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ENC-900 Operating Manual: Chapter 2 Electrical/Physical

 

11

 

Signal strength, which is also reported in Register S123, is calculated based 
on the last four valid received packets with correct CRC, and represented by 
RSSI1, 2 and 3. 
For Remotes, packets are received on every single hop either from a repeater, 
or the master. 
When calculating RSSI, the master takes into consideration all packets 
received from Remotes and repeaters.  Repeaters and Remotes only transmit 
back to the master when they have information to send.  Therefore, if no data 
is coming back to the master then RSSI will never get updated at the master, 
and the LED’s will be off. 
 

Signal Strength 

(dBm) 

RSSI1 RSSI2 RSSI3 

-95 50% 

duty 

cycle off 

off 

-90 on 

solid off  off 

-85 

on solid 

50% duty cycle 

off 

-80 

on solid 

on solid 

off 

-75 

on solid 

on solid 

50% duty cycle 

-70 

on solid 

on solid 

on solid 

 

Table 3 - RSSI mode operation 

Содержание ENC-900

Страница 1: ...el ENC 900 900 MHz Spread Spectrum OEM Transceiver Revision 1 00 February 23 2005 Encom Wireless Data Solutions Inc 7 640 42nd Ave N E Calgary Alberta T2E 7J9 Phone 403 230 1122 Fax 403 276 9575 http www encomwireless com ...

Страница 2: ...testing of the transmitter is required as long as the 20 cm separation and co location requirements are observed Each new use of the module will however always need to be scanned for unintentional radiation from digital clocks etc All necessary calibration has been performed at the time of manufacture Any modification of the device after it leaves the factory is a violation of FCC rules Compliance...

Страница 3: ...ot cause harmful interference and 2 This device must accept any interference received including interference that may cause undesired operation Contains TX FCC ID PLQENC900 Canada 3966A ENC900 S N XXXYYYZZZ MODEL ENC 900 Made in Canada The label should be printed or molded into the case using a type front and size that is readable with the unaided eye The FCC identification number is required Indu...

Страница 4: ...ns where failure could result in damage to property or human injury or loss of life The electronic equipment described in this manual generates uses and radiates radio frequency energy Operation of this equipment in a residential area may cause radio interference in which case the user at his own expense will be required to take whatever measures necessary to correct the interference FCC Declarati...

Страница 5: ...ult Codes display 20 W Connection Result 21 Z Reset and load stored configuration 21 C DCD Data Carrier Detect 21 D DTR Data Terminal Ready 21 F Load Factory Default Configuration 21 K Handshaking 22 S DSR Data Set Ready 22 V View Configuration 22 E Framing Error Check 22 W Write Configuration to Memory 22 Sxxx Read S register value 22 Sxxx yyy Set S register value 22 AT Command Result Codes 22 4 ...

Страница 6: ...ming 33 S Register 119 Quick Enter to Command 34 S Register 120 RTS DCD Framing 34 S Register 121 DCD Timeout 34 S Register 123 Remote RSSI Reading 35 S Register 124 Master RSSI Reading 35 S Register 213 Packet Retry Limit 35 4 4 Diagnostics Statistics and Remote Control 36 4 4 1 Spectrum Analyzer Feature ATG 36 4 4 2 Statistics ATP 36 4 4 3 Remote Control and Diagnostics S101 5 37 A Modem Command...

Страница 7: ... reliability 1 1 Features Key features of the ENC 900 include transmission within a public license exempt band of the radio spectrum1 this means that it can be used without access fees such as those incurred by cellular airtime a serial I O data port with handshaking and hardware flow control allowing the ENC 900 to interface directly to any equipment with an asynchronous serial interface 64 sets ...

Страница 8: ... 4 provides complete details of all configuration parameters The Appendices including the Glossary of Terms are provided as informational references which you may find useful throughout the use of this manual as well as during the operation of the wireless modem Throughout the manual you will encounter not only illustrations that further elaborate on the accompanying text but also several symbols ...

Страница 9: ...ENC 900 Operating Manual Chapter 2 Electrical Physical 5 ...

Страница 10: ...PHYSICAL 2 0 Functional Block Diagram Transceiver Intrgrated Circuit Lowpass Filter Bandpass Filter Bandpass Filter Power Amplifier T R Switch Lowpass Filter 39 00 MHz Crystal Microcontroller Host Connector 32 768 kHz Crystal 6 10 Figure 1 Functional Block Diagram ...

Страница 11: ...level input I 6 CTS RS 232 Clear to Send Active low TTL level output O 7 RTS RS 232 Request to Send Active low TTL level output I 8 DSR RS 232 Data Set Ready Active low TTL level output O 9 RSSI1 Receive Signal Strength Indicator 1 This output is the first of the three RSSI indicators to become active high as the signal strength increases O 10 RSSI2 Receive Signal Strength Indicator 2 This output ...

