Physical Connectors and Pinouts The most common physical connectors for RS-232 are the DB-9 and DB-25 connectors. The DB-9, a smaller 9-pin variant, is prevalent in modern applications due to its compact size.
RS 232 Pinout Terminal Server: Understanding Connector Configurations
Historical Context and Evolution The RS-232 standard, introduced in 1960 by the Electronic Industries Alliance, was designed to standardize communication between data terminal equipment and data communication equipment. Understanding the RS-232 pin configuration is essential for anyone working with legacy serial communication systems.
Originally intended for teletypewriters and modems, it established a robust electrical specification using ±12V logic levels. The DB-25, with 25 pins, was the original standard and offers more signals for complex handshaking.
RS 232 Pinout Terminal Server: Understanding Connector Pin Assignments
DB-9 Pin Configuration Pin Function Signal Name 1 Carrier Detect CD 2 Received Data RXD 3 Transmitted Data TXD 4 Data Terminal Ready DTR 5 Signal Ground SG 6 Data Set Ready DSR 7 Request to Send RTS 8 Clear to Send CTS 9 Ring Indicator RI DB-25 Pin Configuration Pin Function Signal Name 1 Shield Ground SG 2 Transmitted Data TXD 3 Received Data RXD 4 Request to Send RTS 5 Signal Ground SG 6 Data Set Ready DSR 7 Signal Ground SG 8 Clear to Send CTS 20 Data Terminal Ready DTR 22 Ring Indicator RI. The physical connector and its pin assignments define how data is transmitted, controlled, and synchronized between devices.
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