Physical Connectors and Pinouts The most common physical connectors for RS-232 are the DB-9 and DB-25 connectors. 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.
RS 232 Pinout Arduino Serial: Connecting DB9 Connectors
Identifying the correct pinout is crucial, as miswiring can lead to non-functional or damaged equipment. The DB-25, with 25 pins, was the original standard and offers more signals for complex handshaking.
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.
RS 232 Pinout Arduino Serial Connection Guide
Despite the rise of faster interfaces like USB and Ethernet, the simplicity and reliability of RS-232 ensure its continued use in environments where noise immunity and long cable runs are critical. This standard, established decades ago, remains relevant in industrial automation, scientific instrumentation, and point-of-sale terminals.
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