Microhard Systems MRX-900 Operating Manual Download

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MRX-900 Operating Manual: Contents

MRX-900

900 MHz Spread-Spectrum

Wireless Modem

Operating Manual

icrohard

ystems

nc.

Leaders in Wireless Telecom

Summary of Contents for MRX-900

Page 1: ...MRX 900 Operating Manual Contents i MRX 900 900 MHz Spread Spectrum Wireless Modem Operating Manual Microhard Systems Inc Leaders in Wireless Telecom...

Page 2: ...ife 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 th...

Page 3: ...in Configuration Menu 7 3 1 Operating Mode 7 3 2 Serial Baud Rate 9 3 3 Wireless Link Rate 9 3 4 Network Address 10 3 5 Unit Address 10 3 6 Hopping Pattern 10 3 7 Encryption Key 11 3 8 Output Power Le...

Page 4: ...ii MRX 900 Operating Manual...

Page 5: ...ty The MRX 900 s versatility makes it the ideal solution for applications ranging from office productivity to industrial data control and acquisition While a pair of MRX 900 modems can link two termin...

Page 6: ...performance from your equipment using the MRX 900 Although the manual is intended for all MRX 900 users from the novice to the professional it is recommended that new users of the MRX 900 thoroughly r...

Page 7: ...n when preparing to install your MRX 900 wireless modem These represent typical requirements but due to the large variation of user needs and applications the items are user supplied and are not acces...

Page 8: ...minal keyboard Receive LED Lights up when the modem receives data over the wireless link as well as during internal carrier search and synchronization operations Transmit LED Lights to indicate that t...

Page 9: ...rear of your MRX 900 and pressing it for two to three seconds A menu similar to the following should appear on your terminal screen Microhard Systems Inc MRX 900 Configuration 1 Operating Mode Slave...

Page 10: ...odems n All modems must use the same Encryption Key Each of the parameters above are defined using the terminal to display the menu driven configuration screens and setting the appropriate items Setti...

Page 11: ...600 baud is the default rate for configuration only and that the actual data communications rate during operation is user defined with rates from 2400 to 115 200 bps With reference to the serial data...

Page 12: ...Master either directly or through a repeater whose network address unit address and hopping pattern matches its own 3 Master Point to Multipoint In a point to multipoint network one unit should be se...

Page 13: ...E communication will fail 3 3 Wireless Link Rate The Wireless Link Rate is the speed and optimization method for which modems will communicate over the RF link The possible settings are Wireless Link...

Page 14: ...urrently in close proximity it is suggested that an atypical value be chosen perhaps something meaningful yet not easily selected by chance or coincidence 3 5 Unit Address In point to point operation...

Page 15: ...iguration menu and select one of the following Power Output Level 1 1 mW 2 10 mW 3 100 mW 4 1000 mW 5 Adaptive ESC to exit Select Power Output Level _ Ideally you should test the communications perfor...

Page 16: ...essary for reliable communications If the wireless link is consistently good and solid a maximum size of 255 is recommended However if the link is poor e g experiencing excessive interference and data...

Page 17: ...ich point it wraps around to 0 again Number of errors detected by CRC Each packet transmitted by the MRX 900 includes a checksum against which the data on the receiving end is checked If the CRC value...

Page 18: ...iously entered slave from the Slave List When selected the prompt Delete Slave Address _ appears A value from 0 to 65535 should be entered followed by Enter Return 3 Show List This option displays the...

Page 19: ...te Wireless Link Rate Maximum Size Timeout Interval Power Output Level Slave List Radio Stats Packet Parameters Retry Timeout 1 115200 2 57600 3 38400 4 28800 5 19200 6 14400 7 9600 8 7200 9 4800 A 36...

Page 20: ...16 MRX 900 Operating Manual...

Page 21: ...Mode Unit Address Output Power Level Serial Baud Rate Wireless Link Network Address 0 65535 Hopping Pattern A T Encryption Key 0 65535 Master S N _________ o 1 mW o 10 mW o 100 mW o 1000 mW 1W o 11520...

Page 22: ...ve S N _________ Unique Unit Address 0 65535 o 1 mW o 10 mW o 100 mW o 1000 mW 1W o 115200 o 57600 o 38400 o 28800 o 19200 o 14400 o 9600 o 7200 o 4800 o 3600 o 2400 Slave S N _________ Unique Unit Ad...

Page 23: ...o Send A handshaking signal which is asserted by the DTE when it is ready to transmit data Typically the DCE responds by activating CTS Essentially RTS is the DTE s way of saying I am ready to send da...

Page 24: ...l as its connection to another DCE via DCD these are relayed together as a ready state indicator from the DTE via DTR Wiring diagrams for the most common cables of this type are provided for your refe...

Page 25: ...be no larger than 5 16 diameter with outer screw shaft of no more than about 1 8 If mounted with the rubber footprint on bottom of unit about 1 4 clearance should be left between surface and bottom of...

Page 26: ...22 MRX 900 Operating Manual...

Page 27: ...oint operation ensure that each Slave has a unique Unit Address and they are included in the Slave List of Repeaters if applicable and of the Master In point to point mode ensure the Unit Address on b...

Page 28: ...cy Check to see that this option is enabled recommended and see if the situation improves 2 If CRC 16 error detection is enabled and this problem is occurring it is likely due to the link between the...

Page 29: ...itivity 105 dBm Output Power 1mW 10mW 100mW 1W user selectable or adaptive Spreading Code Frequency Hopping Hopping Patterns 20 pseudo random user selectable Error Detection CRC 16 with auto re transm...

Page 30: ...26 MRX 900 Operating Manual...

Page 31: ...cy Check An error detection scheme for transmitted data Performed 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...

Page 32: ...or communications device RS 232 Recommended Standard 232 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...

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