Страница 12: ... In order to maintain compliance with the FCC modular certification it is necessary to mount the module in such a way that user is never closer than 20 cm to the antenna The manual for end users of the product must contain a warning about the 20 cm separation as outlined in the beginning of this manual Additionally the transceiver may not be co located with any other antenna or transmitter ...

Страница 13: ...The most common method for installing the module is to run a short RF Jumper cable from the module s MCX connector to a reverse TNC bulkhead connector on the chassis of the equipment as shown in the following figure These cables can be purchased from Encom Wireless Data Solutions Inc RG174 Cable with MCX male connector and Reverse TNC bulkhead connector Reverse TNC Connector MCX female connector C...

Страница 14: ...ode Master RSSI mode based on all received packets See Table 3 Data Mode Repeater During Sync Acquisition alternating 300ms ON Data Mode Repeater When Synchronized RSSI mode based on packets received from Remotes See Table 3 Data Mode Remote During Sync Acquisition alternating 300ms ON Data Mode Remote When Synchronized RSSI mode based on packets received from the Repeater or Master with which it ...

Страница 15: ...RSSI the master takes into consideration all packets received from Remotes and repeaters Repeaters and Remotes only transmit back to the master when they have information to send Therefore if no data is coming back to the master then RSSI will never get updated at the master and the LED s will be off Signal Strength dBm RSSI1 RSSI2 RSSI3 95 50 duty cycle off off 90 on solid off off 85 on solid 50 ...

Страница 16: ...ulated supply for Vcc Radio Do not directly feed a switching power supply into Vcc Radio Caution Using any other power supply which does not provide the proper voltage or current could damage the ENC 900 module 2 5 DC Characteristics Characteristic Min Typ Max Units Supply Voltage 3 80 V Transmit Current at 1W 900 mA Receive Current 28 mA Sleep Current 1 mA ...

Страница 17: ...ENC 900 Operating Manual Chapter 2 Electrical Physical 13 ...

Страница 18: ...reless asynchronous serial communication amongst two or more terminal devices There are three basic elements to any ENC 900 communications network One module configured as the Master Zero or more modules configured as Repeaters One or more modules configured as Remotes The function of the Master is to provide synchronization for the entire network and to control the flow of data There is always on...

Страница 19: ...estriction to the number of Repeaters and Remotes that can be added to a network As seen in Network 4 a Master can communicate directly with both Remotes and Repeaters 3 2 Command Mode The ENC 900 firmware has been designed to allow the user to customize the operation of the modem through an AT Command Interface This interface is ideal for direct interface with another microcontroller or for highe...

Страница 20: ... telephone modem command set All line entries must be preceded by the characters AT The characters AT are known as the attention characters and must be typed at the beginning of each command line For example to change the operating mode type ATS101 2 ENTER The modem should respond with OK The above command will set the operating mode to Master Point to Point Register settings are not immediately s...

Страница 21: ...ata Mode the modem will communicate through the serial port at the same baud rate as was last used in Command Mode2 To return to Command Mode you can either Send the escape sequence The escape sequence consists of 1 second of inactivity followed by the characters followed by another second of inactivity or Toggle the DTR line depending on the D parameter The escape sequence must be issued at the b...

Страница 22: ...e used to quickly configure the modem for a particular type of operation For example to quickly implement Network 1 Factory default 1 would be applied to the Master and Factory default 2 would be applied to the Remote To quickly set up Network 2 apply Factory 1 to the Master Factory 3 to the Repeater and Factory 4 to the Remote These defaults will get you started and only ensure that a link can be...

Страница 23: ...dem As data is sent from Remote to Master the RX indicator should blink on as correct packets of data are received At this point the Master s RSSI LED s should become active It is recommended that if the ENC 900 will be deployed in the field where large distances separate the units the modems should be configured and tested in close proximity e g in the same room first to ensure a good link can be...

Страница 24: ... return E Command Echo Your modem is preset to return or echo commands to the host microprocessor when in Command Mode E0 No Command Echo E1 Command Echo I Identification The I command returns various modem information settings I0 String up to 15 characters stored in non volatile memory I1 Product Code I2 Self Test Result I3 Product Identification Firmware Version I4 Firmware Date I5 Firmware Copy...

Страница 25: ...1 timing is still valid D DTR Data Terminal Ready The D command controls what action the modem performs when the DTR input line is toggled The DTR input is controlled by the host microprocessor D0 DTR line is ignored D1 Not Supported D2 De assert DTR to force the modem into command mode from data mode DTR must be asserted before putting the modem back into data mode The modem is put back into data...

