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MDS 05-3301A01, Rev. C

MDS 9810 Installation and Operation Guide

8.6 dBm-Watts-Volts Conversion Chart

Table 16 is provided as a convenience for determining the equivalent
voltage or wattage of an RF power expressed in dBm.

Table 16. dBm-Watts-Volts Conversion—for 50 ohm Systems

9.0

GLOSSARY OF TERMS

If you are new to spread spectrum radio, some of the terms used in this
guide may be unfamiliar. The following glossary explains many of these
terms and will prove helpful in understanding the operation of the trans-
ceiver.

dBm V

+53

100.0 200W

+50

70.7

100W

+49

64.0

80W

+48

58.0

64W

+47

50.0

50W

+46

44.5

40W

+45

40.0

32W

+44

32.5

25W

+43

32.0

20W

+42

28.0

16W

+41

26.2

12.5W

+40

22.5

10W

+39

20.0

+38

18.0

6.4W

+37

16.0

+36

14.1

+35

12.5

3.2W

+34

11.5

2.5W

+33

10.0

+32

9.0

1.6W

+31

8.0

1.25W

+30

7.10

1.0W

+29

6.40

800mW

+28

5.80

640mW

+27

5.00

500mW

+26

4.45

400mW

+25

4.00

320mW

+24

3.55

250mW

+23

3.20

200mW

+22

2.80

160mW

+21

2.52

125mW

+20

2.25

100mW

+19

2.00

80mW

+18

1.80

64mW

+17

1.60

50mW

+16

1.41

40mW

+15

1.25

32mW

+14

1.15

25mW

+13

1.00

20mW

+12

.90

16mW

+11

.80

12.5mW

+10

.71

10mW

.64

8mW

.58

6.4mW

.500

5mW

.445

4mW

.400

3.2mW

.355

2.5mW

.320

2.0mW

.280

1.6mW

.252

1.25mW

dBm V

.225

1.0mW

-1

.200

.80mW

-2

.180

.64mW

-3

.160

.50mW

-4

.141

.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

-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

12.8

-26

11.5

-27

10.0

-28

8.9

-29

8.0

-30

7.1

.001mW

-31

6.25

-32

5.8

-33

5.0

-34

4.5

-35

4.0

-36

3.5

-37

3.2

-38

2.85

-39

2.5

-40

2.25

.1µW

-41

2.0

-42

1.8

-43

1.6

-44

1.4

-45

1.25

-46

1.18

-47

1.00

-48

0.90

dBm mV

-49

0.80

-50

0.71

.01µW

-51

0.64

-52

0.57

-53

0.50

-54

0.45

-55

0.40

-56

0.351

-57

0.32

-58

0.286

-59

0.251

-60

0.225 .001µW

-61

0.200

-62

0.180

-63

0.160

-64

0.141

dBm µV

-65

128

-66

115

-67

100

-68

-69

-70

.1nW

-71

-72

-73

-74

-75

-76

-77

-78

-79

-80

22.5

.01nW

-81

20.0

-82

18.0

-83

16.0

-84

11.1

-85

12.9

-86

11.5

-87

10.0

-88

9.0

-89

8.0

-90

7.1

.001nW

-91

6.1

-92

5.75

-93

5.0

-94

4.5

-95

4.0

-96

3.51

-97

3.2

dBm µV

-98

2.9

-99

2.51

-100

2.25

.1pW

-101

2.0

-102

1.8

-103

1.6

-104

1.41

-105

1.27

-106

1.18

dBm nV

-107

1000

-108

900

-109

800

-110

710

.01pW

-111

640

-112

580

-113

500

-114

450

-115

400

-116

355

-117

325

-118

285

-119

251

-120

225

.001pW

-121

200

-122

180

-123

160

-124

141

-125

128

-126

117

-127

100

-128

-129

.1ƒW

-130

-131

-132

-133

-134

-135

-136

-137

-138

-139

-140

.01ƒW

Содержание MDS 9810

Страница 1: ...Installation and Operation Guide Installation Operation Guide MDS 05 3301A01 Rev C JULY 2004 900 MHz Spread Spectrum Data Transceivers Microwave Data Systems Inc MDS 9810 ...

