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. The DB-25, with 25 pins, was the original standard and offers more signals for complex handshaking.
RS 232 DB25 Pinout Comparison and Key Differences
The physical connector and its pin assignments define how data is transmitted, controlled, and synchronized between devices. The DB-9, a smaller 9-pin variant, is prevalent in modern applications due to its compact size.
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.
RS 232 DB25 Pinout Comparison and Key Signal Assignments
This standard, established decades ago, remains relevant in industrial automation, scientific instrumentation, and point-of-sale terminals. Understanding the RS-232 pin configuration is essential for anyone working with legacy serial communication systems.
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