National Instruments SCXI-1121 - Manual (Page 90)

Chapter 4 Register Descriptions
SCXI-1121 User Manual 4-8 www.natinst.com
1 SCANCONEN Scan Control Enable—When set, this bit enables the
SCANCON lines. When clear, all SCANCON lines are
disabled (high).
0 CLKEN Clock Enable—When set, this bit enables TRIG0 as a
clock for the hardscan circuitry. When clear, TRIG0 is
disabled.