Multimedia interface device and method

• US 5,167,021 A
• Filed: 09/19/1988
• Issued: 11/24/1992
• Est. Priority Date: 09/19/1988
• Status: Expired due to Fees

• Current Assignee: NCR Corporation (NCR Voyix Corporation)
• Original Assignee: NCR Corporation (NCR Voyix Corporation)
• Inventors: Needham, David B.
• Primary Examiner(s): Dixon, Joseph L.
• Application Number:
  US07/246,249
• Time in Patent Office: 1,527 Days
• Field of Search: 364/200 MS File, 364/900 MS File
• US Class Current: 710/16
• CPC Class Codes: G06F 3/002 Specific input/output arrangements not covered by G06F3/01 - G06F3/16 other optical apparatus G02B27/00
• CPC Class Codes: G06K 17/0022 arrangements or provisions for transferring data to distant stations, e.g. from a sensing device "transfer between computer elements G06F13/00 "; data-transmission H04L

Abstract

An interface device between, and a method for providing data from, one of a plurality of optical or magnetic media reader devices to a host is disclosed. The interface device comprises first and second input ports, each port being connectable to a selected media device. The device also comprises means for automatically identifying the type of media device connected to each of the ports by sequentially sampling control or data signals therefrom. It also includes means for determining when an identified media device is active by sampling control or data signals from each port that has an identified media device connected thereto.

Claims

1. A method for providing data from one of a pluality of media reader devices, said plurality of media reader devices including a bar code wand, bar code slot reader, laser scanner, CCD scanner and magnetic slot reader, to a host comprising the steps of:

providing an interface device between said media devices and said host;

providing first and second input ports to said interface device, each input port having three input lines for receiving one data and two control signals, respectively, from a connected media device, wherein said laser scanner and CCD scanner are connectable only to said first port, said control signals for said first port include signals for timing and a trigger, said magnetic slot reader is connectable only to said second port, and said control signals for said second port include signals for clock and badge-in-slot;

providing a line for an enable signal from said interface device to a media device connected to said first port, said enable signal being effective for activating either said laser scanner or CCD scanner;

selecting one or two of said media devices and connecting it or them to one or respective ones of said input ports;

identifying the type of media device connected to said first port by;

sampling said timing signal to determine if the media device is a CCD scanner;

transmitting said enable signal and sampling said timing signal to determine if the media device is a laser scanner; and

sampling said trigger signal or said data signal to determine if the media device is a bar code wand or bar code slot reader;

identifying the type of media device connected to said second port by;

sampling said clock or badge-in-slot signal to determine is the media device is a magnetic slot reader; and

sampling said data signal to determine if the media device is a bar code wand or bar code slot reader;

determining when an identified media device is active by sampling control or data signals from each port that has an identified media device connected thereto;

transferring data signals from said active media device into said interface device for processing; and

transferring said processed signals to said host.

2. The method of claim 1 wherein if a laser scanner has been identified as being connected to said first port, said step of determining when said laser scanner is active includes:

monitoring said trigger signal;

transmitting said enable signal from said interface device to said laser scanner when said trigger signal is active;

monitoring said timing signal for a predetermined signal; and

monitoring said data signal for a predetermined signal indicative of an active laser scanner.

3. The method of claim 1 wherein if a CCD scanner has been identified as being connected to said first port, said step of determining when said CCD scanner is active includes:

transmitting said enable signal from said interface device to said CCD scanner;

monitoring said timing signal for a predetermined signal; and

monitoring said data signal for a predetermined signal indicative of an active laser scanner.

4. The method of claim 1 wherein if a bar code wand or bar code slot reader has been identified as being connected to said first port, said step of determining when said bar code wand or bar code slot reader is active includes:

monitoring said data signal for a predetermined signal indicative of an active bar code wand or bar code slot reader.

5. The method of claim 1 wherein if a magnetic slot reader has been identified as being connected to said second port, said step of determining when said magnetic slot reader is active includes:

monitoring said badge-in-slot signal for a predetermined signal; and

monitoring said data signal for a predetermined signal indicative of an active magnetic slot reader.

6. The method of claim 1 wherein if a bar code wand or bar code slot reader has been identified as being connected to said second port, said step of determining when said bar code wand or bar code slot reader is active includes:

monitoring said data signal for a predetermined signal indicative of an active bar code wand or bar code slot reader.