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- Page 1 Operating Manual MHX-2400 2.4 GHz Spread Spectrum OEM Transceiver Revision 1.11, December 1, 2000 Microhard Systems Inc. #110, 1144 - 29 Ave. N.E. Calgary, Alberta T2E 7P1 Phone: (403) 248-0028 Fax: (403) 248-2762 www.microhardcorp.com...
- Page 2 This manual contains information of proprietary interest to Microhard Systems Inc. It has been supplied in confidence to purchasers and users of the MHX-2400, and by accepting this 2.4 GHz material the recipient agrees that the contents will not be copied...
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Page 3: Table Of Contents
Contents Introduction Product Overview ....................................1 Features......................................1 About this Manual ..................................... 2 Initial Setup and Configuration Unpacking and Inspection ................................. 3 Additional Requirements ................................... 3 Connectors and Indicators.................................. 3 Configuration..................................... 6 Checking the Link....................................6 Configuration Options Command Line Interface..................................9 AT Commands.................................... -
Page 5: Introduction
While the MHX-2400 module is compact in its design, it delivers power and convenience and offers quality and dependability. The MHX-2400 module’s versatility makes it the ideal solution for applications ranging from office- productivity to industrial data control and acquisition. -
Page 6: About This Manual
AT style commands, very similar to those used by traditional telephone line modems. While the typical application for the MHX-2400 is to provide a short- to mid- range wireless communications link between DTEs, it can be adapted to almost any situation where an asynchronous serial interface is used and data intercommunication is required. -
Page 7: Initial Setup And Configuration
MHX-2400 Wireless Modem module Operating Manual (this document) 2.1 Additional Requirements Since the MHX-2400 module is a unique product in a class of its own, it will communicate only with another MHX-2400 module which has been compatibly configured. Thus, at least two MHX-2400 modules will be required to establish a wireless communications link. - Page 8 800 mA connect both the radio and Vcc Logic - These pins supply power for the MHX-2400’s digital circuitry. It is logic Vcc connections recommended you use a linear regulator to feed Vcc Logic. Current together.
- Page 9 Data Port (DCE) - Pins 21 through 28 inclusive. This port is used to interface the MHX-2400 module to a DTE device and operates at 2400 to 115,200 bps. The levels are active low 5V logic levels, and include (See Appendix B for a complete description): Pin No.
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Page 10: Configuration
2.3 Configuration Prior to establishing a wireless link, each MHX-2400 module participating in the link must be correctly configured for compatibility and for the desired Network 1 mode of operation. Network topologies consisting of a single Master and virtually any combination of Slaves and Repeaters may be deployed. -
Page 11: Checking The Link
Master modem. As data is sent from Slave to Master, the RX indicator should blink on as correct packets of data are received. It is recommended that if MHX-2400 modules will be deployed in a 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... -
Page 12: Configuration Options
3. Configuration Options 3.0 Command Line Interface The MHX-2400 modem can be easily configured to meet a wide range of needs and applications. You can have your modem perform a variety of functions by sending it instructions (in the form of commands). Sending a command overrides the modem’s operating characteristics. -
Page 13: At Commands
“autobaud” while in Data Mode. 3.1 AT Commands Several AT Commands are supported by the MHX-2400 module. The following is a short description of all available commands. ‘*’ denotes standard factory settings. All of the following commands must be preceded by “AT”... -
Page 14: O On-Line Mode
*&D0 DTR line is ignored &D1 Not Supported &D2 DTR disconnects and switches to Command Mode &D3 DTR disconnects and resets modem. Modem will remain in this state until DTR again goes active. MHX-2400 Operating Manual: Chapter 3 Configuration Options... -
Page 15: F Load Factory Default Configuration
This command causes the modem to display the current setting of S register xxx. Sxxx=yyy Set S register value (see section 3.3 S-Registers) This command sets the specified S register to a value specified by yyy. MHX-2400 Operating Manual: Chapter 3 Configuration Options... -
Page 16: Command Result Codes
3.2 Command Result Codes The MHX-2400 module can either display the results of a command as either text strings or numerical data. The following chart shows resulting text string and corresponding numeric result. NO CARRIER ERROR CONNECT 2400 CONNECT 3600... -
Page 17: S Registers
This register cannot be stored to non-volatile memory. If the modem is reset, or powered down, the default value is restored. Default is ‘BS’ (decimal 8). MHX-2400 Operating Manual: Chapter 3 Configuration Options... -
Page 18: S Register 101 - Operating Mode
S Register 101 - Operating Mode The Operating Mode (register S101) partly defines the “personality” of the MHX-2400 module. Allowable settings for this register are 1 through 4 as follows:. • S101=1 Master Point to Multipoint • S101=2 Master Point to Point •... - Page 19 Pattern 1 Hop Pattern 2 Figure 4 - A Network Utilizing Three Hopping Patterns If there is no DTE connected to the Repeater, turn off handshaking (&K0) and set the baud rate to 115K. MHX-2400 Operating Manual: Chapter 3 Configuration Options...
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Page 20: S Register 102 - Serial Baud Rate
In general, Forward Error Correction (FEC) reduces throughput, but in some environments will actually increase throughput. FEC can reduce the number of bad data packets, and hence reduce the need to retransmit. MHX-2400 Operating Manual: Chapter 3 Configuration Options... -
Page 21: S Register 104 - Network Address
S Register 106 - Primary Hopping Pattern S Register 206 - Secondary Hopping Pattern Since the MHX-2400 is a frequency-hopping modem, the carrier frequency changes periodically according to one of 49 pseudo-random patterns, defined by the Primary and Secondary Hopping Patterns. Valid entries for each are 0 through 50. - Page 22 However, if the units are far enough away from one another, hopping patterns may be reused in different sections of the network, without causing interference. MHX-2400 Operating Manual: Chapter 3 Configuration Options...
