Related Manuals for Elpro Technologies 905U-D
Summary of Contents for Elpro Technologies 905U-D
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Page 1: User Manual
User Manual 905U-D Radio Modem ELPRO Technologies Pty Ltd, 9/12 Billabong Street, Stafford Q 4053, Australia. Tel: +61 7 33528600 Fax: +61 7 33528677 Email: sales@elprotech.com Web: www.elprotech.com... - Page 2 905U-D Radio Modem 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 3: Fcc Notice
Important Notices FCC Notice: This user’s manual is for the ELPRO 905U-D radio telemetry module. This device complies with Part 15.247 of the FCC Rules. Operation is subject to the following two conditions: 1. This device may not cause harmful interference and 2. -
Page 4: Important Notice
Equipment should carry clear markings to indicate remote or automatic operation. E.g. "This equipment is remotely controlled and may start without warning. Isolate at the switchboard before attempting adjustments." The 905U-D module is not suitable for use in explosive environments without additional protection. Man_905D_1.10.doc... -
Page 5: Table Of Contents
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 6 905U-D Radio Modem User Manual 3.6.1 Auto-Connect Controlled Mode ................. 26 3.6.2 Low Power Auto-Connect Mode ................26 3.6.3 Single-Connect Controlled Mode ................26 3.6.4 Fast Operation Controlled Mode ................27 3.6.5 CTS/RTS Flow Control ..................... 27 3.6.6 Intermediate Repeaters ....................27 ? ................
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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
(user configurable - default 530 bytes). If more than 530 bytes is input, the 905U-D unit will transmit the first 530 bytes, then the next 530 bytes, and so on until all of the data has been transmitted. -
Page 9: Controlled Mode
“Controlled mode” provides “point-to- HOST point” communications similar to telephone HOST modems. In controlled mode, the flow of NO DATA data is controlled by the 905U-D units. DATA 905U-D Each 905U-D unit is configured with an 905U-D address by the user, and a destination address for the data to be transmitted to. -
Page 10: Repeater Units
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, there can be an unlimited number of repeaters, however with some conditions (refer to Section 3.5). -
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. Antenna Installation The 905U-D module will operate reliably over large distances. - Page 12 905U-D Radio Modem User Manual tolerated for shorter distances. For very short distances, it is possible to mount the antennas inside buildings. An obstructed path requires testing to determine if the path will be reliable - refer the section 6 of this manual.
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Page 13: Dipole And Collinear Antennas
Chapter Two Installation Where antennas are mounted on elevated masts, the masts should be effectively earthed to avoid lightning surges. For high lightning risk areas, surge suppression devices between the module and the antenna are recommended. If the antenna is not already shielded from lightning strike by an adjacent earthed structure, a lightning rod may be installed above the antenna to provide shielding. - Page 14 905U-D Radio Modem User Manual horizontal and must be pointed exactly in the direction of transmission to benefit from the gain of the antenna. The Yagi antennas 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 antennas, horizontal polarisation is recommended.
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Page 15: Power Supply
Chapter Two Installation Power Supply The 905U-D module is powered by a 10 - 30VDC or 13 – 24VAC supply. The power supply should be rated at 1 Amp and be CSA Certified Class 2. 905U-D For DC supplies, the negative side of the supply is connected to "COM"... -
Page 16: Rs485 Serial Port
2.4.2 RS485 Serial Port The RS485 port provides for communication between the 905U-D unit and its host device using a multi-drop cable. Up to 32 devices may be connected in each multi-drop network. Note that the RS485 port is shared internally with the RS232 port - make sure that the RS232 port is disconnected before using the RS485 port. - Page 17 Chapter Two Installation HOST 905U-D HOST RS485 CONNECTIONS HOST HOST 905U-D 120Ω RS485 CONNECTION USING TERMINATING RESISTOR Page 17 © January 2011...
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Page 18: Chapter Three
- only one serial port can be used at any one time. The radio communications is half-duplex - this means that the 905U-D operates at half duplex. Many applications use full duplex RS232 communications but do not require full duplex - the protocol used operates at half-duplex and will operate with the 905U-D without problems. -
Page 19: Character Type
530 bytes. 3.2.1 Character Type The 905U-D may be configured by the user to recognize the following types of characters - 7 or 8 data bits, even or odd or no parity, 1 or 2 stop bits. -
Page 20: Serial Data Rate
This could be used to allow a reply message to be received before the next message is sent. This delay is a different delay to the delay introduces by the 905U-D if the serial data rate is less than the radio data rate. -
Page 21: Addressing
The group address is not used in controlled mode. A 905U-D can also be configured with a “unit” address - this gives the module a unique identification. The unit address feature is not used in transparent mode, but it is used in controlled mode. -
Page 22: Transparent Mode Repeaters
That is, the re-transmitted message will now have the second group address. Only 905U-D modules configured with the second group address will accept the re-transmitted message. -
Page 23: Controlled Mode
One of the modules is configured as a “master” unit and the other as a “slave” unit. There can also be up to five intermediate repeaters in the link. Each 905U-D unit is configured with a unit address - only the unit with an address matching the destination address of the radio message will process the message and output the serial data. - Page 24 Once the communications channel has been established, the 905U-D unit will accept input data and send radio messages with data. When a 905U-D unit receives a radio message, it will check the system address and destination address, and also the error-check (optional). If these are correct, it will return a ACK (acknowledgment) message to the source unit.
