Method and system for verification of the baud rate for an asynchronous serial device residing within a data processing system

• US 5,612,961 A
• Filed: 04/27/1995
• Issued: 03/18/1997
• Est. Priority Date: 04/27/1995
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Foster, Richard A., Cabezas, Rafael G.
• Primary Examiner(s): Beausoliel, Jr., Robert W.
• Assistant Examiner(s): CHUNG, PHUNG M
• Application Number:
  US08/430,080
• Time in Patent Office: 691 Days
• Field of Search: 371/20.4, 371/20.5, 371/20.1, 324/160, 324/161, 324/76.11, 370/13, 370/15, 370/84, 370/91, 375/219-222, 375/224-225, 375/377, 375/368
• US Class Current: 714/715
• CPC Class Codes: H04L 5/1446 of transmission speed

Abstract

A method of verifying the baud rate for communication of data by an Asynchronous serial device residing within a data processing system. The data processing system having a first Asynchronous serial device and a second Asynchronous serial device. The first and second serial devices are connected one to another for communication of data therebetween. The first and second serial devices are initialized with a common baud rate for transmission and reception of data, respectively. A test sequence pattern is created, and transmitted at the common baud rate from the first serial device to the second serial device. The second serial device transmits the received test sequence pattern back to the first serial device. The test sequence pattern is then verified as either valid or invalid.

Claims

1. In a computer having a first and second Asynchronous serial device, the first and second serial devices being independent of one another, a method of verifying a selected baud rate for communication of data by said first serial device, said method comprising the steps of:

connecting said first serial device to said second serial device for communication of data therebetween;

transmitting a test sequence pattern at a selected baud rate from said first serial device to said second serial device;

re-transmitting said received test sequence pattern from said second serial device to said first serial device at the same selected baud rate; and

verifying that said test sequence pattern received by said first serial device is valid.

2. The method of claim 1 wherein said step of transmitting a test sequence pattern at a selected baud rate from said first serial device to said second serial device includes the steps of:

initializing said first device to transmit said test sequence pattern at said selected baud rate; and

transmitting said test sequence pattern at said selected baud rate from said first serial device to said second serial device.

3. The method of claim 2 further comprising the step of:

initializing said second serial device to receive said test sequence pattern at said selected baud rate.

4. The method of claim 3 wherein said test sequence pattern includes a first test pattern and a second test pattern.

5. The method of claim 4 wherein said first test pattern is a byte in length and said second test pattern is a byte in length.

6. The method of claim 1 further comprising the step of:

creating said test sequence pattern.