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Page 23: S Register 107 - Encryption Key
S Register 108 - Output Power Level The Output Power Level determines at what power the MHX-2400 transmits. The super-sensitive MHX-2400 can operate with very low power levels, so it is recommended that the lowest power necessary is used; using excessive power contributes to unnecessary “RF pollution”. -
Page 24: S Register 109 - Hopping Interval
7 bits, No Parity, 2 Stop 7 bits, Even Parity, 1 Stop 7 bits, Odd Parity, 1 Stop 7 bits, Even Parity, 2 Stop 7 bits, Odd Parity, 2 Stop 9 bits, No Parity, 1 Stop MHX-2400 Operating Manual: Chapter 3 Configuration Options... -
Page 25: S Register 116 - Packet Character Timeout
After which, if the timer detects a gap in the data exceeding the Packet Character Timeout value, the modem will transmit the data. The MHX-2400 will accumulate data in its buffers from the DTE until one of the following requirements is met (whichever occurs first): •... - Page 26 Valid settings are 0 to 255 retries. The default value is 2. The Repeater makes use of this parameter when it is tuned to its Primary Hopping Pattern and is acting like a Slave. MHX-2400 Operating Manual: Chapter 3 Configuration Options...
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Page 27: S Register 115 - Packet Repeat Interval
Slaves in the system. S Register 117 - Modbus Mode Modbus Mode allows for the MHX-2400 to be fully Modbus compatible. Please contact Microhard Systems for assistance when configuring the unit for Modbus operation. Optimal Modbus settings rely on several other S Register parameters. -
Page 28: S Register 123 - Rssi Reading
S Register 120 - RTS/DCD Framing S Register 121 - DCD Timeout The MHX-2400 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. - Page 29 MHX-2400 Operating Manual: Chapter 3 Configuration Options...
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Page 30: Modem Command Summary
A. Modem Command Summary The following provides a command summary for the MHX-2400 module. Factory settings are denoted with a ‘*’. AT Commands S Registers Answer Auto Answer [0...255] Command Echo 0 = power up in Command Mode, E0 No Echo... - Page 31 MHX-2400 Operating Manual: RS-232 Interface and Cables...
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Page 33: Serial Interface
B. Serial Interface The MHX-2400 module uses 8 pins on the header connector for asynchronous serial I/O. The interface conforms to standard RS-232 signals without level shifting, so direct connection to a host microprocessor is possible. The signals in the asynchronous serial interface are described below:... - Page 34 MHX-2400 Operating Manual: Appendix B Serial Interface...
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Page 35: Sample Schematic Diagram
DO NOT CONNECT THE MHX-2400 TO RS 232 DRIVER OUTPUTS. DAMAGE TO THE UNIT MAY RESULT. On this implementation, the onboard SCI of the PIC 16C74 is directly connected pins 2 and 3 of the MHX-2400. The bi- directional Port D is used for asserting or monitoring control signals from the MHX-2400. - Page 36 MHX-2400 Operating Manual: Appendix C Sample Schematic Diagram...
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Page 37: Factory Default Settings
RTS/DCD Framing (ms) S120=0 DCD Timeout (ms) S121=0 DCD Timeout (ms) S121=0 Secondary Hop Pattern S206=2 (Don’t Care) Secondary Hop Pattern S206=2 (Don’t Care) Packet Retry Limit S213=2 Packet Retry Limit S213=2 MHX-2400 Operating Manual: Appendix D. Factory Default Settings... - Page 38 MHX-2400 Operating Manual: Appendix D Factory Default Settings...
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Page 39: Performance Tables
Slave to Master 2 (12 ms) Through One or 3 (16 ms) More Repeaters. 4 (20 ms) 5 (30 ms) Link Rate = Fast 6 (45 ms) WITH FEC 7 (80 ms) 8 (120 ms) MHX-2400 Operating Manual: Appendix E. Performance Tables... - Page 40 MHX-2400 Operating Manual: Appendix E. Performance Tables...
- Page 41 Patterns 44 to 48 may be manually edited by entering AT&H at the Command Line. Each pattern must use a channel only once, and must consist of exactly 76 channels. There are 202 channels available ranging from Channel 1 at 2.4016 GHz up to Channel 202 at 2.4820 GHz MHX-2400 Operating Manual: Appendix F. Hopping Patterns...
- Page 42 MHX-2400 Operating Manual: Appendix F. Hopping Patterns...
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Page 43: Technical Specifications
Encl: 3.5” x 2.1” x 1.” (90 mm x 53 mm x 25 mm) Dimensions (LxWxH) Weight 75 grams Operating Environment Temperature: -40 to +70°C Humidity: 5 to 95%, non-condensing Storage Temperature -40 to 90°C 1. Clear line-of-sight, elevated high-gain antennas. MHX-2400 Operating Manual: Appendix G. Technical Specifications... - Page 44 MHX-2400 Operating Manual: Appendix G. Technical Specifications...
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Page 45: Glossary
H. Glossary Terminology Used in the MHX-2400 Operating Manual Asynchronous communications receiving end, a similar algorithm is performed A method of and checked against the transmitted checksum. telecommunications in which units of single bytes of data are sent separately and at an arbitrary time... - Page 46 (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 communications. Traditionally specifies a 25-pin D-sub connector, although MHX-2400 Operating Manual: Appendix H . Glossary...
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