SLLA607 may   2023 MAX3222E , MAX3227E , MAX3243-EP , MAX3243E , SN75155 , TRS202E , TRS3122E , TRS3221E , TRS3223-Q1 , TRS3243E

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2RS-232 Standard Overview
    1. 2.1 Electrical Overview
    2. 2.2 Functional Overview
    3. 2.3 Mechanical Overview
  6. 3RS-232 Transceiver Key Specification Overview
    1. 3.1 Electrical Characteristics
    2. 3.2 Switching and Timing Characteristics
    3. 3.3 Additional Features on Select TI RS-232 Transceivers
  7. 4RS-232 Transceiver Selection Guide
  8. 5References

2.3 Mechanical Overview

The final portion of the RS-232 standard focuses on the mechanical interface for RS-232 connections. The two commonly-used connectors are DB25 and DB9S. The DB25 connector allows the RS-232 functional signal to each have a connection point. The more common DB9S connector supports the eight most common functional RS-232 signals (as previously discussed) plus a common ground connection.