Страница 2: ...asic configuration with a Hand Held Terminal HHT Set the baud rate data interface parameters as follows Use the BAUD xxxxx abc command where xxxxx equals the data speed and abc equals the communication parameters as follows a Data bits 7 or 8 b Parity N for None O for Odd E for Even c Stop bits 1 or 2 Example BAUD 9600 8N1 NOTE 7N1 8E2 and 8O2 are invalid data parameters 5 Verify proper operation ...

Страница 3: ...ernative Method 6 2 3 Accessories 7 3 0 INSTALLATION PLANNING 7 3 1 General Requirements 7 3 2 Site Selection 8 Terrain and Signal Strength 9 Conducting a Site Survey 9 3 3 A Word About Radio Interference 10 3 4 Antenna Feedline Selection 11 Antennas 11 Feedlines 12 3 5 How Much Output Power Can be Used 13 Transmitter Power vs Antenna System Gain 13 4 0 INSTALLATION 14 4 1 Transceiver Installation...

Страница 4: ...nterference Checks 28 6 0 PROGRAMMING 28 6 1 Hand Held Terminal Connection Start up 28 6 2 Hand Held Terminal Setup 29 6 3 Keyboard Commands 30 Entering Commands 30 Error Messages 31 6 4 Detailed Command Descriptions 35 ADDR 1 65000 36 AMASK 0000 0000 FFFF FFFF 36 ASENSE HI LO 36 BAUD xxxxx abc 36 BUFF ON OFF 37 CTS 0 255 37 CTSHOLD 0 6000 38 DEVICE DCE CTS KEY 38 DLINK xxxxx 39 DMGAP xx 39 DTYPE ...

Страница 5: ...61 Connecting a PC 62 Upgrading the Radio s Software 62 8 6 dBm Watts Volts Conversion Chart 63 9 0 GLOSSARY OF TERMS 63 Copyright Notice This Installation and Operation Guide and all software described herein are protected by copy right 2004 Microwave Data Systems Inc All rights reserved Microwave Data Systems reserves its right to correct any errors and omissions in this document Operational Saf...

Страница 6: ...d C22 2 No 142 M1987 Process Control Equipment CSA Std C22 2 No 213 M1987 Non Incendive Electrical Equipment for Use in Class I Division 2 Hazardous Locations ANSI UL Std No 508 Industrial Control Equipment UL Std No 1604 Electrical Equipment for Use in Class I and II Division 2 Class III Hazardous Clas sified Locations ISO 9001 Registration Microwave Data Systems adherence to this internationally...

Страница 7: ...a Systems may void the user s authority to operate this device Furthermore this device is indented to be used only when installed in accordance with the instruc tions outlined in this manual Failure to comply with these instructions may also void the user s authority to operate this device Manual Revisions Updates While every reasonable effort has been made to ensure the accuracy of this manual pr...

Страница 8: ...vi MDS 9810 Installation and Operation Guide MDS 05 3301A01 Rev C ...

Страница 9: ...ance communications even in the presence of weak signals or interference DSP technology also makes it possible to obtain information about radio operation and troubleshoot problems without going to the remote radio site Using the 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 Performing Netw...

Страница 10: ...supported data rates 1200 2400 4800 9600 19200 38400 bps asynchronous Same hardware for master or remote configuration Data latency typically less than 10 ms Supports EIA 232 formerly called RS 232 user interface Low current consumption 30 mA or less average draw in sleep mode Model Configuration Codes The radio model number is printed on the end of the radio enclosure and provides key information...

Страница 11: ... is required to install and operate this type of radio system 2 2 Typical Applications Multiple Address Systems MAS This is the most common application of the 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 coll...

Страница 12: ...al details for peer to peer systems are provided in Section 4 2 Page 19 Invisible place holder Figure 4 Typical simplex Peer to Peer Network Peer to Peer with Repeater Assistance Peer to peer communication is also possible using this alternate arrangement see Figure 5 It overcomes the range limitations of a sim plex peer to peer system by using a repeater to re transmit the signals of all stations...

