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Microwave Data Systems EL805, Руководство по установке и эксплуатации

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MDS 05-2708A01, Rev.  B

MDS TransNET 900 I&O Guide

3

 

2.3 Spread Spectrum Radios—

How Are They Different?

 

The main difference between a traditional (licensed) radio and the 
MDS TransNET 900 transceiver is that this unit “hops” from channel to 
channel many times per second using a specific hop pattern applied to all 
radios in the network. A distinct hopping pattern is provided for each of the 
65,000 available network addresses, thereby minimizing the chance of 
interference with other spread spectrum systems. In the USA, and certain 
other countries, no license is required to install and operate this type of radio 
system, provided that RF power and antenna gain restrictions are observed.

 

2.4 Typical Applications

 

Multiple Address Systems (MAS)

 

This is the most common application of the MDS TransNET 900 transceiver. 
It consists of a central control station (master) and two or more associated 
remote units, as shown in 

Figure 3

. An MAS network provides 

communications between a central host computer and remote terminal units 
(RTUs) or other data collection devices. The operation of the radio system is 
transparent to the computer equipment. When used in this application, the 
transceiver provides an excellent alternative to traditional (licensed) MAS 
radio systems.

 

Invisible 

place 

holder

 

Figure 3. Typical MAS network

MDS TransNET
Remote

MDS TransNET
Remote

MDS TransNET
Master

MDS TransNET
Remote

MDS TransNET
Remote

RTU

RTU

RTU

RTU

Host System

RX

D

TXD

SY

NC

PW

R

RX

D

TXD

SY

NC

PW

R

RX

D

TXD

SY

NC

PW

R

RX

D

TXD

SY

NC

PW

R

RX

D

TXD

SY

NC

PW

R

Содержание EL805

Страница 1: ...Installation Operation Guide Installation Operation Guide MDS 05 2708A01 Rev B AUGUST 2002 Microwave Data Systems Inc MDS TransNET 900 Spread Spectrum Data Transceiver Model EL805...

Страница 2: ...command Each radio in the system must have the same network address Tip Use the last four digits of the Master s serial number to help avoid conflicts with other MDS TransNET 900 networks Set the bau...

Страница 3: ...sNET Network with a Repeater 5 2 5 Accessories 5 3 0 INSTALLATION PLANNING 6 3 1 General Requirements 6 3 2 Site Selection 7 Terrain and Signal Strength 7 Conducting a Site Survey 8 3 3 A Word About R...

Страница 4: ...o Programming Methods 21 Terminal Interface 21 PC Based Configuration Tool 21 6 2 User Commands 22 Entering Commands 22 6 3 Detailed Command Descriptions 27 ADDR 1 65000 27 AMASK 0000 0000 FFFF FFFF 2...

Страница 5: ...00000000 FFFFFFFF 38 XPRI 0 31 38 XRSSI NONE 40 120 38 ZONE CLEAR 38 ZONE DATA 38 7 0 TROUBLESHOOTING 39 7 1 LED Indicators 40 7 2 Alarm Codes 40 Checking for Alarms STAT command 40 Major Alarms vs M...

Страница 6: ...a Systems are committed to understanding and exceeding our customer s needs and expectations We appreciate our customers patronage They are our business We promise to serve them and anticipate their n...

Страница 7: ...er in hazardous locations and may void the approval 5 A power connector with screw type retaining screws as supplied by MDS must be used When installed in a Class I Div 2 Groups A B C or D hazardous l...

Страница 8: ...vi MDS TransNET 900 I O Guide MDS 05 2708A01 Rev B RXD TXD SYN C PWR...

Страница 9: ...out going to the remote radio site Using appropriate software at the master station diagnostic data can be obtained on any DSP radio in the system even while payload data is being transmitted See Perf...

Страница 10: ...res may not be available on all radios based on the options purchased and the applicable regulatory constraints for the region in which the radio will operate 2 2 Model Configuration Codes The model n...

Страница 11: ...ictions are observed 2 4 Typical Applications Multiple Address Systems MAS This is the most common application of the MDS TransNET 900 transceiver It consists of a central control station master and t...

Страница 12: ...te to an associated MDS TransNET 900 installed at one of the licensed remote sites See Figure 5 As the data from the outlying site is received at the licensed remote site it is transferred to the lice...

