DB25 Serial Adapters
Last Updated: February 12, 2025
Description
DB25 Serial Adapters are connectors that feature 25 pins arranged in a D-subminiature (D-sub) configuration. These adapters are used to facilitate serial communication between devices by providing a physical interface for data transmission. They are typically used to connect Data Terminal Equipment (DTE) and Data Communications Equipment (DCE), such as computers and modems, allowing for the exchange of data over a serial connection.
Working Principle
DB25 Serial Adapters operate based on the RS-232 standard, which defines the electrical characteristics and timing of signals, as well as the physical size and pinout of connectors. The RS-232 standard allows for serial, binary data transmission between DTE and DCE devices. The DB25 connector, with its 25 pins, provides multiple channels for data and control signals, enabling full-duplex communication, where data can be sent and received simultaneously. This makes them useful for applications requiring reliable and straightforward data exchange over short distances.
Applications
DB25 Serial Adapters are commonly used in various applications, including connecting computers to modems for internet access, interfacing with older industrial equipment, and linking devices in point-of-sale systems. They are also used in laboratory settings for connecting scientific instruments to computers for data collection and analysis.
Advantages over other Serial Adapters
One advantage of DB25 Serial Adapters over other types, such as DB9 connectors, is their ability to support more signal lines due to the higher number of pins. This allows for more complex communication protocols and additional control signals, which can be beneficial in applications requiring extensive data exchange and control.
Limitations
A significant limitation of DB25 Serial Adapters is their size, which is larger compared to more modern connectors like USB or SATA. This can make them less suitable for compact or portable devices. Additionally, the RS-232 standard, which DB25 connectors typically adhere to, supports relatively low data transmission speeds and short communication distances compared to newer standards like RS-485.
Considerations
When considering DB25 Serial Adapters, it's important to evaluate the initial cost, which can be higher due to their size and complexity compared to smaller connectors. Operating expenses may include the need for additional hardware to support the RS-232 standard. Durability is generally good, but the larger size can make them more prone to physical damage if not handled carefully. Accuracy in data transmission is reliable within the constraints of the RS-232 standard. Replacement and maintenance costs should be considered, especially in environments where connectors are frequently plugged and unplugged, as wear and tear can lead to connection issues over time.
from SIE Computing Solutions, Inc.
The Apollo 4020P Multiport serial communications controller enables up to four serial devices to be interfaced from one PCI Bus slot. It supports asynchronous data transfer rates up to 230.4 kbps, full duplex, simultaneously on all ports. The Apollo 4020P Multiport high-throughput asynchronous... [See More]
- Connector: DB25
- Network / Bus: PCI
- Serial Protocol: RS232/422/485
- Form Factor: PCB
from Patton Electronics Co.
Automatically connects two RS-232 devices. Comes with 3 foot ribbon cables (DB-25 M and F connectors on each end) [See More]
- Connector: DB25
- Network / Bus: Serial
- Serial Protocol: RS232
- Form Factor: In-Line
from OMEGA Engineering, Inc.
The OMG-COMM8-A provides the PC with eight RS-232 Asynchronous ports for terminals, data collection and other devices. This product includes extended AT interrupts, extended address range for UNIX, XENIX and QNX compatibility, and an interrupt status port for greater data throughput. Set each port... [See More]
- Connector: DB9; DB25; DB-78
- Form Factor: Desktop / Pedestal; PCB
- Serial Protocol: RS232
- Data Rate: 461
from Moxa Inc.
The intelligent C320Turbo serial boards are expandable and flexible COM/TTY solutions for RS-232 applications that require connecting up to 128 serial devices to one computer. The C320Turbo ’s on-board CPU and large dual-port memory take the load off host systems whose performance and... [See More]
- Connector: DB25
- Network / Bus: PCI; ISA
- Serial Protocol: RS232
- Form Factor: PCB
from Data Connect Enterprise, Inc.
The Model 3002 TCB interconnects two modems located in proximity of each other. Data is buffered and re-clocked to ensure its integrity when the modems are clocked independent of each other. The TCB enables users to connect a tail circuit to a modem sharing device or to a modem that does not... [See More]
- Connector: DB25
- Network / Bus: Serial
- Serial Protocol: RS232
- Form Factor: In-Line
from Sealevel Systems, Inc.