Страница 13: ...utlying site is blocked from the MAS master station by a natural or man made obstruction In this arrangement an MDS 9810 radio links the outlying remote site into the rest of a licensed MAS system by sending data from that site to an asso ciated MDS 9810 installed at one of the licensed remote sites See Figure 7 As the data from the outlying site is received at the licensed remote site it is trans...

Страница 14: ...adio Repeater Alternative Method A repeater may also be established using a single MDS x810 Trans ceiver This type of repeater cannot operate in full duplex mode as with the traditional repeater described above However if a loss in transmis sion speed and efficiency can be tolerated it may be a viable solution in some systems P O I N T T O P O I N T S P R E A D S P E C T R U M L I N K REMOTE RADIO...

Страница 15: ... the correct inter face between the transceiver and the data device Table 1 Accessories Accessory Description MDS P N Power Supply Kit For powering the transceiver from an AC source 01 3682A01 Hand Held Terminal Kit HHT Terminal that plugs into the radio s RJ 11 DIAG NOSTICS connector Allows radio programming diagnostics control Includes carrying case cable set and manual 02 1501A01 RTU Simulator ...

Страница 16: ...equate and stable primary power Suitable entrances for antenna interface or other required cabling Antenna location that provides an unobstructed transmission path in the direction of the associated station s These requirements can be quickly determined in most cases A possible exception is the last item verifying that an unobstructed transmission path exists Radio signals travel primarily by line...

Страница 17: ...that can be tolerated in a given system Although the exact figure will differ from one system to another a Received Signal Strength Indication RSSI of 90 dBm or stronger will provide acceptable performance in many systems While the equipment will work at lower signal strengths this provides a fade margin to account for variations in signal strength which may occur from time to time RSSI can be mea...

Страница 18: ...cation and some level of interference should be expected However the radio s flexible design and hopping techniques should allow adequate performance as long as care is taken in choosing station location configuration of radio parameters and software protocol techniques In general keep the following points in mind when setting up your com munications network 1 Systems installed in rural areas are ...

Страница 19: ...tput of all radios in a system should be set for the low est level necessary for reliable communications This lessens the chance of causing unnecessary interference to nearby systems 3 4 Antenna Feedline Selection Antennas The equipment can be used with a number of antennas The exact style used depends on the physical size and layout of a system Contact your MDS representative for specific recomme...

Страница 20: ...e holder Figure 11 Typical Yagi Antenna mounted to mast Feedlines The choice of feedline used with the antenna should be carefully consid ered Poor quality coaxial cables should be avoided as they will degrade system performance for both transmission and reception The cable should be kept as short as possible to minimize signal loss For cable runs of less than 20 feet 6 meters or for short range t...

Страница 21: ...o determine the maximum allowable power setting of the radio follow the steps below It is imperative that professional system planning include cable loss or attenuators to ensure that the FCC IC limit of 36 dBm EIRP is not exceeded under any circumstances 1 Determine the antenna system gain by subtracting the feedline loss in dB from the antenna gain in dBi For example if the antenna gain is 9 5 d...

Страница 22: ...o dBi add 2 15 dB Feedline loss varies by cable type and length To determine the loss for common lengths of feedline see Table 2 on Page 13 4 0 INSTALLATION Figure 12 shows a typical transceiver product shipment along with an optional Hand Held Terminal HHT Check the contents against the packing list secured to the outside of the shipping box Accessories and spare parts kits if any are wrapped sep...

Страница 23: ...It is recommended that the master station be installed first In this way it will be possible to quickly check the operation of each associated remote station as it is placed on the air 4 1 Transceiver Installation 1 Mount the transceiver to a stable surface using the brackets supplied with the radio Fasteners anchors are not supplied Figure 13 shows the dimensions of the transceiver case and its m...

