Microhard Systems MHX-900 Operating Manual Download | Manualshive

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Operating Manual

900 MHz Wireless

Spread-Spectrum OEM Modem

Revision 03 - May 12, 1999

Microhard Systems Inc. has made every effort to assure that this document is accurate and complete. However, the
company reserves the right to make changes or enhancements to the manual and/or the product described herein at
any time and without notice. Furthermore, Microhard Systems Inc. assumes no liability resulting from any omissions
in this document, or out of the application or use of the device described herein.

Microhard Systems Inc.

Leaders in Wireless Telecom

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Summary of Contents for MHX-900

Page 1: ...mplete However the company reserves the right to make changes or enhancements to the manual and or the product described herein at any time and without notice Furthermore Microhard Systems Inc assumes...

Page 2: ......

Page 3: ...ration 10 W Write Configuration to memory 10 Sxxx Read S register value 10 Sxxx yyy Set S register value 10 3 2 Command Result Codes 10 3 3 S Registers 11 S Register 2 Escape Code 11 S Register 3 CR C...

Page 4: ......

Page 5: ...ndability The MHX 900 module s versatility makes it the ideal solution for applications ranging from office productivity to industrial data control and acquisition While a pair of MHX 900 modules can...

Page 6: ...ins instructions suggestions and information which will help you set up and achieve optimal performance from your equipment using the MHX 900 module It is assumed that users of the MHX 900 module have...

Page 7: ...n new or existing designs n Relatively small footprint for the MHX 900 module e g 2 1 W x 3 5 L x 0 8 H on the OEM PCB n Serial port and control signals from the host microprocessor See sample applica...

Page 8: ...MHX 900 module s digital electronics To simplify the OEM design the Radio VCC can be connected to the Logic VCC Maximum current while transmitting is approx 100 mA DC GND These are the Ground supply...

Page 9: ...minimum configuration requirements for point to point and point to multipoint are summarized below These requirements will get you started and only ensure that a link can be established but do not ne...

Page 10: ...iguration into non volatile memory and are therefore retained even after powering down Each item and the settable parameters within the modem configuration are described in detail in Chapter 3 Configu...

Page 11: ...er command 3 Issuing the online command You can place the modem into Command Mode either by 1 Sending the escape sequence 2 Toggling the DTR line Note When the connection is lost to the remote modem t...

Page 12: ...able commands denotes standard factory settings A Answer The A command causes the modem to attempt to connect with another remote modem D Dial Using the D command the modem will set itself for master...

Page 13: ...d load stored configuration The Z command resets the modem and loads the stored configuration C DCD Data Carrier Detect The C command controls the modems DCD output signal to the host microprocessor T...

Page 14: ...e modem s non volatile memory Sxxx Read S register value This command causes the modem to display the current setting of S register xxx Sxxx yyy Set S register value see section on S Registers This co...

Page 15: ...43 S Register 3 CR Control Code This register contains the ASCII value of the carriage return character This is the character that is used to end the command line and is also the character that appear...

Page 16: ...edgements along with CRC error checking ensure that data is passed through exactly once and that the data is not corrupted 3 Master Point to Multipoint In a point to multipoint network one unit should...

Page 17: ...reliably at 115200 S Register 103 Wireless Link Rate The Wireless Link Rate is the speed and optimization method for which modems will communicate over the RF link The allowable settings are 1 Turbo...

Page 18: ...rently in close proximity it is suggested that an atypical value be chosen perhaps something meaningful yet not easily selected by chance or coincidence Default is 0 S Register 105 Unit Address In poi...

Page 19: ...f high gain directional antennas are placed high above ground level and are in direct line of sight 10 mW 200 500 ft indoors 8 15 km outdoors 100 mW 400 800 ft indoors 15 25 km outdoors 1000 mW 1 W Ty...

Page 20: ...he following settings are available S Register 111 Minimum Size This setting has a range of 0 to 255 and defines the number of bytes to accumulate from the DTE before transmitting a packet Setting thi...

Page 21: ...ximum Size 255 S113 Retransmissions 255 S114 Address Header Disabled S Register 111 Minimum Size The Minimum Size parameter prevents the Slave from sending data until it has buffered a minimum number...

Page 22: ...Maximum Packet Size includes the Address Header For example if the Maximum Packet Size is set to 128 and the Text Address Header option is selected then the Master will tell the Slave to send a maxim...

Page 23: ...mand mode V View Configuration W Write configuration to memory Sxx Read S register value Sxx yy Set S register value Result Codes 0 OK 1 CONNECT 2 RING 3 NO CARRIER 4 ERROR 8 NO ANSWER 10 CONNECT 2400...

Page 24: ...20 MHX 900 Operating Manual Appendix A Modem Command Summary...

Page 25: ...rted TTL low by the DTE to inform the modem that it is alive and ready for communications SG Signal Ground Provides a ground reference for all signals transmitted by both DTE and DCE DSR Data Set Read...

Page 26: ...22 MHX 900 Operating Manual Appendix B Serial Interface...

Page 27: ...Y RESULT On this implementation the onboard SCI of the PIC 16C74 is directly connected pins 22 and 23 of the MHX 900 The bi directional Port D is used for asserting or monitoring control signals from...

Page 28: ...24 MHX 900 Operating Manual Appendix C Sample Schematic Diagram...

Page 29: ...The same Hopping Interval S Register S109 value must be selected for both modems n The same Encryption Key S Register S107 value must be selected for both modems The master can now attempt to synchron...

Page 30: ...26 MHX 900 Operating Manual Appendix D Modem Setup Overview...

Page 31: ...stained in intelligent asymmetrical full duplex transmission mode Communications Range Up to 30 kilometres 19 miles line of sight Power Requirements 4 75 to 5 5 VDC Power Consumption 5500 mA at 1 W tr...

Page 32: ...28 MHX 900 Operating Manual Appendix E Technical Specifications...

Page 33: ...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 performed and chec...

Page 34: ...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 for serial data co...

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