CalAmp 09002 Manual De Usuario
Interface Specification Document
Rev. -
Cellular Radio Module
CRM4250/4200
Company Confidential
Standard Communications Corp.
-4-
November 20, 2000
1.0. SYSTEM OVERVIEW
The Standard Communications CRM4250/4200 Cellular Radio Module is part of a
two-piece solution for wireless data communications. The CRM4250/4200 unit is
used in conjunction with a separate modem unit to provide a complete solution. This
architecture allows use of multiple radio and other media interface modules with a
common multi-standard modem unit.
two-piece solution for wireless data communications. The CRM4250/4200 unit is
used in conjunction with a separate modem unit to provide a complete solution. This
architecture allows use of multiple radio and other media interface modules with a
common multi-standard modem unit.
2.0 GENERAL DESCRIPTION
The CRM4250/4200 contains all of the functional elements of a complete cellular
telephone with the exception of the user interface and the battery. The unit includes a
complete receiver and transmitter; plus, a micro controller and other circuitry to
allow the unit to efficiently interface to an external modem unit.
telephone with the exception of the user interface and the battery. The unit includes a
complete receiver and transmitter; plus, a micro controller and other circuitry to
allow the unit to efficiently interface to an external modem unit.
3.0. INTERFACE SPECIFICATION
3.1 General
The CRM4250/4200 interface is designed to allow simple interfacing between
various modems and radio modules. It is designed to be hardware and standard
independent on both the radio and the modem sides of the interface. This interface
has been submitted to the PCMCIA committee for adoption as an extension to the
PCMCIA modem card auxiliary connector standard.
various modems and radio modules. It is designed to be hardware and standard
independent on both the radio and the modem sides of the interface. This interface
has been submitted to the PCMCIA committee for adoption as an extension to the
PCMCIA modem card auxiliary connector standard.
The interface command set includes operating modes to support many different radio
system standards. At present, the standards defined for the interface include AMPS
cellular telephone. Products utilizing this interface may support one or more of these
operating modes and will have the ability to query the personality of a given module
and to set the operating mode of a multiple mode module.
system standards. At present, the standards defined for the interface include AMPS
cellular telephone. Products utilizing this interface may support one or more of these
operating modes and will have the ability to query the personality of a given module
and to set the operating mode of a multiple mode module.