Страница 24: ...ontained in Section 3 4 Page 11 NOTE Strong fields near the antenna can interfere with the operation of the low level RTU circuits and change the reported values of the data being monitored For this reason the antenna should be mounted at least 10 feet 3 meters from the radio RTU sensors and other components of the system 3 Connect the data equipment to the transceiver s DATA INTERFACE connector U...

Страница 25: ...systems Additionally the chassis must be bonded to an Earth ground either directly through its mounting bracket or via the antenna system ground coaxial shield The radio may be damaged if the chassis is not properly grounded per this recommendation Radios damaged in this way will not be covered under warranty The power supply used with the transceiver should be equipped with overload protection NE...

Страница 26: ...re normally shipped from the factory pre configured as remotes A master must be specifically programmed using the MODE M command Invisible place holder Figure 15 HHT Connected to Transceiver c Program the network address Type ADDR Page 36 followed by and then the desired address number 1 65000 Press All radios in a given system must be programmed with the same network address After programming the...

Страница 27: ...ix it to the transceiver cover 6 Repeat the above steps for each transceiver in the network This completes the basic installation of the transceiver Section 5 1 Ini tial Start up beginning on Page 26 contains steps for evaluating radio performance 4 2 Peer to Peer Systems Peer to peer systems allow remote radios to communicate with each other as well as with the master station The paragraphs below...

Страница 28: ...the RTU s Data Carrier Detect DCD pin Peer to Peer with Repeater Assistance A shortcoming of a simplex peer to peer network is that communication range is often reduced because of the need for all stations to use omni directional antennas An alternative peer to peer network can be estab lished using a repeater station to re transmit the signals of all stations in the network See Figure 16 Because ...

Страница 29: ...parated by at least 10 feet 3 2 Meters This takes advantage of the minimal radiation exhibited by verti cally polarized antennas directly above and below one another Full Duplex Configuration The paragraphs above discuss the requirements for a basic Repeater Assisted Peer to Peer system If a full duplex system is required with the SCADA host computer located at the repeater additional consideratio...

Страница 30: ...that would otherwise be unable to communicate with the master station due to distance or terrain A repeater works by re transmitting data from the outlying remote site to the master station and vice versa It introduces a small amount of end to end transmission delay but this is not a problem in most systems The geographic location of a repeater station is especially important A site must be chosen...

Страница 31: ...is used System Addresses The two radios that are wired together at the repeater site must have dif ferent system addresses To set or view the system address see ADDR 1 65000 on page 36 Interface Wiring A null modem cable Figure 19 is required between the DATA INTER FACE connectors of the two radios forming a repeater station This allows them to freely exchange data even though they are both config...

Страница 32: ...requirements for single radio repeater systems Interface Wiring A single radio repeater is formed by connecting TXD Pin 2 and RXD Pin 3 on the DATA INTERFACE connector together as shown in Figure 20 Invisible place holder Figure 20 Data Interface Cable Wiring for Single Radio Repeater Software Programming TDD Command As with other repeater systems the network must be configured for TDD operation b...

Страница 33: ...und or EIA 232 low on Pin 12 of the radio s DATA INTERFACE connector The radio stays in Sleep Mode until the low is removed and all normal func tions are suspended As a status indication the radio s PWR LED flashes once every four seconds to indicate that it is in Sleep Mode The radio can be woken up by your RTU every minute or so to verify synchronization with the master station When Pin 12 is op...

Страница 34: ... and receiving data RXD with the master station Invisible place holder Figure 21 LED Status Indicators 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 given here The effectiveness of these techniques will vary with the design of your system and the format of the data being sent PWR SYNC TXD ...

Страница 35: ...ach remote in turn Antenna SWR Check It is necessary to briefly key the transmitter for this check by placing the radio in the SETUP mode Page 44 and using the KEY command on the HHT To unkey the radio enter DKEY to disable the setup mode and return the radio to normal operation enter Q or QUIT The SWR of the antenna system should be checked before the radio is put into regular service For accurat...