The 2103 USB isolated serial I/O adapter provides a single USB to RS-232 serial port allowing USB connectivity to legacy and non-USB compliant devices. Now your non-USB peripherals can have the same connection simplicity and ease of use as USB peripherals. The serial interface adapter provides... [See More]
- Connector: DB25
- Network / Bus: USB
- Serial Protocol: RS232
- Data Rate: 461
from SIE Computing Solutions, Inc.
The Apollo 4022P Multiport serial controller is a UniversalPCI board compatible with the PCI Local Bus Specification Revision 2.2. The Apollo 4022P card operates in either a 5.0V or 3.3V signaling environment. However, the card must be installed in a PCI slot that provides 3.3V power. The Apollo... [See More]
- Connector: DB25
- Network / Bus: PCI
- Serial Protocol: RS232/422/485
- Form Factor: PCB
from OMEGA Engineering, Inc.
The OMG-COMM8-PCI plugs into any IBM or compatible computer with the PCI bus, and provides eight RS-232 Async ports for communication servers, terminals, point of sale (POS) systems, and other data collection devices. The on-board interrupt status port provides maximum Windows flexibility. The... [See More]
- Connector: DB9; DB25; DB-37
- Network / Bus: PCI
- Serial Protocol: RS232
- Form Factor: Desktop / Pedestal; PCB
from Sealevel Systems, Inc.
The 2104 USB serial interface adapter provides one isolated RS-422 or RS-485 serial port for control and automation applications. Isolation helps to prevent damage caused by ground loops and surges. Power for the SeaLINK+485I is obtained directly from the USB cable, eliminating the need for wall... [See More]
- Connector: DB25
- Network / Bus: USB
- Serial Protocol: RS232/422/485
- Data Rate: 922
from SIE Computing Solutions, Inc.
The Saturn Multiport four-port PCI communications controllers provide the performance and reliability needed for high-speed serial communications. Data transfer rates up to 256 kbps synchronous and 230.4 kbps asynchronous, full duplex, are supported. The Saturn Multiport supports SPARC Solaris, Rev. [See More]
- Connector: DB25
- Network / Bus: PCI
- Serial Protocol: RS232/422/485
- Form Factor: PCB
from OMEGA Engineering, Inc.
The OMG-VERSACOMM4-EX provides the PC with four RS-232 Async links to data collection equipment and other devices. This product features extended interrupt support, individually selectable or sharable interrupts, and an onboard interrupt status port for maximum Windows flexibility. [See More]
- Connector: DB9; DB25; DB-37
- Form Factor: Desktop / Pedestal; PCB
- Serial Protocol: RS232
- Data Rate: 461
from Sealevel Systems, Inc.
The 2101 USB serial I/O product provides a single USB to RS-232 serial port for providing USB connectivity to legacy or non-USB compliant devices via a DB-25 connector. SeaLINK ® serial interface adapters support standard PC data rates up to 460K bps to provide you with the horsepower your... [See More]
- Connector: DB25
- Network / Bus: USB
- Serial Protocol: RS232
- Data Rate: 461
from SIE Computing Solutions, Inc.
The Saturn 4522P multiport serial controller is a Universal PCI board that is compatible with the PCI Local Bus Specification Revision 2.2. The Saturn 4522P card operates in either a 5.0V or 3.3V signaling environment. However, this card must be installed in a PCI slot that provides 3.3V power. The... [See More]
- Connector: DB25
- Network / Bus: PCI
- Serial Protocol: RS232/422/485
- Form Factor: PCB
from OMEGA Engineering, Inc.
The OMG-COMM4-LPCI-DB25 Low Profile PCI serial interface provides four RS-232 serial ports, each capable of data rates to 460.8K bps. Each RS-232 port implements all modem control signals for maximum compatibility with a wide range of peripherals. The board is MD1 Low Profile and Universal Bus (3.3... [See More]
- Connector: DB9; DB25
- Network / Bus: PCI
- Serial Protocol: RS232
- Form Factor: Desktop / Pedestal; PCB
from Sealevel Systems, Inc.
The 2102 USB serial interface adapter provides a single USB to RS-422, RS-485, or RS-530 serial port for providing USB connectivity to legacy or non-USB compliant devices. SeaLINK ® serial interface adapters support standard PC data rates up to 921.6K bps to provide you with the horsepower your... [See More]
- Connector: DB25
- Network / Bus: USB
- Serial Protocol: RS232/422/485
- Data Rate: 922