Wireless modem

• US 6,151,355 A
• Filed: 10/06/1997
• Issued: 11/21/2000
• Est. Priority Date: 10/07/1996
• Status: Expired due to Term

• Current Assignee: Calamp Wireless Networks Inc. (CalAmp Corporation)
• Original Assignee: Dataradio, Inc. (CalAmp Corporation)
• Inventors: Vallee, Richard, Pearl, Norman D., Lambert, Claude F., Prest, Edward C., Morrow, Andrew D.
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Ha, Dac V.
• Application Number:
  US08/944,565
• Time in Patent Office: 1,142 Days
• Field of Search: 375/220, 375/222, 375/257, 379/93.28, 379/93.31
• US Class Current: 375/220
• CPC Class Codes: G06F 13/385 for adaptation of a particular data processing system to different peripheral devices
• CPC Class Codes: H04M 11/066 Telephone sets adapted for data transmision

Abstract

A modem unit, typically a wireless modem unit, has a bidirectional digital data port, a modem, a transceiver, and a microcontroller programmed to control the unit according to a control program. The modem unit has a command mode, and the microcontroller is programmed to recognize certain commends by means of a prefix as remote commands and retransmit them to a remote modem unit rather than acting on them locally. The microcontroller is also programmed to monitor operating parameters of the modem unit and optionally to insert data relating to these parameters into a prefix to data strings transmitted by the modem unit and strip such prefixes from data strings received by the modem unit. The microcontroller controls switches which determine the routing of data between the port, the modem and the microcontroller so that the above functions may be implemented.

Claims

1. A modem unit comprising a bidirectional serial digital data port, a transceiver, and a modem receiving digital data for transmission from said port and converting it to analog signals for modulating a transmitter of said transceiver, and receiving and demodulating analog signals from a receiver of said transceiver to received digital data provided to said port, said modem unit further comprising a microcontroller connected to provide to said modem data to be modulated and transmitted and to receive received and demodulated data from said modem, and switches connected between the port, the modem and the microcontroller and controlled by said microcontroller, the switches determining whether said modem receives data to be transmitted from the microcontroller and/or the port and whether the modem passes received data to the microcontroller and/or the port, and whether the microcontroller receives data from the modem and/or the port.

2. A modem unit according to claim 1, further including control and handshaking lines connected between the port and the microcontroller.

3. A modem unit according to claim 1, further including means monitoring operating parameters of the modem unit, and connected to the microcontroller, and control lines for the transceiver connected to the microcontroller.

4. A modem unit according to claim 1, wherein the transceiver is a radio transceiver.

5. A modem unit according to claim 1, wherein the microcontroller is programmed to respond to a signal on a control line from the port to the microcontroller to place the modem in a command mode by operating switches to connect the microcontroller to receive data strings representing commands from the port, and the microcontroller is programmed to recognize a prefix to certain commands identifying them as remote commands, and to respond thereto by operating switches such that the modem receives data to be transmitted from the microcontroller and retransmits such commands to the modem.

6. A modem unit comprising a bidirectional serial digital data part, a transceiver, and a modem receiving digital data for transmission from said port and converting it to analog signals for modulating a transmitter of said transceiver, and receiving and demodulating analog signals from a receiver of said transceiver to received digital data provided to said port, said modem unit further comprising a microcontroller connected to provide to said modem data to be modulated and transmitted and to receive received and demodulated data from said modem, and switches connected between the port, the modem and the microcontroller and controlled by said microcontroller, the switches determining whether said modem receives data to be transmitted from the microcontroller and/or the port and whether the modem passes received data to the microcontroller and/or the port, and whether the microcontroller receives data from the modem and/or the port;

the modem unit further including means connected to the microcontroller for monitoring operating parameters of the modem unit, and control lines for the transceiver connected to the microcontroller; and

the microcontroller being programmed to optionally prepend a header containing data from said monitoring means to data strings passing through the unit from the port to the modem, and to strip headers containing such data received from another modem from data strings passing through the unit from the modem to the port.

7. A modem unit comprising a serial dataport, a modem, a transceiver, and a microcontroller programmed to control the passage of data sequences to be transmitted from the port through the modem to the transceiver, and received data sequences from the transceiver through the modem to the port, wherein the microcontroller is connected to sense plural operating characteristics of the modem, wherein the microcontroller is programmed to have the capability of being set up to delay a data screen from the external port while it delivers to the modem a diagnostic header containing data as to said operation characteristics, and wherein the microcontroller is programmed if so set up both to delay admission to the port of a data sequence received from said transceiver and modem and diverts to itself a diagnostic header prepended to said received data sequence.

8. A modem unit according to claim 7 wherein the transceiver is a radio transceiver.

9. A modem unit comprising a serial data port, a modem, a transceiver, and a microcontroller having a control program programmed to provide an on-line mode controlling the passage of data sequences to be transmitted from the port through the modem to the transceiver, and received data sequences from the transceiver through the modem to the port, the microcontroller also being programmed to provide a command mode in which the program interprets data sequences received through the port and executes commands comprised by those sequences, the improvement wherein the microprocessor is programmed in command mode to recognize data sequences from the data port having a predetermined first prefix as a command to construct a data sequence incorporating a further command and the address of a remote modem unit comprised by the original data sequence, said further command itself having a further prefix identifying it as containing a command, and to send the constructed sequence through the modem to the transceiver, and wherein the microcontroller is programmed to recognize data sequences received from the transceiver and the modem and having such a further prefix as containing either a further command or a response to a command.

10. A modem unit according to claim 9, wherein the transceiver is a radio transceiver.

11. A modem unit according to claim 9, wherein the microcontroller is connected and programmed to sense plural operating characteristics of the modem, wherein the microcontroller is programmed to have the capability of being set up to delay a data strong from the external port while it delivers to the modem a diagnostic header containing data as to said operating characteristics, and wherein the microcontroller is also programmed if so set up to delay admissions to the port of a data sequence received from said transceiver and modem while it diverts to itself a diagnostic header prepended to said received data sequence.

12. A modem unit according to claim 11, further including switches connected between the port, the modem and the mcirocontroller, and controlled by said microcontroller, the switches determining whether said modem receives data to be transmitted from the microcontroller and/or the port and whether the modem passes received data to the microcontroller and/or the port, and whether the microcontroller receives data from the modem and/or the port.