Страница 26: ...k When enabled the modem looks for the stop bit If the stop bit is absent the byte is thrown out When enabled the modem also does a parity check Note that the data format number of data bits parity type and number of stop bits is defined by S register 110 E0 Disable Framing Error Check E1 Enable Framing Error Check W Write Configuration to Memory The W command stores the active configuration into ...

Страница 27: ... to zero the modem will power up in command mode If this register is set to one the modem will power up in data mode S Register 2 Escape Code This register contains the ASCII value of the escape character The default value decimal 43 is equivalent to the ASCII character Values greater than 127 disable the escape feature and prevent you from returning to the Command Mode This register cannot be sto...

Страница 28: ...on for data transmitted by all Remotes and Repeaters In addition the Master defines the following network parameters to be utilized by all other modems in the network See the appropriate sections for a complete description of these parameters Maximum Packet Size S112 Minimum Packet Size S111 Wireless Link Rate S103 Hop Interval S109 2 Master Point to Point This mode of operation provides for commu...

Страница 29: ...S213 4 Repeater A more precise title would be Repeater Remote because a Repeater also has much of the same functionality as a Remote A terminal can be connected at the Repeater location and communicate with the Master terminal There is no restriction to the number of Repeaters in a network allowing for communication over virtually limitless distances The presence of one Repeater in a network autom...

Страница 30: ...4400 7 9600 8 7200 9 4800 10 3600 11 2400 12 1200 It is generally advisable to choose the highest rate that your terminal equipment will handle to maximize performance unless a limitation on the available bandwidth is desired If the DTE is a personal computer the port can usually be used reliably at 115200 Issuing the Fx command factory default does not affect the current setting of S102 S Registe...

Страница 31: ...ty of communications where multiple networks may operate concurrently in close proximity it is suggested that a typical value be chosen perhaps something meaningful yet not easily selected by chance or coincidence Default is 1 S Register 105 Unit Address In point to point operation the Unit Address on both the Master and Remote or Repeater units must be the same In a multipoint system the Unit Add...

Страница 32: ...on below When communicating with the Master R1 is acting like a Remote on Primary Hopping Pattern 1 When communicating with R2 and S4 R1 is acting like a Master on Secondary Hopping Pattern 2 If multiple Repeaters are used they should have different Secondary Hopping Patterns R1 1 2 R2 2 5 S3 5 M 1 S4 2 R5 1 3 R6 3 6 S7 6 R8 1 4 S9 4 Note that all units have a unique Unit Address Networks of any c...

Страница 33: ...n The allowable settings are 0 1 mW 1 10 mW 2 100 mW 3 1000 mW not available for ENC 900L model Ideally you should test the communications performance between units starting from a low power level and working upward until the RSSI is sufficiently high and a reliable link is established Although the conditions will vary widely between applications typical uses for some of the settings are described...

Страница 34: ...6dBi 3 85dBd were to be used the power setting must be adjusted appropriately Violation of FCC regulations can result in severe fines S Register 109 Hopping Interval This option determines the frequency at which the modems change channel Note that the Master controls this parameter for the entire network This setting is ignored in units configured as Remotes or Repeaters The allowable settings are...

Страница 35: ...er and abide by the Master s S111 setting If S114 1 at any particular Repeater or Remote that Repeater or Remote will use its own local S111 setting The default for S111 is 1 byte S Register 112 Maximum Size This setting has a range of 2 to 255 and defines the maximum number of bytes from the DTE which should be encapsulated in a packet This value should be greater than the minimum packet size but...

Страница 36: ...communicating In this case the Master will continue to retransmit until an acknowledgement is received or the retransmission limit is reached When the retransmission limit is reached the Master discards the packet The Master retransmits once at the beginning of each hopping interval until the limit is reached This parameter is not necessary in Remote units since all Remotes receive acknowledgement...

Страница 37: ...ntervals for less frequent transmission or to avoid collisions between many Remotes in the system This register is always disregarded and taken as S115 1 in Point to Point mode S Register 117 Radio Buffer Mode Radio Buffer Mode controls the ENC 900 TX buffer behaviors The allowable settings for this register are 0 High Throughput Mode 1 Quick Turn Around Mode S Register 118 Roaming This mode is ac...

Страница 38: ...CD Framing S Register 121 DCD Timeout The ENC 900 supports two special types of data framing Input or RTS CTS Data Framing and Output or DCD Data Framing Input Data Framing is enabled by configuring the Handshaking Parameter as K2 This type of framing makes use of the S120 parameter as illustrated in Figure 9 Parameter S120 can be set to any value between 0 and 254 ms RTS CTS TXD S120 ms Data goin...

