Cable Spec 41 - NULL MODEM Crossover DB9 to DB25 Pinout
Written by Michael Cone
Updated at January 26th, 2026
- VTube Update Articles
- VTube Technical Articles
- Downloadable Resources
- VTube Videos
- Measuring Devices
- Utility Software
- Partners
- Benderlink Hardware
- Bending Terminology
- Benderlink Software
- Benderlink Update Articles
- CNC Bender ProControl
- Bender to XYZ
- General Software Topics
- Windows Technical Articles
- TubeCAD
This pinout is the null modem standard that works with all MiiC benders that use the MiiC BSC protocol.
If you purchase a pre-made null-modem cable, it will most likely contain this pinout schematic. A purchased cable may also contain DB9 pin 9 to DB25 pin 22 RI - "ring indicator". Since the RJ45 adapters have eight wires, it is necessary to omit this last connection.
.png)