- Stock: In Stock
- Model: 45012
DIGITUS Null-Modem RS-232 Cable DB9 Female to Female 1.8 m
The DIGITUS Null-Modem cable is designed for direct serial data communication between two compatible devices equipped with a 9-pin D-Sub / DB9 interface. The cable features a DB9 female connector on both ends and uses crossed transmit and receive signal wiring.
Thanks to its Null-Modem wiring, the cable enables direct data exchange between two computers or between a computer and another compatible serial device without the use of a modem. Cable length is 1.8 m.
Important: this is a Null-Modem cable with crossed wiring, not a standard serial extension cable with straight-through 1:1 wiring. Check which wiring configuration your equipment requires before ordering.
Key Benefits
- Direct connection between two serial devices without an additional modem.
- DB9 female connector on both ends for compatible RS-232 equipment.
- Crossed Null-Modem wiring with transmit and receive signals connected appropriately.
- 1.8 m cable length provides practical flexibility for desktop, workshop and service applications.
- Connector fastening screws help prevent accidental disconnection during use.
- Nickel-plated contacts provide a reliable electrical connection.
Applications
The Null-Modem cable is suitable for serial communication between compatible devices, for example:
- direct connection between two computers,
- connection between a computer and a satellite receiver,
- configuration and updating of older devices,
- industrial and service equipment with an RS-232 interface,
- diagnostic devices and controllers,
- other equipment requiring a DB9 Null-Modem connection.
Null-Modem Crossed Pin Wiring
The cable uses crossed pin wiring in which the transmit and receive signals are appropriately exchanged between the two connected devices.
- Pin 1 ↔ Pin 4
- Pin 2 ↔ Pin 3
- Pin 3 ↔ Pin 2
- Pin 4 ↔ Pin 1
- Pin 5 ↔ Pin 5
- Pin 7 ↔ Pin 8
- Pin 8 ↔ Pin 7
- Pin 9 ↔ Pin 9
- Shield ↔ Shield
Because of this wiring configuration, the cable is not equivalent to a standard DB9 cable with straight-through 1:1 pin connections.
Secure Connector Fastening
Both D-Sub 9-pin connectors are equipped with fastening screws. Once connected, the plugs can be secured to the device, reducing the risk of accidental disconnection during operation.
This design is particularly useful for service, industrial and professional equipment where a stable serial data connection is important.
Check Compatibility Before Purchase
Before ordering, check the connector type and required serial wiring of your device. For correct operation, the equipment must require:
- D-Sub / DB9 9-pin connection,
- female connectors on the cable,
- Null-Modem / crossed wiring,
- serial data communication.
If your equipment requires a standard serial cable with straight-through 1:1 wiring, this Null-Modem cable is not suitable.
Reliable Null-Modem Connection for Serial Devices
The DIGITUS 1.8 m Null-Modem DB9 cable is a practical solution for direct serial communication between two compatible computers, receivers, controllers or other professional equipment.
Package contents: Null-Modem D-Sub 9-pin female ↔ D-Sub 9-pin female cable, length 1.8 m.
Before ordering: check the connector type and confirm that your equipment requires crossed Null-Modem wiring.
