What is DB9 and DB25?

What is DB9 and DB25?

DB25 and DB9 serial cables are the renowned types of D-sub connectors, used in PCs for serial and parallel ports. The High-Density DB style is another type of D-sub connector which looks like a regular DB connector. Often called ‘HD’ connectors they have three rows of pins instead of two.

What is a null modem DB9 cable?

A null modem cable is a RS-232 serial cable where the transmit and receive lines are crosslinked. In some cables there are also handshake lines crosslinked. In many situations a straight-through serial cable is used, together with a null modem adapter. The adapter contains the necessary crosslinks between the signals.

What is DB25 connector?

The DB25 connector is an analog socket, with 25 pins, from the D-Subminiatures (D-Sub) connector family. The DB25 connector is mainly used in serial and parallel ports, allowing asynchronous data transmission according to the RS-232 standard (RS-232C).

What is a null modem connection *?

A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between. For this to happen, the Transmit (TXD) and Receive (RXD) pins on one of the serial connectors are flipped.

How many minimum wires are needed for a null modem cable?

Direct Serial Connections (DTE to DTE) There are several classes of null modem cables, each with many variations: Minimum 3- or 4-Wire Cable. In this cable, RD and TD are cross connected and Signal Ground goes straight though (and optionally also Frame Ground).

How do I know if I have a null modem serial cable?

To tell if your NI serial cable is null modem or straight though, search for its part number in NI Serial Hardware Specifications and Features and note the cable type in the description. Alternatively, you can use a handheld DMM to test continuity on the individual pins of your serial cable.

Is a null modem cable the same as a serial cable?

The pinout of the serial connectors on both sides of the cable are exactly the same with a straight-through serial cable. A null modem serial cable (frequently called a crossover cable) is used to connect two DTE devices together without the use of a DCE device in between.

What is the function of DB25?

As with the DB9 connector, the DB25 connector is mainly used for serial connections, allowing for the asynchronous transmission of data as provided by standard RS-232 (RS-232C). It is also used for parallel port connections, and was originally used to connect printers, and as a result is sometimes known as a printer port (LPT).

What is the purpose a DB25?

TASCAM and many others are using a connection over DB25 connectors,which has been standardized into AES59.

TASCAM initially used their TDIF connection over DB25 connectors for their multi-track recording audio equipment.

Roland used DB25 connectors for their multi-track recording audio equipment ( R-BUS ).

What does DB25 mean?

DB-25 is part of the D-subminiature (D-Sub) connector plug and socket family for computer and communication devices. DB-25 is a 25-pin electrical connector for serial and parallel computer ports.

What is a DB25 connector used for?

The DB25 (originally DE-25) connector is an analog 25-pin plug of the D-Subminiature connector family (D-Sub or Sub-D). As with the DB9 connector, the DB25 is mainly used for serial connections, allowing for the asynchronous transmission of data as provided by standard RS-232 (RS-232C).

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