Страница 36: ...ROGRAMMING There are no manual adjustments on the transceiver Programming and control is performed remotely using one of these methods MDS Hand Held Terminal P N 02 1501A01 MDS Radio Configuration Software P N 03 3156A01 MDS Network Management Software This manual describes control of the radio using the Hand Held Ter minal HHT Instructions for using the other methods are contained in their respec...

Страница 37: ...eep press to receive the ready prompt 6 2 Hand Held Terminal Setup The following is a set of instructions for re initializing an HHT for use with the transceiver These steps may be required if the HHT was previ ously used with a different radio or if the HHT default settings have been inadvertently altered 1 Plug the HHT into the DIAG NOSTICS connector Enable the setup mode by pressing the and key...

Страница 38: ...eyboard Commands Table 6 is a reference chart of software commands for the transceiver See Section 6 4 for detailed command descriptions Entering Commands The proper procedure for entering commands is to type the command followed by an keystroke For programming commands the command is followed by and the appropriate information or values then Z E A Table 5 HHT Operational Settings Parameter Settin...

Страница 39: ...mand was not recognized INCORRECT ENTRY Command format or its arguments invalid COMMAND FAILED Command was unable to complete success fully Possible software problem NOT PROGRAMMED Software was unable to program the EEPROM or the requested display item was not programmed TEXTTOO LONG Response to OWN or OWM command when too many characters have been entered NOT AVAILABLE The entered command or para...

Страница 40: ...lf duplex selection ON simplex OFF half duplex SKIP NONE 1 8 Details Page 46 Select combination of frequency operating zones to avoid SKIPSYNC ON OFF Details Page 46 May be used to suppress transmission of SYNC messages in skipped zones See also SKIP command Default setting is OFF TDD ON OFF Details Page 47 Sets or displays time division multiplex status of DATA INTERFACE connector Sometimes refer...

Страница 41: ...mote radio programmed to operate on Master fre quencies OWM xxxxx Details Page 42 Program owner s message 30 characters maximum OWN xxxxx Details Page 42 Program owner s name 30 characters maximum PWR xx 30 Details Page 42 Program forward power output in dBm RTU ON OFF 0 80 Details Page 43 Re enables or disables the radio s internal RTU simulator and sets the RTU address RXTOT NONE 0 1440 Details ...

Страница 42: ...41 Show operating mode M Master R Remote R M Remote Master remote oper on master freqs OWM Owner s message or site name OWN Owner s name or system name PWR xx 30 Details Page 42 Forward power output setting in dBm RSSI Details Page 42 Received signal strength in dBm continuously updated Not available at master radio unless SETUP is enabled RXTOT NONE 0 1440 Details Page 43 Specifies amount of time...

Страница 43: ... dB SREV Details Page 47 Display transceiver firmware revision level STAT Details Page 47 Show current alarm status TDD ON OFF Details Page 47 Sets or displays time division multiplex status of DATA INTERFACE connector Sometimes referred to as simulated full duplex mode TEMP Details Page 48 Transceiver s internal temperature C UNIT 10000 65000 Details Page 48 Show programmed unit address for net w...

Страница 44: ... command The default is FFFF FFFF Through proper use of the AMASK command it is possible to tailor the alarm response of the radio Contact the factory for more information on configuring the alarm mask ASENSE HI LO This command is used to set or display the sense of the alarm output at Pin 25 of the DATA INTERFACE connector The default for transceivers is active HI BAUD xxxxx abc This command sets...

Страница 45: ... the outgoing data flow If data buffering is ON the radio will operate in a seamless mode That is data bytes will be sent over the air as quickly as possible but the receiver will buffer the data until enough bytes have arrived to cover worst case gaps in transmission The delay introduced by data buffering may range from 25 to 50 ms but the radio will not create any gaps in the output data stream ...

Страница 46: ...to 6000 i e 6 seconds The default value is 0 which means that CTS will drop immediately after the last character is transmitted If the command is entered when the radio is in DEVICE DCE mode the response CTSHOLD N A will be displayed DEVICE DCE CTS KEY The DEVICE command sets or displays the device behavior of the radio The command parameter is either DCE or CTS KEY The default selection is DCE In...

