Related Manuals for Microhard Systems MRX-900
Summary of Contents for Microhard Systems MRX-900
- Page 1 MRX-900 900 MHz Spread-Spectrum Wireless Modem Operating Manual icrohard ystems Leaders in Wireless Telecom MRX-900 Operating Manual: Contents...
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Page 2: Wireless Modem
This manual contains information of proprietary interest to MRX-900 Microhard Systems Inc. It has been supplied in confidence to purchasers and users of the MRX-900, and by accepting this 900 MHz material the recipient agrees that the contents will not be copied... -
Page 3: Table Of Contents
3.9 Packet Parameters ............................. 12 3.10 Radio Statistics............................13 3.11 Slave List ..............................13 Appendices A. MRX-900 Configuration Menu Navigation Chart ..............15 B. Configuration Record ......................17 C. RS-232 Interface and Cables C.0 RS-232 Line Signals ..........................19 C.1 DTE-to-DCE (Straight-Through) Cables ....................19 C.2 Crossover / Null Modem Cables ....................... - Page 4 MRX-900 Operating Manual...
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Page 5: Introduction
While the MRX-900 is handsomely sleek and compact in its design, it delivers power and convenience and offers quality and dependability. The MRX-900’s versatility makes it the ideal solution for applications ranging from office-productivity to industrial data control and acquisition. -
Page 6: About This Manual
CRC-16 error detection and auto re-transmit to provide 100% accuracy and reliability of data; n ease of installation and use – the MRX-900 can be used as a drop-in replacement for most null-modem cable (DTE-to-DTE) operations, and as a modem replacement with minimal or no software changes. -
Page 7: Unpacking And Inspection
2.1 Additional Requirements Since the MRX-900 is a unique product in a class of its own, it will communicate only with another MRX-900 which has been compatibly configured. Thus, at least two MRX-900s will be required to establish a wireless communications link. -
Page 8: Connectors And Indicators
RS-232 Data Port (DCE) - The socketed (female) D-sub connector is used to interface the MRX-900 to a DTE device and operates at 2400 to 115,200 bps. The same port is used to configure the modem by interfacing to a terminal (at 9600 bps). -
Page 9: Configuration
Start by locating the Configuration Button at the rear of your MRX-900 and pressing it for two to three seconds. A menu similar to the following should appear on your... -
Page 10: Point-To-Multipoint
Attach the provided antenna Warning: Using an antenna other to the antenna connector on each MRX-900 and screw the antenna in snugly. than one approved by Microhard The modems should indicate the status of the wireless link via the RSSI Systems Inc. -
Page 11: Configuration Options
3. Configuration Options 3.0 Configuration Parameters The MRX-900 is easily configured to meet a wide range of needs and applications. Configuration is fully menu-driven and requires only a terminal with a 9600 baud RS-232 port. Configuration mode is initiated by depressing the Configuration Button on the back panel of the MRX-900 and holding it for at least two or three seconds. - Page 12 When this mode is selected, an additional option, “B) Slave List”, will appear in the main menu. Setting up the Slave List will be described in more detail later. MRX-900 Operating Manual: Configuration Options...
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Page 13: Serial Baud Rate
If the DTE is a personal computer, the port can usually be used reliably at 115200. It is important that the rate specified in the MRX-900 configuration matches that of the DTE to which it is connected, or the DTE-DCE communication will fail. -
Page 14: Network Address
Slave in the network. 3.6 Hopping Pattern Ensure that all units within a Since the MRX-900 is a frequency-hopping modem, the carrier frequency network use the same changes periodically according one of twenty pseudo-random patterns, hopping pattern, and that selected by defining the Hopping Pattern. -
Page 15: Encryption Key
3.8 Output Power Level The Output Power Level determines at what power the MRX-900 transmits. The super-sensitive MRX-900 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 polution”. To set the power level,... -
Page 16: Packet Parameters
“tied up” trying to retransmit, thus holding up pending data. (XXX) 4) CRC/Retransmit This parameter is either Enabled or Disabled, and determines whether the MRX-900 will handle error-checking and manage retransmissions (to guarantee accuracy of data, possibly at the cost of throughput), or whether these functions will be handled by the software on each DTE. -
Page 17: Radio Statistics
“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 values do not match, an error event is added to the total error count since power-up. - Page 18 Slave in the list. When selected, you are prompted with the following: “Clear the entire slave list? (Y) _”. Pressing “Y” will clear the entire list, while pressing any other key will exit and abort the command. MRX-900 Operating Manual: Configuration Options...
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Page 19: Mrx-900 Configuration Menu Navigation Chart
A. The Configuration Menus The following chart provides an “at-a-glance” overview of the menus available when configuring the MRX-900, as well as the valid parameters for each item. MRX-900 Operating Manual: The Configuration Menus... - Page 20 MRX-900 Operating Manual...
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Page 21: Configuration Record
19200 o 14400 o Normal _________ o 1000 mW (1W) o 9600 o 7200 o 4800 o 3600 o 2400 o 1 mW Repeater o 10 mW S/N: o 100 mW _________ o 1000 mW (1W) MRX-900 Operating Manual: Configuration Record... - Page 22 1 mW Slave List: Repeater o 10 mW S/N: o 100 mW _________ o 1000 mW (1W) o 1 mW Slave List: Repeater o 10 mW S/N: o 100 mW _________ o 1000 mW (1W) MRX-900 Operating Manual: Configuration Record...
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Page 23: Rs-232 Interface And Cables
25-pin C.1 DTE-to-DCE (Straight-Through) Cables 1 DCD → 8 Due to the variety of cabling requirements by each user of the MRX-900, 2 RX → 3 interface cables required for DTE-to-DCE connection are user-supplied 3 ← TX 2 items. -
Page 24: Crossover / Null Modem Cables
(n/c) 9 whereby an MRX-900, connected to a DTE, communicates with another MRX-900, whose serial port has been fitted with a DCE loopback plug. By “Crossover” / “Null” so doing, all data sent by the DTE should be wirelessly transmitted to the... -
Page 25: Surface Or Wall Mounting
The drill template and dimensional figure below has been provided to facilitate placement in case you wish to mount your MRX-900. Make a copy of the template at 100% scale and drill through the paper at each of the cross-hairs. Screw heads should be no larger than 5/16”... - Page 26 MRX-900 Operating Manual...
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Page 27: Troubleshooting
Here are solutions to some of the common problems and symptoms that may be experienced. ———————————— Problem: I am trying to set up the MRX-900 but I cannot get the configuration menu to appear. Solutions: 1. Make sure you are depressing the Configuration Button for at least 2 or 3 seconds. - Page 28 2. If you are using an MRX-900 as a Repeater, it will cut the effective throughput roughly in half because of its “store and forward” nature; the repeater spends half of its time receiving data and the other half transmitting the received data.
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Page 29: Technical Specifications
4.72” x 5.25” x 1.72” (119.9 mm x 133.4 mm x 43.7 mm) Weight 450 grams (with included antenna) Operating Environment Temperature: -30 to +60°C Humidity: 5 to 95%, non-condensing Storage Temperature -40 to 90°C 1. Clear line-of-sight, elevated high-gain antennas. MRX-900 Operating Manual: Troubleshooting... - Page 30 MRX-900 Operating Manual...
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Page 31: Glossary
G. Glossary Terminology Used in the MRX-900 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 Crossover cable of data are sent separately and at an arbitrary time (Also known as rollover, null- (not periodically or referenced to a clock). - Page 32 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 communications. Traditionally MRX-900 Operating Manual: Glossary...
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