D-Sub Serial Adapter DB25 Male to DB9 Female
PCM Cable Co., Ltd. is one of the leading D-Sub Serial Adapter DB25 Male to DB9 Female manufacturers and suppliers in China. Welcome to wholesale high quality customized products at discount price from our factory. Contact us for quotation and free sample.
The newly developed Premier Cable PCM-KW-688 is a compact DB25 Male to DB9 Female D-Sub serial adapter designed for applications where existing equipment provides a DB25 female interface while the available service cable, serial connection or peripheral interface uses a DB9 male connector.
The adapter integrates DB25 Male and DB9 Female interfaces into a compact, cable-free form factor that can be installed directly between compatible D-Sub connections. It helps system integrators and service engineers manage connector-size and gender differences between legacy and newer serial equipment.
Core Advantage: Designed for DB25 Female Equipment
PCM-KW-688 features a DB25 Male to DB9 Female configuration, designed to connect equipment with a DB25 female port to a DB9 male cable. Unlike PCM-KW-686 and PCM-KW-687, its connector arrangement addresses this specific mating requirement. Selection should be based on actual connector gender, position count and wiring requirements rather than the adapter name alone.
Stable Connection: Mechanical and Electrical Compatibility
Reliable connectivity requires correct mating of both D-Sub interfaces, compatible retention hardware and no mechanical interference. Electrical verification must also cover pin mapping, TxD/RxD routing, signal ground, handshake lines and DTE/DCE roles. A physically compatible connector does not guarantee communication; both mechanical and electrical requirements must be satisfied.
Installation Requirements: Verify Interfaces and Communication Settings
Before installation, verify the DB25 female equipment port, DB9 male cable, communication standard, DTE/DCE roles, baud rate, data bits, parity and stop bits. The PCM-KW-688 drawing specifies nine signal connections and shell continuity between DB25 and DB9. Use this confirmed wiring diagram as the selection reference, and check the equipment documentation to ensure signal direction and communication compatibility.
Compatibility Notice
Always verify TX, RX, ground, handshake signals and the complete pin assignment before connecting equipment. Physical D-Sub compatibility does not guarantee electrical or communication compatibility.
Products Specification
|
Product Name |
DB25 Male to DB9 Female D-Sub Serial Adapter |
| Product Type | Compact D-Sub Adapter |
| Premier Cable P/N | PCM-KW-688 |
| Connectors | DB25 Male + DB9 Female |
| Positions | 25-Position to 9-Position |
| Overall Length | 49.5 ±1 mm |
|
DB25 Width |
55.5 mm |
| DB9 Width | 33.9 mm |
Products Display
Product Features
DB25 Male to DB9 Female Interface Combination
PCM-KW-688 integrates DB25 Male and DB9 Female connectors, providing a physical transition between 25-position and 9-position D-Sub interfaces for compatible equipment and cables.
Direct-Mount Cable-Free Design
The compact direct-mount design eliminates the need for an additional conversion cable, reducing cable loops and intermediate connections in space-constrained equipment panels, cabinets and test benches.
Legacy Equipment Connectivity
Designed for legacy controllers, measurement instruments and data-acquisition equipment with DB25 female ports, enabling connection to compatible DB9 male serial cables after protocol and pinout verification.
Passive Signal-Mapping Architecture
The passive wiring architecture routes signals between DB25 and DB9 according to the specified pin mapping. It does not perform protocol or voltage-level conversion; functionality depends on the confirmed wiring diagram.
Core Application Scenarios
Data Acquisition Systems
In DAQ systems, loggers, laboratory controllers and industrial acquisition systems, different equipment generations can result in inconsistent DB25 and DB9 serial interfaces.
PCM-KW-688 is suitable as a physical interface adapter after the communication standard, signal mapping and handshake requirements have been verified.
Industrial Automation Equipment
Some long-service-life PLCs, industrial controllers, motion-control systems and communication modules may still use DB25 female serial ports, while service cables or upgraded industrial computers use DB9 male interfaces.
PCM-KW-688 can provide a compact transition between these equipment interfaces and reduce the need to manufacture an entirely new cable solely because the external connector formats differ.
The specific PLC manufacturer pin assignment should be checked before use because D-Sub interfaces can use proprietary wiring on different automation platforms.
Core Performance Advantages
● Reduces Legacy-System Rewiring
When the pinout matches, the adapter allows existing DB25 equipment and DB9 serial cables to remain in use, reducing unnecessary interface modifications, replacement cable purchases and maintenance downtime.
● Reduces Cascaded Connection Points
Consolidating the required transition into one adapter reduces cascaded mating points, helping limit loose contacts, incorrect accessory selection and troubleshooting complexity while improving connection maintainability.
● Improves Legacy Equipment Service Efficiency
A standardized adapter reduces the preparation involved in sourcing cable components, soldering connectors or fabricating temporary conversion leads, supporting efficient interface adaptation in repair centers, factories and laboratories.
Frequently Asked Questions
Q1：Is It an RS-232 Protocol Converter?
A1：No.PCM-KW-688 is a passive adapter and contains no active protocol-conversion electronics.It does not perform USB-to-RS232, RS232-to-RS485, parallel-to-serial or TTL-to-RS232 conversion.
Q2：Is PCM-KW-688 Compatible with All RS-232 Equipment?
A2：Universal compatibility cannot be guaranteed.Connector gender, DB25 pinout, DB9 pinout, DTE/DCE configuration, TxD/RxD routing and handshake signals must be verified.Using the same communication-standard name does not guarantee that every manufacturer implements the equipment interface in exactly the same way.
Q3：Can the Housing and Retention Hardware Be Customized?
A3：Housing color, molded shells, metal shells, jack screws, thumb screws, logos, labels and packaging can be evaluated according to project requirements.The equipment mechanical drawing should be provided to verify installation clearance and jack-post dimensions.
Products Drawing
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