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psdev01:~$ ssh drp-neh-cmp020 ~/git/lcls2/psdaq/build/psdaq/pgp/kcu1500/app/kcuStatus | grep txLinkId
            txLinkId : fb009c33 fb019c33 fb029c33 fb039c33 fb049c33 fb059c33 fb069c33 fb079c33
psdev01:~$ 

NOTE: datadev_1 shows up first!  You can see this by providing a -d argument to kcuStatus:

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(ps-4.5.10) drp-neh-cmp024:lcls2$ ./psdaq/build/psdaq/pgp/kcu1500/app/kcuStatus -d 1 | grep -i linkid
            rxLinkId : fc000000 fc010000 fc020000 fc030000
            txLinkId : fb009c3b fb019c3b fb029c3b fb039c3b
(ps-4.5.10) drp-neh-cmp024:lcls2$ 

The lane number (0-7) is encoded in the 0xff0000 bits.  The corresponding hsdpva is:

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