Страница 13: ...Part No AC Power Adapter Small power supply module designed for con tinuous service UL approved Input 120 220 Output 12 Vdc 500 mA 20 Watts Consult factory Omnidirectional Antennas Rugged antennas sui...

Страница 14: ...to N Adapter Cable 6 foot 1 8 meter length of coaxial cable used to connect the radio s TNC antenna connector to a Type N style commonly used on large diam eter coaxial cables 97 1677A160 TNC to N RF...

Страница 15: ...kly determined in most cases A possible exception is the last item verifying that an unobstructed transmission path exists Radio signals travel primarily by line of sight and obstructions between the...

Страница 16: ...of the radio sites in your system it is best to evaluate them before a permanent installation is begun This can be done with an on the air test preferred method or indirectly using path study software...

Страница 17: ...e helpful to use horizontal polarization of all antennas in the network Because most other services use vertical polarization in this band an additional 20 dB of attenuation to interference can be ach...

Страница 18: ...in an MAS system This provides equal coverage to all of the remote sites NOTE Antenna polarization is important If the wrong polarization is used a signal re duction of 20 dB or more will result Most...

Страница 19: ...g a low loss cable type suited for 900 MHz such as Times Microwave LMR 400 or Andrew Heliax Table 2 lists several types of feedlines and indicates the signal losses in dB that result when using variou...

Страница 20: ...e feedline loss is 1 5 dB the antenna system gain would be 8 dB If the antenna system gain is 6 dB or less no power adjustment is required 2 Subtract the antenna system gain from 36 dBm the maximum al...

Страница 21: ...procedure for installing the transceiver In most cases these steps alone will be sufficient to complete the installation Should further information be required contact the factory using the informatio...

Страница 22: ...ons Additional information on antennas and feedlines is contained in Section 3 4 on Page 10 NOTE Strong fields near the antenna can interfere with the operation of the low level RTU circuits and chang...

Страница 23: ...primary power for the transceiver It must be within 6 30 Vdc and be capable of providing 7 5 watts over this voltage range Typical current draw is 510 mA 13 8 Vdc 1 25A 6 Vdc A power connector with s...

Страница 24: ...and preparing it for use refer to Section 6 1 on Page 21 The three essential settings for the TransNET Transceiver are as follows Mode Master Remote or Extension Network Address a unique number from...

Страница 25: ...n of each unit in a data file on your PC s hard drive through the use of the MDS TransNET Configuration Software Most often there are many Remote units that will need configuring Using the MDS TransNE...

Страница 26: ...ved and all normal functions are suspended The radio can be awakened by your RTU every minute or so to verify synchronization with the master station When Pin 4 is opened or an EIA RS 232 high is asse...

Страница 27: ...d receiving data RXD with master station 5 2 Performance Optimization After the basic operation of the radio has been checked you may wish to optimize its performance using some of the suggestions giv...

Страница 28: ...accurate readings a wattmeter suited for 1000 MHz is required One unit meeting this criteria is the Bird Model 43 directional wattmeter with a 5J element installed The reflected power should be less t...

Страница 29: ...cted to the radio s DIAG connector using an RJ 11 to DB 9 Adapter Cable MDS Part No 03 3246A01 If desired a cable of this type may be constructed using the information shown in Figure 20 on Page 54 On...

Страница 30: ...roke For programming commands the command is followed by the appropriate information or values and then Table 5 Network Configuration Master Station COMMAND DESCRIPTION BUFF ON OFF Details page 28 ON...

Страница 31: ...rm present HI BAUD xxxxx abc Details page 28 Data communication parameters CODE NONE 1 255 Details page 29 Select the security encryption setting in the radio CTS 0 255 Details page 29 CTS delay in mi...

Страница 32: ...nit Extension XMAP 00000000 FFFFFFFF Details page 38 Included Extended units in MODE X Exten sions and Remotes only XRSSI NONE 40 120 Details page 38 Minimum RSSI level required to preserve syn chroni...

Страница 33: ...r s name or system name PORT Details page 32 Current data port DATA connector interface signaling mode RS232 or RS485 PWR Details page 34 Forward power output setting in dBm REPEAT Details page 34 The...

Страница 34: ...g At Remotes Only SREV Details page 37 Transceiver firmware revision level STAT Details page 37 Current alarm status TEMP Details page 37 Transceiver s internal temperature C UNIT Details page 37 Prog...

