTERN 1 1 1 0 0 1 1 0 1 1 1 1 0 0 0 1 1 1 1 1 1 1 0 0 1 1 1 0 0 1 1 1 1 1 1 1 0 0 1 0 1 1 1 1 1 1 0 1...
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