653x Cable Adapter: Digital Instruments Accessory Guide

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.
• To determine compatibility of your 653x Cable Adapter with your NI Hight-Speed Digital I/O or HSDIO device or module, or your NI cable, visit Digital Instrument Cable and Accessory Compatibility.
• To create your own cable or test fixture, or to repair an NI Digital cable or accessory, visit NI Digital Instrument Custom Cables, Replacement Connectors, and Screws. First, note the connector information found on this page.

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.

^{Figure 1: NI 653x Cable Adapter Without the Cover}

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).

Accessory Side Connector and Pinout

68-pin 0.050 SCSI D-Type Connector Female (Receptacle)

Cable Side Connector and Pinout

68-pin 0.8 mm VHDCI (Receptacle)

Part Number

P/N 195846-01

Published Resources

653x Cable Adapter User Guide

653x Cable Adapter Dimensional Drawing

Physical Characteristics

Screw Terminal Wiring Specifications

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.

Note: The example diagram below uses the PXIe-6535, however the 653x Cable Adapter compatibility is not limited to this device. For more information on the 653x Cable Adapter compatibility please see the Compatible Devices, Modules, and Cabling for the 653x Cable Adapter.

^{Figure 2: Connection Diagram}

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.  

^{Figure 3: Screw Terminal Access to PFI Lines} 

Some devices and modules listed in the table have extended compatibility information, which is linked to in their Compatibility Guide. Refer to your device or module's user manual or user guide for more information. For additional compatibility information please see the NI Digital Cable and Accessory Compatibility Guide. 

• Learn about specifications, model differences and other common questions for other Digital accessories.
• Learn about the compatibility of NI Digital Instruments and modules with NI Digital cables and accessories.
• Find the parts needed to make a custom cable, breakout fixture, or replace connectors and screws on NI Digital hardware.
• Browse dimensional drawings for NI cables and accessories.