Страница 35: ...65000 A network address must be programmed at the time of installation and must be common across each radio in a given network Radios are typically shipped with the network address unprogrammed causi...

Страница 36: ...must be one of the following speeds 1200 2400 4800 9600 19200 38400 57600 or 115200 At baud rates of 19200 bps or less the radio can support unlimited continuous data transmission at any hop rate The...

Страница 37: ...provides an extra level security beyond that provided by the Network Address ADDR The disadvantage is increased complexity in managing the network The CODE command takes an argument 1 255 or NONE Ente...

Страница 38: ...s in a repeater or tail end link system The RTS line is ignored and the CTS line is used as a keyline control for the other radio CTS is asserted immediately after the receipt of RF data but data will...

Страница 39: ...o view the FEC setting or turn it on or off The default setting is FEC ON It needs to be turned off when throughputs exceed 57 600 bps FEC is set at the master and is automatically passed on to all of...

Страница 40: ...transmitter Radio must be in Setup mode See also DKEY command MODE M R X The MODE command sets or displays the operating mode of the radio A master radio is set by MODE M a remote set by MODE R and an...

Страница 41: ...Output Sense RS 232 High 5 0 Vdc ASENSE RX Time out Timer None Disable RXTOT Transmitter test frequency 915 000 MHz TX xxx Receiver test frequency 915 000 MHz RX xxx Sleep Enable OFF SLEEP OFF Data Po...

Страница 42: ...te radio will re transmit data The default setting is 10 This command is associated with ARQ Automatic Repeat Request operation of the radio and is intended for use in areas with heavy radio interfere...

Страница 43: ...ternal RTU or the radio The default RTU setting is OFF RX xxxx This command sets or displays the test receive frequency used in place of hopping when the radio is in SETUP mode The test receive freque...

Страница 44: ...the number of downstream links from the Master is displayed in parentheses SKIP NONE 1 8 This command sets or displays which if any of the eight 3 2 MHz wide zones will be skipped from the radio s ho...

Страница 45: ...event is identified as a Major or Minor alarm A brief description of the event is also given If more than one alarm exists the word MORE appears and additional alarms may be viewed by pressing the ke...

Страница 46: ...t to synchronize with any Master or Extension in the XMAP list Parameter only meaningful for a Remote or Extension XRSSI NONE 40 120 The XRSSI command is used to set the RSSI minimum signal level requ...

Страница 47: ...master for polling instructions and synchronization data If the master station has problems the operation of the entire network will be affected When communication problems are found it is good practi...

Страница 48: ...arm exists the word MORE appears at the bottom of the screen additional alarms can be viewed by pressing Major Alarms vs Minor Alarms Major alarms report serious conditions that generally indicate a h...

Страница 49: ...ing that it has not been calibrated Factory calibration is required for proper radio operation 10 Major The DSP was unable to properly program the system to the ap propriate defaults A hardware proble...

Страница 50: ...e interface connections at the radio and the connected device b Check the antenna feedline and connectors Reflected power should be less than 10 of the forward power reading SWR 2 1 or lower c If the...

Страница 51: ...MDS P N 05 3467A01 1 Program one radio in the network as the root radio by entering the DTYPE ROOT command at the radio 2 At the root radio use the DLINK ON and DLINK baud rate commands to configure t...

Страница 52: ...between the top cover s LED panel and the motherboard You do not need to disconnect the ribbon cable 4 Locate the fuse holder assembly behind the power connector See Figure 17 5 Loosen the fuse from t...

Страница 53: ...instead of downloading it to your local hard drive After the S28 file has been saved to your computer you may use either MDS TransNET Configuration Software or MDS Radio Software Upgrade programs to i...

Страница 54: ...primary again as described in the previous paragraph By default Extensions and the Master begin with XADDR 0 Synchronization qualifiers are set to XMAP 0 XPRI 0 and XRSSI NONE respectively This defau...

Страница 55: ...F operation the Extension radios are set to MODE X Details page 32 and operate with a dual personality 50 of the time it serves as a Remote station and 50 of the time as a Master for sub network Remot...

Страница 56: ...r to completion of retransmissions then this is considered a violation of the polling model protocol The new data takes precedence over the old data and the old data is lost In such a situation new da...

Страница 57: ...ctly to Remotes or through network repeaters the Extensions station The targeted Remote will respond to the poll following the same path back to the Master 9 3 Configuration Parameters for Store and F...

