The DB-25, with 25 pins, was the original standard and offers more signals for complex handshaking. The DB-9, a smaller 9-pin variant, is prevalent in modern applications due to its compact size.
RS 232 Wiring Colors Standards and Pin Configuration
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. The physical connector and its pin assignments define how data is transmitted, controlled, and synchronized between devices.
Originally intended for teletypewriters and modems, it established a robust electrical specification using ±12V logic levels. Identifying the correct pinout is crucial, as miswiring can lead to non-functional or damaged equipment.
RS 232 Wiring Colors Standards and Pin Configuration
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. Physical Connectors and Pinouts The most common physical connectors for RS-232 are the DB-9 and DB-25 connectors.
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