Serial Connector Interface for Automatic Null-Modem Switching
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Solution Overview
Problem
The existing methods for establishing a null-modem connection between data terminal equipment require manual swapping of cables or adapters, which is labor-intensive and cluttered with extra hardware, making it inconvenient to switch between regular RS-232 and null-modem connections.
Innovation Solution
A connector interface with switches and a microprocessor that electronically cross-links signals to switch between straight-through and null-modem connections, allowing for automatic conversion between the two without the need for physical cable swapping.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If manual swapping of cables or adapters is used to switch between regular RS-232 and null-modem connections, then connection flexibility is improved, but device complexity and ease of operation deteriorate due to labor-intensive manual intervention and hardware clutter
Solution Approach 1:
The patent combines both regular RS-232 and null-modem connection capabilities into a single cable assembly. The cable includes a connector with multiple contacts that can be configured to provide either straight-through connection or cross-linked null-modem connection, eliminating the need for separate cables and adapters.
Solution Approach 2:
The patent replaces the manual mechanical swapping of cables and adapters with an electronic switching mechanism. A switch component controlled by a microprocessor automatically configures the connection type (straight-through or cross-linked) based on detection signals, eliminating manual intervention and reducing hardware clutter.
2Reliability
If manual swapping of cables is used to test and determine connection type, then connection reliability is improved by ensuring proper connection, but productivity deteriorates due to labor-intensive testing and swapping process
Solution Approach 1:
The cable assembly performs self-testing to determine whether a null-modem or straight-through connection is required. The microprocessor controls the switch to configure the appropriate connection type based on detection signals, automatically establishing the correct connection without requiring manual testing or intervention.
3Adaptability or versatility
If multiple cables and adapters are used to support both connection types, then adaptability is improved, but ease of operation deteriorates due to inconvenient manual swapping and cluttered interconnections
Solution Approach 1:
The cable assembly is designed as a universal solution that can provide both regular RS-232 and null-modem connections through a single device. The connector includes all necessary contacts and the switch component can configure the connection type, making the cable adaptable to different connection requirements without needing multiple separate cables or adapters.
Data Source
AI summary
An apparatus for enabling a connection over a serial interface is provided. The apparatus is a connector interface that includes a plurality of switches configured to cross-link signals to switch a straight-through connection to a null-modem connection. Additionally included is a microprocessor in communication with the plurality of switches, whereby the microprocessor is capable of interfacing with the plurality of switches to trigger the switch to the null-modem connection. Circuitry and a hardware implemented method for enabling a connection over a serial interface also are described.