653x Cable Adapter: Digital Instruments Accessory Guide
Updated Oct 16, 2020
This guide addresses many common questions for the 653x Cable Adapter, which allows you to easily interface your SCSI 68-pin D-type accessories with VHDCI 68-pin devices or modules. Whether you need mappings or pinouts for wiring, or creating custom configuration this guide will provide a short summary, and then link to other resources like manuals, specifications, dimensional drawings, and more.
This guide is intended to cover the 653x Cable Adapter which was designed for use with NI High-Speed Digital I/O or HSDIO devices and modules. It does not cover use with other NI product hardware families like DAQ, C Series, or R Series although some may use similar adapters.
To find more information about other NI Digital accessories and general information that applies to all Digital accessories, visit the NI Digital Accessories Guide.
The 653x Cable Adapter was developed to enable users of the PXI-6533 or PXI-6534 and PCI-6533 or PCI-6534 to migrate to the PCIe-6535B, PCIe-6536B, PCIe-6537B and PXIe-6535, PXIe-6536, PXIe-6537. The adapter can also be used to migrate from the PXI-6533 or PXI-6534 and PCI-653 or PCI-6534 to the 654x series and the 655x series. The adapter enables you to migrate to the new devices without having to replace fixtures or accessories with SCSI 68-pin D-type connectors. The 653x Cable Adapter is a 68-pin SCSI to 68-pin VHDCI adapter that is used by attaching to the end of a 68-pin VHDCI cable.
The 653x Cable Adapter is only recommended when upgrading from the 6533/4 to an HSDIO device with a VHDCI 68-pin connector and is not recommended for new designs. If you are designing a new system or application NI recommends using an accessory with a VHDCI 68-pin connector instead of the 653x Cable Adapter. For more information on compatible accessories for your device please see the Digital Instrument Cable and Accessory Compatibility Guide.
Quick Specifications, Manuals, Quick Reference Labels, and Dimensional Drawings
This section contains a summary of information frequently sought when installing, wiring up or configuring the 653x Cable Adapter. More detailed information can be found in the linked additional resources below. Dimensional drawings can be downloaded for free and are available in 2D and 3D formats; they contain size measurements and other helpful information, and are available in several popular formats, such as PDF, AutoCAD (.dxf, .dwg, and IGES), SolidWorks, and STEP (.stp).
653x Cable Adapter Quick Specifications and Published Resources
The diagram below displays the proper sequence to connect your device, cable, adapter and test fixture. The 653x Cable Adapter is used between the VHDCI cable and the SCSI test fixture. As seen above, the 653x Cable Adapter has a 68-pin 0.050 SCSI D-Type Connector Female (Receptacle) Connector, as such, when using the adapter with a custom test fixture, the test fixture must have a 68-pin 0.050 SCSI D-Type Connector Male (Plug) Connector. For more information on what connector to use on your custom test fixture when using the 653x Cable Adapter please see the Digital Instruments Custom Cables, Replacement Connectors and Screws Guide.
Additionally, the 653x Cable Adapter gives the user direct access to the PFI lines via screw terminals as seen in Figure 3. The PFI lines must be manually connected through the screw terminals to ensure correct signal routing. Note that not all PFI lines can route from the PCI-6533/4 or PXI-6533/4 to other HSDIO devices. See your specific device's User Manual for more information on what PFI lines can be used. For an example of how to connect PFI lines and how to modify the PFI lines in your program please see the 653x Cable Adapter User Guide linked above.