Страница 39: ... Retry Limit Packet Retry Limit is analogous to Packet Retransmissions but specifically applies to Remotes and Repeaters This parameter is not used by the Master Because the Remote has the advantage of receiving acknowledgements from the Master it is not necessary to blindly retransmit each packet If the Remote does not get an acknowledgement on the next hop it will retransmit its packet This will...

Страница 40: ...This feature also displays average received signal strength for 12 channels above the 902 928 MHz ISM band This area of the spectrum is used by paging networks When deploying a network the spectrum analyzer feature is useful for determining which parts of the ISM band may be noisy This knowledge can be used to select an appropriate hopping pattern or for creating a custom hopping pattern which avo...

Страница 41: ...ify Table 4 provides a diagnostics command summary The first column is a list of commands that may be issued at the master The second column is the corresponding remote register In general any command issued without any additional parameters is a read command For example if you type 0 return The remote Remote repeater will send back the value if its S101 register On the Master terminal screen you ...

Страница 42: ...back a test string from remote b x E Framing c x C DCD d x K Handshaking e W Write f S123 RSSI g x S104 Network Address h x S106 Hopping Pattern I x S206 Secondary Hopping Pattern j x S113 Retransmissions k1 statistics Read of data packets sent k2 statistics Read of data packets received k3 statistics Read of Remote s retries k4 statistics Read of Remote s packets dropped k5 statistics Read of Rem...

Страница 43: ... can quickly interrogate modify many different Remote s settings without the delays associated with switching between command and data modes The commands which apply to the master s own registers are shown in Table 5 Table 5 Master Diagnostics Commands Command Master Register Description n x Remote Hop loading p Remote IO string read r x S105 Unit Address s S101 back to normal operating mode t x S...

Страница 44: ...40 ENC 900 Operating Manual Chapter 4 Configuration ...

Страница 45: ...n in data off in command mode V View Configuration W Write configuration to memory Sxx Read S register value Sxx yy Set S register value Result Codes 0 OK 3 NO CARRIER 4 ERROR S Registers S0 Auto Answer 0 255 0 power up in Command Mode non zero power up in Data Mode S2 Escape code 0 255 default S101 Operating Mode 1 Master Point to Multipoint 2 Reserved 3 Remote 4 Repeater S102 Serial Baud Rate 1 ...

Страница 46: ...42 ENC 900 Operating Manual Appendix A Modem Command Summary ...

Страница 47: ...8 0 Quick Enter to Command S119 0 RTS DCD Framing ms S120 5 DCD Timeout ms S121 0 Secondary Hop Pattern S206 2 Packet Retry Limit S213 0 AT F3 Repeater Default Settings E1 Q0 V1 W0 S0 1 S2 43 S3 13 S4 10 S5 8 DCD C2 DTR D0 Framing E0 Handshaking K0 DSR S1 Operating Mode S101 4 Serial Baud Rate S102 5 Wireless Link Rate S103 2 Network Address S104 1 Unit Address S105 3 Primary Hop Pattern S106 0 En...

Страница 48: ...44 ENC 900 Operating Manual Appendix B Factory Default Settings ...

Страница 49: ...r Consumption 900 mA at 1W transmit 28 mA receive and less than 1mA in sleep Operating Frequency 902 928 MHz Sensitivity 103 dBm Output Power 1 10 100 1000mW user selectable Spreading Code Frequency Hopping Hopping Patterns 64 pseudo random user selectable Error Detection CRC 16 with auto re transmit Error Correction User selectable Forward Error Correction FEC Adjacent Channel Rejection 40 dB Out...

Страница 50: ...46 ENC 900 Operating Manual Appendix C Technical Specifications ...

Страница 51: ...erformed by using a polynomial algorithm on data and appending a checksum to the end of the packet At the receiving end a similar algorithm is performed and checked against the transmitted checksum Crossover cable Also known as rollover null modem or modem eliminator cable A cable which allows direct DTE to DTE connection without intermediate DCEs typically used to bridge the two communicating dev...

Страница 52: ...more accurately RS 232C or EIA TIA 232E Defined by the EIA a widely known standard electrical and physical interface for linking DCEs and DTEs for serial data communications Traditionally specifies a 25 pin D sub connector although many newer devices use a compact 9 pin connector with only the essential signaling lines used in asynchronous serial communications Lines have two possible states high ...

Страница 53: ...ressly approved by Encom Wireless Data Solutions Inc could void the user s authority to operate the equipment This device has been tested with MCX and Reverse Polarity TNC connectors with the antennas listed in Appendix A Maximum allowed TX power on the radio will be factory reduced if antenna gain higher than 6 dBi is ordered An ordered antenna will be shipped with the radio module if a buyer has...

Страница 54: ...50 ENC 900 Operating Manual Appendix E Approved Antennas ...

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