Страница 47: ...of a new poll When diagnostics is being performed using passive messaging see Performing Net work Wide Remote Diagnostics on page 53 this command may be used to change this behavior DTYPE NODE ROOT GATE PEER The DTYPE command specifies the radio s operational characteristics for network wide diagnostics There are four possible types of nodes in a network wide diagnostics system The common types ar...

Страница 48: ...L and LONG are the only settings required Other hoptimes can be used to customize performance based on SEND count settings and payload data poll length The only time shorter settings SHORT through XSHORT should be con sidered is when the message size is very small and strong interference of a persistent nature is occurring on many frequencies In these cases a shorter hop time may improve the chanc...

Страница 49: ...is designated by an M a remote is designated by an R Table 8 Factory Default Values Produced by INIT Command Default Setting Corresponding Command For all radios Device operation DCE DEVICE DCE RF output power 30 dBm 1 watt PWR 30 CTS delay 0 CTS is continuously asserted CTS 0 DATA INTERFACE port 4800 baud 8 data bits no parity 1 stop bit BAUD 4800 8N1 Remote radios Transmitter test frequency Per ...

Страница 50: ...o read the actual measured power output of the radio use the SHOW PWR command In the USA and Canada maximum allowable power is governed by limits on Effective Isotropic Radiated Power output EIRP The EIRP limit of 36 dBm means that any user with a net antenna gain greater than 6 dBi must decrease the PWR setting accordingly Section 3 5 How Much Output Power Can be Used beginning on Page 13 contain...

Страница 51: ...s that the radio will respond to The internal RTU can be used for testing system payload data or pseudo bit error rate BER testing It can be helpful in isolating a problem to either the external RTU or the radio RX xxxx This command sets or displays the test receive frequency used in place of hopping whenever the radio is in Setup mode The test receive fre quency can be reprogrammed to any value b...

Страница 52: ...cal delta n or n to the base transmission count for the network The net transmission count is automatically bounded to the range 1 10 irrespective of the delta The combination of the two formats provides a means to highly cus tomize the retransmission behavior of network Higher retransmission counts come at the cost of increased latency and reduced data throughput With BUFF ON the radio maintains ...

Страница 53: ...e for diagnostics and control DC Displays DC input output voltages PWR Displays the actual measured RF power output in dBm Unlike the PWR command this command shows the actual level being measured not the programmed RF power setting SIMPLEX ON OFF The SIMPLEX command sets or displays the radio s mode of operation simplex or half duplex By default the system operates in half duplex mode SIMPLEX OFF...

Страница 54: ... zones see SKIP command above With SKIPSYNC set to ON the trans ceiver will not transmit SYNC messages in skipped frequency zones This command is only available to transceivers that are set to be a master MODE M The default setting for this command is OFF NOTE Using SYNCSKIP when many zones are skipped will signifi cantly lengthen the time it takes a remote to achieve synchro nization with the mas...

Страница 55: ...MS PRESENT appears at the top of the HHT display If an alarm does exist a two digit event code 00 31 is displayed and the 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 at the bottom of the screen and additional alarms are viewed by pressing the key Detailed descriptions of the alarm codes are provide...

Страница 56: ...requency used in place of hopping whenever the radio is in Setup mode The test transmit fre quency can be reprogrammed to any value between 902 025 MHz and 927 975 MHz inclusive The factory default settings are listed below and have been selected to be non intrusive to normal system operation UNIT 10000 65000 This command sets the unit addressing for network wide diagnostics The unit address is fa...

Страница 57: ... should con sider skipping those zones using the SKIP command The ZONE DATA command displays its information on four lines as shown in Figure 25 If the display seems to roll off the screen verify that your HHT is set for an 80 character screen size See Section 6 2 Hand Held Terminal Setup beginning on Page 29 Invisible place holder Figure 25 HHT Display for ZONE DATA Command If ZONE DATA alone is ...

