Ace Translator 15.3.2.1532 Serial

The 9-pin DB9 style connector shown above is becoming more and more popular, even in the consumer area. The pinouts on the Type U and Type T DB9 connectors are shown in the table below. There are five DB9 connectors corresponding to five DB9 pinouts: DB9 is very common in the data communications equipment industry. DB9 is based on RS-232C, and was designed to replace the incompatibly 8-pin D-series connectors. Notice how the DB9 pinouts are based on those of RS-232 Type U. This commonality gives DB9 three advantages: (1) it is mechanically more robust; (2) it is mechanically simpler and simpler to assemble; and (3) it is easier to plug pin pairs into the board, providing space constraints.

The pin break-out is shown in the table at the right side of this page. This table is a simplified version. For a full description of DB9 pinouts, see the DB9 pinout specification document. Also note that the pinout for LVTTL signals is usually dependent on the state of the signal, which is not shown in the table below.

The 25-pin DB25 version of the DB9 style connector shown above is less common then the smaller, 9-pin version, but is better known. The pinout for the DB25 version of the DB9 style connector is shown in the table below. There are two different versions of DB25 connectors. The older, not electrically identical versions of the DB25 connector are shown with an arrow. This older version of the DB25 connector usually has narrow pins and is of inverted polarity. The newer, electrically identical version of the DB25 connector is shown below without the arrow. The older versions of the DB25 connector were designed to use a 5.5 inch floppy disk and designed to be manually opened. This raised some concern in the industry regarding potential safety consequences. d2c66b5586