Страница 58: ...rk use the same number Extended Ad dress XADDR Details page 38 A number between 0 and 31 that will serve as a common address for radios that syn chronize directly to this Ex tension radio serving as m...

Страница 59: ...ring 3 An optional encryption value code Setting an encryption code requires the use of the CODE command This command scrambles the radio s hop pattern and encrypts payload data content A radio Table...

Страница 60: ...combination of CODE and ADDR discourage the use of an exhaustive search to gain access to a system The items described above provide sufficient security for a typical MAS system For more highly sensi...

Страница 61: ...Sleep Mode 8 mA 13 8 Vdc Size excluding mtg hardware Enclosed Version 5 30 x 3 50 x 1 40 135 x 89 x 36 mm Board Version 4 00 W x 3 25 x 0 50 102 x 83 x 13 mm Case Die cast aluminum Agency Approvals F...

Страница 62: ...nels away 48 dB Time Required to Synchronize with Master Radio 0 5 seconds typical 10 2 Diagnostic Interface Connections RJ 11 Invisibleplaceholder Figure 20 RJ 11 to DB 9 Adapter Cable Wiring Details...

Страница 63: ...nected device 3 IN TXD Transmitted Data Accepts TX data from the connected device 4 IN Sleep A ground on this pin turns off most circuits in a re mote radio including transmit receive modem and diag n...

Страница 64: ...utput Pin Description 1 Not Used Do not connect 2 OUT TXD TXA Received Data Non inverting driver output 3 IN RXD RXA Transmitted Data Non inverting receiver input 4 IN Sleep GND Active A ground on thi...

Страница 65: ...1 40mW 5 125 32mW 6 115 25mW 7 100 20mW 8 090 16mW 9 080 125mW 10 071 10mW 11 064 12 058 13 050 14 045 15 040 16 0355 dBm mV Po 17 31 5 18 28 5 19 25 1 20 22 5 01mW 21 20 0 22 17 9 23 15 9 24 14 1 25...

Страница 66: ...58 MDS TransNET 900 I O Guide MDS 05 2708A01 Rev B RXD TXD SYN C PWR...

Страница 67: ...l isotropic radiator in free space Frequently used to express antenna gain dBm Decibels referenced to one milliwatt An absolute unit used to measure signal power as in transmitter power output or rece...

Страница 68: ...ata buffer overruns when handling high speed data from the RTU or PLC When the buffer approaches overflow the radio drops the clear to send CTS line which instructs the RTU or PLC to delay further tra...

Страница 69: ...commonly provided through an MAS radio system Standing Wave Ratio See SWR Sub Network A group of TransNET transceivers and the corresponding radio that they are directly synchronized to A sub network...

Страница 70: ...G 4 MDS TransNET 900 I O Guide MDS 05 2708A01 Rev B RXD TXD SYN C PWR...

Страница 71: ...aximum length recommended 15 56 CODE command display set encryption value 29 Commands ADDR set display radio network address 27 AMASK configure alarm output signal 28 ASENSE set display alarm output s...

Страница 72: ...vior 30 Diagnostics network wide performing 43 setup mode SETUP command 35 using InSite software for network wide 43 Display alarm output sense ASENSE command 28 alarms STAT command 37 CTS hold timer...

Страница 73: ...performance optimization 19 requirements 6 site selection 7 site survey 8 tail end links 17 transmission path 7 Interference about 9 checks 21 troubleshooting 42 K Key set to CTS keying DEVICE command...

Страница 74: ...8 as root or node 43 PWR command set display RF forward output power 34 R Radio inoperative troubleshooting chart 42 no synchronization with master troubleshooting chart 42 poor performance troublesho...

Страница 75: ...es 41 antenna system gain vs power output setting 12 DATA INTERFACE connector pin descriptions 55 LED status indicators 19 40 troubleshooting 42 Tail end link cable wiring for illustrated 17 illustrat...

Страница 76: ...RXD TXD SYN C PWR...

Страница 77: ...board repairs The factory is best equipped to diagnose repair and align your radio to its proper operating specifications If return of the equipment is necessary you will be issued a Service Request...

Страница 78: ...Microwave Data Systems Inc Rochester NY 14620 General Business 1 585 243 9600 FAX 1 585 242 9620 Web www microwavedata com 175 Science Parkway A product of Microwave Data Systems Inc...

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