- Page 25 Chapter Three Operation Successful Communications Source Module Destination Module • Serial data is received • Serial RX LED flashes • Listen to ensure channel is clear • Receive message • If clear, transmit message • Radio RX LED flashes • Radio TX LED flashes •...
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Page 26: Auto-Connect Controlled Mode
- power consumption is reduced to approx 30% of normal. The low power condition will occur if the 905U-D is configured for auto-connect mode AND if the low power mode feature is configured. The DTR signal on the RS232 port will control switching between low power and normal operation. -
Page 27: Fast Operation Controlled Mode
(number of bytes) and the number of repeaters. If the source module does not receive an ACK, 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 28: What Operating Mode To Use
It is possible to configure different units in the same system with different operating modes, however the system will not operate. A 905U-D unit configured in one mode will not process a message received from a unit in the alternate mode. -
Page 29: Serial / Radio Rates
There can be interference from other devices on the same band. As the “hopping sequence” used by the 905U-D is different to other devices on this band, the probability of two devices using the Page 29... -
Page 30: Operating Problems
0105 190 2345 has firmware version 1.90, with configurable message signatures. Note: If you are adding a new 905U-D to an existing system with older modules, you will need to set configuration register S21 to 0 to make it compatible with the older modules. - Page 31 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 antennas higher or in a better location.
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Page 32: Chapter Four Configuration
• Addressing - system address, group address, unit address. • 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 33: Addressing
When you use this program, you create a configuration in the PC and then load or program the configuration into the 905U-D module. You can also read the configuration from a module to edit. - Page 34 905U-D Radio Modem User Manual Reading and Configuring a module You will need a connection cable between the PC and the 905U-D. The cable should have straight- through connections section 2.4.1 of this manual. If your PC only has USB serial...
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Page 35: Transparent Mode
Chapter Four Configuration Modifying an existing configuration If you read a configuration from a module or a saved file, the program will display the configuration parameters. You can change these parameters, and then program the module and/or save the file. 4.4.1 Transparent Mode The default setting of the program is transparent mode. - Page 36 905U-D Radio Modem User Manual This should be a unique address for that module (1 – 127). Auto-Connect Master In auto-connect mode, the “master” will automatically attempt to connect to the slave address. Once connected, the link can transfer data in either...
- Page 37 Chapter Four Configuration however it can also be used for single-connect. In fast operation mode, the master and slave modules continually communicate with each other (even if there is no data) to minimize radio synchronizing time when data is to be transmitted.
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Page 38: Other Parameters
Packet Size (bytes) This selects the maximum number of bytes which will be transmitted in one message. If more than this number of bytes is input into the 905U-D, then the module will transmit more than one message. The default value is 530 bytes which is the largest packet value. If you are operating in a noisy... - Page 39 “Flow control” affects the use of the CTS and RTS signals on the RS232 port. These signals can be used to prevent overflow of the input buffer or output buffer of the 905U-D. The settings should be selected to match the host device. The options for this setting are : ...
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Page 40: Hayes Commands
ASCII messages designed for use with conventional telephone modems. Before a 905U-D unit will accept Hayes commands, it must be in “command” mode. A host device may force the unit to command mode by sending a sequence of three “escape” characters - “+++”. - Page 41 DIP switches (refer section 4.3), or by using the AT&F command. If you are making a change to an existing configuration, this step is not necessary. Appendix A details all of the Hayes commands accepted by the 905U-D. The following commands are the most common.
- Page 42 AT&Z0=33,34,35,5 will store an address sequence, where 5 is the destination address and 33, 34 and 35 are repeater addresses. The first repeater will be 33. The 905U-D master will attempt to connect to the destination address (slave). If the module cannot connect, or if communications fails, the module will continually send “connect”...
- Page 43 The module starts up in command mode and waits for a command from the host device. An ATD command will initiate a connect command to another module. HOS T 905U-D 905U-D HOS T For example, ATD8 to module #5 will initiate a connect command to be sent to module #8.
- Page 44 905U-D Radio Modem User Manual Controlled Mode Link Check and Reset times If the master module has not sent or received a radio message within a preset time, it will send a check message to make sure that the link is still active. If it does not receive a response from the slave unit, it will disconnect the link and reset DCD.
