cncmill@cncmill-desktop:~$ halcmd show pin | grep -i index
04 bit I/O FALSE axis.0.index-enable
04 bit I/O FALSE axis.1.index-enable
04 bit I/O FALSE axis.2.index-enable
04 bit I/O FALSE axis.3.index-enable
04 bit I/O FALSE axis.4.index-enable
04 bit I/O FALSE axis.5.index-enable
04 bit I/O FALSE axis.6.index-enable
04 bit I/O FALSE axis.7.index-enable
04 bit I/O FALSE motion.spindle-index-enable
06 bit OUT FALSE ppmc.0.encoder.00.index
06 bit I/O FALSE ppmc.0.encoder.00.index-enable
06 bit OUT FALSE ppmc.0.encoder.01.index
06 bit I/O FALSE ppmc.0.encoder.01.index-enable
06 bit OUT TRUE ppmc.0.encoder.02.index
06 bit I/O FALSE ppmc.0.encoder.02.index-enable
06 bit OUT FALSE ppmc.0.encoder.03.index
06 bit I/O FALSE ppmc.0.encoder.03.index-enable