Страница 58: ...g of an MDS transceiver system is not diffi cult but requires a logical approach It is best to begin troubleshooting at the master station as the rest of the system depends on the 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 practice to begin by check...

Страница 59: ...ther abnormal condition that will prevent or seriously hamper further operation of the transceiver With the exception of alarm code 00 network address not pro grammed major alarms generally indicate the need for factory repair Contact MDS for further assistance Minor alarms report conditions which under most circumstances will not prevent transceiver operation This includes out of tolerance condi ...

Страница 60: ...use 12 Major Receiver time out alarm 13 15 Reserved for factory use 16 Minor The unit address is not programmed 17 Minor A data parity fault has been detected on the DATA INTERFACE connector This usually indicates a parity setting mismatch between the radio and the RTU 18 Minor A data framing error has been detected on the DATA INTERFACE connector This may indicate a baud rate mismatch between the...

Страница 61: ...n the network intrusive polling polling which briefly interrupts payload data transmission can be per formed To perform diagnostics without interrupting payload data trans mission connect the PC to a radio defined as the root radio A radio is defined as a root radio using the DTYPE ROOT command locally at the radio RTU RTU TO DIAGNOSTICS PORT TO DATA PORT REPEATER POLLING REMOTE ROOT NODE REMOTE N...

Страница 62: ...at the radios diagnostic ports 6 Connect a PC on which MDS Network Management Software is installed to the root radio or to one of the nodes at the radio s diag nostic port This PC may be the PC being used to collect payload data as shown in Figure 30 To connect a PC to the radio s DIAG port an RJ 11 to DB 9 adapter MDS P N 03 3246A01 is required If desired an adapter cable may be constructed from...

Страница 63: ...gnostics There are four possible types of nodes in a network wide diagnostics system The common types are NODE The most common setting and the default This is the basic system radio device type Typically the radio network is comprised of nodes and one root Intrusive diagnostics can orig inate from any node However non intrusive diagnostics can not be facilitated through a node ROOT Always one and ...

Страница 64: ...entarily remove and re apply power to the radio Interference is suspected a Verify that the system has a unique network address Nearby systems with the same address will cause interference b Use the ZONE DATA command Page 49 to check for interference in specific zones Lock out affected zone s using the SKIP command Page 46 c If omnidirectional antennas are used on remote stations consider changing...

Страница 65: ...Div 2 Groups A B C and D hazardous locations Contact MDS for information on availability and governmental approvals in other countries DATA CHARACTERISTICS Data Interface EIA 232 signaling standard Interface Connector DB 25 female Data Rate 1200 2400 4800 9600 19200 38400 bps asynchronous Data Latency 10 ms typical buffer off Byte Length 10 or 11 bits Maximum Data Transmission Continuous up to 192...

Страница 66: ...ween RSSI and the dc voltage at Pin 21 NOTE RSSI Readings are not accurate for incoming signals stronger than 50 dBm Invisible place holder Figure 28 RSSI vs Vdc at Pin 21 of DATA INTERFACE Connector 8 3 Data Interface Connections DB 25 The DATA INTERFACE connector is used to connect the radio to an external DTE data terminal that supports the EIA 232 format The radio supports data rates of 1200 2...

Страница 67: ...e radio s PC board and chassis 2 IN TXD Transmitted Data Accepts TX data from the connected device 3 OUT RXD Received Data Supplies received data to the connected device 4 IN RTS Request to Send Input 5 OUT CTS Clear to Send Output Goes high after the programmed CTS delay time has elapsed DCE or keys an attached radio when RF data arrives CTS KEY 6 OUT DSR Data Set Ready Provides a 6 Vdc DSR signa...

Страница 68: ...al Strength Indication A dc voltmeter may be connected to this pin to read the relative strength of the incoming signal Figure 28 on page 58 compare RSSI to dc voltage 22 Unused 23 IN Diagnostic Channel Enable A ground on this pin causes the radio s microcontroller to open the DB 25 DATA INTERFACE connector for diagnostics and control in place of the more commonly used RJ 11 DIAG NOSTICS connector...