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Page 45: Configuration Examples
Display the elements of the stored configuration which differ from factory default. The 905U-D has two sets of configuration parameters - a set stored in non-volatile memory and an active set in RAM memory. Normally on start-up, the configuration is read from the stored memory to the active memory. - Page 46 Note that the repeater will only output data to its PLC for messages received from the first 905U-D. It will not output data from the right-hand PLC. If you set both group addresses to 1, then the repeater will output data from both sides - this is only possible when there is only one repeater.
- Page 47 Chapter Four Configuration Controlled Mode Source Repeater Repeater Destination #1 ----------------> #2 -----------------> #100 --------------------> #3 #101 Apart from being a repeater in the 1 - 3 link, 100 is also in a separate link to 101 Auto-connect link with repeaters Assume that default settings are used for data rates and character types.
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Page 48: Switch Configuration
905U-D Radio Modem User Manual Exit and save the configuration AT&W 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. - Page 49 Chapter Four Configuration Switch Function Equivalent Hayes Command at start-up. 0000 Normal Operation – no change 0100 Restore Factory Defaults. AT&F Baud rates 1100 Perform Transmit BER Test AT&T0 (for use with AT&T1 at Serial Radio other module - see section 6.2.1) 0010 Transparent Mode.
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Page 50: Chapter Five Specifications
905U-D Radio Modem User Manual Chapter Five SPECIFICATIONS General EMC specification FCC Part 15 EN 300 683 89/336/EEC AS 3548 Radio specification FCC Part 15.427 902 – 928MHz, 1W AS 4268.2 915 – 928MHz, 1W RFS29 NZ 920 – 928MHz, 1W... - Page 51 Chapter Five Specifications Expected line-of-sight range USA / Canada 20+ miles Australia / NZ 20+ km Range based on 19200 depending on local conditions baud. At 57600 baud, Range may be extended using expected range is 60%, intermediate modules as at 115200 baud, repeaters expected range is 30%.
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Page 52: Chapter Six Troubleshooting
Test Functions 6.2.1 Radio Testing - AT&Tx To aid in the checking and setup of the 905U-D unit, diagnostic functions are provided using the standard Hayes AT commands. To perform the tests, you will need a terminal (PC + hyper- terminal) set-up to match the module (same character type and serial speed). -
Page 53: Bit Error Rate Test (Ber)
Most radio tests are carried out using the AT&T2 test as this is the easiest to accomplish. AT&T3 - Received Signal Strength Display This option provides for testing the radio path between two 905U-D units. Although a pair of units may communicate successfully, radio communication may be affected by a range of influences, including atmospheric conditions, changing landscape, degradation of antennas or co-axial cable, low battery voltage etc. -
Page 54: On-Line Diagnostics
905U-D Radio Modem User Manual Test Errors Extra Level TotErr TotMissed TotTest -77dBm 109 kbit Test the sequence number of the last received frame Errors the number of bit errors in the last received frame Extra any extra characters at the end of the frame (negative numbers indicate frame... -
Page 55: Appendix Ahayes Commands
Appendix A Hayes Commands Appendix A Hayes Commands The following details all of the Hayes commands supported by the 905U-D. Default settings are shown by a “dot”, • Command Function Answer Incoming Connection message in controlled mode – the module can... - Page 56 905U-D Radio Modem User Manual ATSn? Read value from S-Register n, see description of S registers later in this section ATSn=xx Set value of S-Register n to xx Verbal/Numeric Response Codes Numeric response codes Verbose response codes V1• Extended Response Codes. Allows more detailed response codes, including connection speed.
- Page 57 Appendix A Hayes Commands &E1 Enable CRC Error Checking AT&F Restore Factory Defaults. This function is also available from the DIP Switches. AT&G Set module’s Group Address Range 0-255. Default 0. AT&K Flow Control Configuration. &K0 Flow Control Disabled. CTS Always high. Module ignores RTS. &K1 not used &K2...
- Page 58 905U-D Radio Modem User Manual If a key is hit or a character input while attempting to connect, abort the &N1• connection attempt and return to command mode. AT&S Set module’s System Address Range 0-255. AT&T Self Tests. Allows in-field diagnostics, and factory testing.
- Page 59 Appendix A Hayes Commands (ASCII code) 0-127 Carriage Return Character Normally 13 = <CR> 0-127 Line Feed Character Normally 10 = <LF> 0-127 Back Space Character Normally 8 = <BS> 0-255 Link Check Timer Units Seconds. 0 disables. How frequently to send a “Link Check”...
- Page 60 905U-D Radio Modem User Manual 0-255 Transmit Hold-off Time In msec (default = 0) 0-255 Receive Hold-off Time In msec (default = 0) 0-255 Input buffer delay Radio will not transmit until the number of characters in the input buffer = 2 x S18...
- Page 61 Appendix A Hayes Commands Response Codes Response codes display the status of the module in response to user commands. The response code displayed depends on the ATV setting, the ATX setting and the ATQ setting. ATV0 selects numeric response codes. ATV1 selects verbal response codes. The ATXn command selects extended response codes.
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