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Patent US3787810A successfully refreshed from Google Patents.
US3787810A
Expired / Lapsed
US
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Test method for a programmable data communication terminal
Assignee: Unisys Corp
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Filing: 1972-11-02
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Granted: 1974-01-22
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Expires: 1992-11-02
Abstract
Abstract A method of testing the transmit and receive functions of a programmable data communications terminal. The transmit function is tested by having a program within the terminal computer continually transmit a known bit pattern and measuring the voltage output of the transmit line. The receive function is tested by connecting the request to send line to the receive data line and programmably generating a character on the request to send line that may be read via the receive data line.
Inventors
- 👤 G Wiggins
- 👤 J Rogers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 22:37
CPC Classifications
G; G06; G06F; G06F11/00; G06F11/22; G06F11/2205; G06F11/2221; G06F11/26; G06F11/273; G06F11/277; H; H04; H04L; H04L1/00; H04L1/24
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
138 words
A method of testing a programmable data communication terminal wherein said method comprises the steps of: generating on the data transmit line of said terminal a continuously repeating bit pattern, comparing the direct current voltage of said data transmit line carrying said bit pattern to the calculated average voltage for said bit pattern, applying a direct current voltage to the carrier detect line of said terminal so as to represent the detection of a carrier signal, connecting a request to send line of said terminal to a receive data line of said terminal, generating a bit pattern on said request to send line by programmatically setting and resetting said request to send line, and comparing said bit pattern generated on said request to send line with the bit pattern received in said terminal from said receive data line.
Claim 2
Independent Claim
138 words
A method of testing a programmable data communication terminal wherein said method comprises the steps of: generating on the data transmit line of said terminal a continuously repeating bit pattern, comparing the direct current voltage of said data transmit line carrying said bit pattern to the calculated average voltage for said bit pattern, applying a direct current voltage to the carrier detect line of said terminal so as to represent the detection of a carrier signal, connecting a request to send line of said terminal to a receive data line of said terminal, generating a bit pattern on said request to send line by programmatically setting and resetting said request to send line, and comparing said bit pattern generated on said request to send line with the bit pattern received in said terminal from said receive data line.
Claim 3
Independent Claim
95 words
A method of testing the receive function of data communication terminals wherein said terminals interface with data communication networks by means of request to send lines, receive data lines and carrier detect lines, wherein said method comprises the steps of: generating programmatically on said request to send line a signal representing a specified data character, simulating a carrier detect signal, connecting said request to send line with said receive data line, and comparing said character generated on said request to send line with the bit pattern received in said terminal over said receive data line.
Claim 4
Independent Claim
95 words
A method of testing the receive function of data communication terminals wherein said terminals interface with data communication networks by means of request to send lines, receive data lines and carrier detect lines, wherein said method comprises the steps of: generating programmatically on said request to send line a signal representing a specified data character, simulating a carrier detect signal, connecting said request to send line with said receive data line, and comparing said character generated on said request to send line with the bit pattern received in said terminal over said receive data line.
Claim 5
Dependent Claim
52 words
The method as defined in claim 2 wherein said signal generated on said request to send line is generated by programming said terminal computer to apply positive and negative voltages to said request to send line for time periods as determined by the bit rate said terminal computer is set to receive.
Claim 6
Dependent Claim
25 words
The method of claim 2 wherein said carrier detect signal is simulated by applying a constant direct current voltage source to said carrier detect line.
Claim 7
Independent Claim
143 words
A method of testing a digital computer with data communications facilities that interface with the data communications network by means of request to send lines, receive data lines, transmit data lines and carrier detect lines wherein said method comprises the steps of: programming said computer to generate on said data transmit line a continuously repeating bit pattern, measuring the average direct current voltage of said data transmit lines by means of a direct currEnt voltage measuring apparatus, comparing said measurement of said direct current voltage rating apparatus to the average value for said generated bit pattern, placing said computer in a receive mode, applying a carrier detect signal to said carrier detect line, generating programmatically on said request to send line a data character, and comparing said data character generated with the bit pattern received in said terminal over said receive data line.
Claim 8
Independent Claim
143 words
A method of testing a digital computer with data communications facilities that interface with the data communications network by means of request to send lines, receive data lines, transmit data lines and carrier detect lines wherein said method comprises the steps of: programming said computer to generate on said data transmit line a continuously repeating bit pattern, measuring the average direct current voltage of said data transmit lines by means of a direct currEnt voltage measuring apparatus, comparing said measurement of said direct current voltage rating apparatus to the average value for said generated bit pattern, placing said computer in a receive mode, applying a carrier detect signal to said carrier detect line, generating programmatically on said request to send line a data character, and comparing said data character generated with the bit pattern received in said terminal over said receive data line.
Claim 9
Dependent Claim
31 words
In the method claimed in claim 5 wherein said signal on said transmit data line is biased by means of an amplifier thereby producing a signal of a single voltage polarity.
Claim 10
Dependent Claim
21 words
The method defined in claim 5 wherein said direct current voltage measuring device is comprised of a direct current voltage meter.
Claim 11
Dependent Claim
49 words
The method defined in claim 5 wherein said carrier detect signal is simulated by applying a direct current voltage source to said carrier detect line. 9 The method as defined in claim 5 wherein said data character is generated by programmatically applying voltages to said request to send line.
Claim 12
Dependent Claim
44 words
The method as defined in claim 9 wherein said application of said voltage to said request to send line is timed by the instruction execution rate of said computer to conform with the estimated bit rate for which said computer is set to receive.
Claim 13
Dependent Claim
61 words
A programmatic method of testing the receive logic of a programmable data communication terminal wherein said method comprises the steps of: generating internally a predetermined bit pattern, placing said bit pattern on said terminals receive data line, simulating data reception mode for said terminal, and comparing said internally generated bit pattern with the bit pattern received over said receive data line.
Claim 14
Dependent Claim
61 words
A programmatic method of testing the receive logic of a programmable data communication terminal wherein said method comprises the steps of: generating internally a predetermined bit pattern, placing said bit pattern on said terminals receive data line, simulating data reception mode for said terminal, and comparing said internally generated bit pattern with the bit pattern received over said receive data line.
References Cited (Backward Citations)
US3622877A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |