Tia Eia-232-f Specification ~upd~ Jun 2026

| Pin | Signal | Pin | Signal | |-----|--------|-----|--------| | 1 | Protective Ground | 14 | Secondary TxD | | 2 | TxD | 15 | Tx Clock (DCE source) | | 3 | RxD | 16 | Secondary RxD | | 4 | RTS | 17 | Rx Clock (DCE source) | | 5 | CTS | 18 | Local Loopback | | 6 | DSR | 19 | Secondary RTS | | 7 | Signal Ground | 20 | DTR | | 8 | DCD | 21 | Signal Quality Detect | | 9 | Reserved (Test) | 22 | RI | | 10 | Reserved (Test) | 23 | Data Rate Select | | 11 | Unassigned | 24 | Tx Clock (DTE source) | | 12 | Secondary DCD | 25 | Busy | | 13 | Secondary CTS | — | — |

The TIA/EIA-232-F standard defines a 1997-approved physical layer specification for unbalanced, serial communication between Data Terminal Equipment (DTE) and Data Circuit-Terminating Equipment (DCE). It establishes electrical characteristics with a maximum capacitive load of 2,500pF and defines specific, single-ended signal lines for control and data interchange. For more details, visit Texas Instruments AN-216 Summary of Well Known Interface Standards tia eia-232-f specification

Without the complexity of a network stack, there are fewer points of failure. | Pin | Signal | Pin | Signal

For over half a century, the serial communication interface known colloquially as "RS-232" has been a cornerstone of electronic data transmission. While many engineers and hobbyists use the terms "RS-232," "EIA-232," and "TIA-232" interchangeably, the specific revision represents a significant maturation of this standard. Published in 1997 by the Telecommunications Industry Association (TIA) and the Electronic Industries Alliance (EIA), Revision F was the first major update to incorporate the "D-subminiature 9-pin" (DE-9) connector as a normative part of the specification and to refine electrical testing parameters for modern high-speed applications. For over half a century, the serial communication

| Pin | Circuit | Name | Direction (DTE→DCE) | |-----|---------|------|----------------------| | 2 | BA | TxD | Out | | 3 | BB | RxD | In | | 4 | CA | RTS | Out | | 5 | CB | CTS | In | | 6 | CC | DSR | In | | 7 | AB | GND | — | | 8 | CF | DCD | In | | 20 | CD | DTR | Out | | 22 | CE | RI | In |

Unlike logic-level signals (0V and 5V), TIA/EIA-232-F uses bipolar voltage levels to ensure noise immunity over longer cables: +3V to +15V Logic '1' (Mark): -3V to -15V