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Table of Contents
Summary of Contents for Nomadic NMX920
- Page 1 NOMADIC COMMUNICATIONS NMX920 OEM Integrators Guide Version 1.02 December 1999...
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Page 2: Record Of Issue
The information in this specification is deemed reliable at the time of printing. Nomadic Communications does not assume responsibility for any errors that may appear in this specification nor any omissions that may have occurred at the time of printing. Interested parties must therefore rely on their own enquires. Nomadic Communications does not assume liability arising from the application or use of any information contained in this document or the product referred to by this document. -
Page 3: Table Of Contents
NMX920 OEM Integrators Guide 2. Contents Record of Issue......................2 Contents ........................3 Scope ........................4 3.1. Standards ......................4 3.2. Applicability....................... 4 Interface Notes......................5 Physical Requirements .................... 6 5.1. Dimensions ....................... 6 5.2. System Interface ....................6 5.3. -
Page 4: Scope
NMX920. It does not address the issues of good wireless application design, or code generation, though references to these issues can be found in section ……... -
Page 5: Interface Notes
When operated for the first time, via the correct assertion of the DTR pin (see section 6 below), the NMX920 may take several minutes as it attempts to become BORN on its’ registered MOBITEX Network. Once BORN, the NMX920 will enter its default mode, Battery Save or Express, as programmed at time of manufacture. -
Page 6: Physical Requirements
Refer to the Ordering Information. The NMX920 is available with either a RS-232 serial interface, or a TTL (5V) serial interface. This is an order time option, and is not retrofitable in the field. Refer to... -
Page 7: Rf Port
All No Connects must be left Open Circuit 5.3. RF Port The NMX920 is designed to operate with a 50 ohm antenna system. It is fitted with a MMCX miniature RF connector. As an order time option, the RF connector may... - Page 8 NMX920 OEM Integrators Guide during transmission. This current must be available instantly; the modem has less than 15 msec to change from receive mode to transmit mode, and at this point the power amplifier has finished its startup sequence. Additionally, the power supply must be able to provide this current without voltage sag for a maximum length transmission, about 980 msec.
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Page 9: Board To Board Connection
NMX920 OEM Integrators Guide 5.5. Board to Board Connection The NMX920 is available in a direct board to board configuration. In this configuration, the NMX920 mates directly with system interface and RF connectors in on the OEM system. This configuration eliminates all modem cabling, resulting in significant cost savings, and ease of assembly. -
Page 10: Modes Of Operation
SAVE MODE request" The NMX920 operates in one of three distinct power modes while power is applied to the External Interface; POWER-OFF MODE, BATTERY SAVE MODE and EXPRESS MODE. To provide control over the operational state, and power consumption of the NMX920, the OEM can change between these modes by issuing certain MASC commands and/or electrically activating the DTR line on the External Interface. -
Page 11: Application Of Power
6.1. Application of power Electrical power must be applied to the NMX920 via the PWR pins of the External Interface. The NMX920 will power-up, run internal diagnostics and then enter POWER-OFF MODE. The designer should allow at least 2 seconds between the application of power and the first attempt to communicate with the NMX920 to change out of POWER-OFF MODE. -
Page 12: Shutdown
1. Shut down NMX920 via the MASC FO command. 2. Wait for MASC FO response from the NMX920 to indicate that it has shut down. 3. Remove electrical power from the interface Following this procedure will ensure that the network is properly notified and no buffered messages are lost. -
Page 13: Notes For Integrators
7.1. Antenna The NMX920 requires a 50 Ω matched antenna with a VSWR no greater than 1.5:1 over the transmission band. The provision of the antenna system is the responsibility of the system integrator. -
Page 14: Power Supply
If the NMX920 is to be used in a body worn application, or if a 20 cm separation between antenna and body cannot be guaranteed by obstruction, then the entire integrated system must be re-evaluated for SAR. -
Page 15: Operational Notes
− The NMX920 fully complies with the BellSouth Wireless Data requirements for network delivered Lethal Injection. If the NMX920 is operating on the BellSouth network, receipt of a Lethal Injection will render the modem inoperable, requiring reactivation at a service centre or factory. Changing networks (F R or F 03) does not reset this condition −... -
Page 16: Mobitex Compliance
NMX920 OEM Integrators Guide 8. Mobitex Compliance The NMX920 is in conformance with the Mobitex Interface Specification (MIS) R4A. When operated on the BellSouth Mobitex network it also meets the BellSouth Mobitex extensions for Wireless Subscription Management (WSM). The NMX920 has been validated against the BellSouth test specification ‘Radio Modem Certification Test... - Page 17 NMX920 OEM Integrators Guide Power control for separate Not supported Not supported radio module Change MASC Full Full communication parameters RLSD control signal Not supported Not supported Battery saving mode control Full Full Product information Full Full F 01 Network contact status...
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Page 18: Technical Specification
NMX920 OEM Integrators Guide 9. Technical Specification Radio Transceiver Specification General Dual conversion receiver, directly modulated transmitter utilising common antenna and solid state transmit/receive RF switch. Modulation Technique NRZ GMSK (BT=0.3) Transmitter Frequency Range 895 – 905 MHz (800 channels) Receive Frequency Range 931 –... -
Page 19: Development Tools
NMX920 Mobitex® Radio Packet Modems. The NMD920 provides an optimised power supply for the NMX920 series modems, socket for antenna mounting and PC serial interface. Key Features Power control and regulation for the modem Modem plugs directly onto NMD920. -
Page 20: Ordering Information
NMX920 OEM Integrators Guide Ordering Information NMX F / HH / S / C / O Options Blank = None Configuration Blank = None Software Revision Blank = Latest Home Network 01 = United Wireless (400) 02 = STMD (400) -
Page 21: References
Federal Communications Commission (FCC) 47cfr, parts 2, 15, 90 − Industry Canada (IC) RSS-119 Issue 5, August 1996 Certification Report on Specific Absorption Rate (SAR) Experimental Analysis Nomadic Communications NMX 920 OEM Radio – Modem Date: 30 November, 1999. Aprel Laboratories Page 21 of 21...