Страница 69: ... Bench Testing of Radios 8 5 Using Radio Configuration Software Windows based Radio Configuration software MDS P N 03 3156A01 is used for upgrading the internal radio software when new features become available from Microwave Data Systems The software includes on line user instructions and an installation booklet is provided with the software package Contact MDS for ordering information NOTE The l...

Страница 70: ...ll flash rapidly confirming that a download is in process The download takes about two minutes NOTE If a download fails the radio is left unprogrammed and inop erative This is indicated by the PWR LED flashing slowly 1 second on 1 second off This condition is only likely to occur if there is a power failure to the computer or radio during the downloading process The download can be attempted again...

Страница 71: ...45 4mW 5 400 3 2mW 4 355 2 5mW 3 320 2 0mW 2 280 1 6mW 1 252 1 25mW dBm V Po 0 225 1 0mW 1 200 80mW 2 180 64mW 3 160 50mW 4 141 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 12 8 26 11 5 27 10 0 28 8 9 29 8 0 30 7 1 001mW 31 6 25 32 5 8 33 5 0 34 4...

Страница 72: ...terminating Equipment See DCE Data Communications Equipment See DCE Data Terminal Equipment See DTE dBi Decibels referenced to an ideal 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 received signal strength DCE Data Circuit terminating Equipment or Dat...

Страница 73: ...e Flow Control A transceiver feature used to prevent data 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 transmis sion until CTS again returns to the high state Host Computer The computer installed at the master station site which controls the collection...

Страница 74: ... terminal equipment Poll A request for data issued from the host computer or master PLC to a remote radio PLC Programmable Logic Controller A dedicated microprocessor configured for a specific application with discrete inputs and outputs It can serve as a host or as an RTU Remote Radio A radio in a spread spectrum network that communi cates with an associated master station A radio may be programm...

Страница 75: ...port attributes 36 BUFF set display received data handling mode 37 CTS set display CTS line response timer 37 CTSHOLD set display CTS hold timer 38 detailed descriptions 32 50 DEVICE set display DCE or CTS Key behavior 38 display operating status 34 DLINK set display baud rate of diagnostics link 39 DMGAP set time to wait between characters 39 DTYPE set radio s diagnopstics type 39 entering on Han...

Страница 76: ...tics type 39 54 55 E EEPROM FAILURE error message 32 Enable diagnostics channel by grounding Pin 23 of HHT cable 29 HHT setup mode 29 internal RTU RTU command 43 master remote operation MODE command 41 network wide diagnostics procedures 54 Setup mode SETUP command 44 simplex half duplex operation SIMPLEX command 45 skipped zone SKIP command 46 Sleep Mode 25 Equalization defined 64 Error messages ...

Страница 77: ... installation 19 with repeater assistance illustrated 5 20 Performance optimization 26 Pins DATA INTERFACE connector descriptions table 59 PLC Programmable Logic Controller defined 66 Point to multipoint system defined 66 power usage 13 Point to point system link illustrated 5 Poll defined 66 Power how much can be run 13 measuring and installing primary 17 set display RF forward output PWR command...

Страница 78: ...splay active port dc volts measured power output 45 Simplex installing peer to peer system 19 peer to peer network illustrated 4 SIMPLEX command set display simplex half duplex operation 45 Single radio repeater 24 Site selection 8 SKIP command set display frequency zone to skip 46 SKIPSYNC set display status of SYNC messages in skipped zones 46 Sleep mode 25 SNR command display signal to noise ra...

Страница 79: ...radio to its proper operating specifications If return of the equipment is necessary you will be issued a Service Request Order SRO number The SRO number will help expedite the repair so that the equipment can be repaired and returned to you as quickly as possible Please be sure to include the SRO number on the outside of the ship ping box and on any correspondence relating to the repair No equipm...

Страница 80: ...Microwave Data Systems Inc Rochester NY 14620 General Business 1 585 242 9600 FAX 1 585 242 9620 Web www microwavedata com 175 Science Parkway A product of Microwave Data Systems Inc ...

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