Why the parent system matters more than the accessory type
Almost everything in a data-acquisition accessories catalogue — cables, couplers, connectors, interface and expansion modules, even consumables like printer cartridges and carrying cases — is built for a specific parent instrument or system, not as a universal part. A channel-expansion module for one manufacturer's 32-channel thermocouple system, for instance, generally will not fit a different model even from the same manufacturer's own range. That makes "For Use With" the single most important spec to confirm before ordering, ahead of connector type, cable length, or any other detail.
Working through a fragmented accessory list efficiently
The fastest way to narrow a large accessory catalogue down to what you need is to filter by accessory type first — cable, coupler, interface module, connector, or consumable — and then by your exact instrument model. For organisations standardising on a fieldbus protocol such as PROFIBUS or a CAN-family bus (CAN, CAN FD, LIN), it's also worth checking which interface modules your existing hardware actually requires before mixing brands, since bus-level compatibility doesn't automatically follow from two devices supporting "the same" protocol in general terms.
When the exact accessory isn't listed
Because these accessories are so model-specific, no single catalogue will carry every part for every instrument in the field. Submitting the exact instrument make and model as part of an RFQ — rather than a general description — is the most reliable way to get the correct part sourced, including for accessories not yet listed.