The SLVD and HPD use RS485/RS422 communication.
Standard PC's 9pin d-sub com ports are RS232 and newer PCs without 9pin COM ports have USB and USB to RS232 adapters are readily available.
Below is how to connect, using a B&B Electronics' 485BAT3 adapter to a PC and to a sLVD or the newer sLVD-N:
No connection for the +12vdc on the 485BAT3.
For upload/download using MotionWiz software: MotionWiz_basic.pdf
Notes on installing MotionWiz, from upgrade.chm in MotionWiz installer:
10/18 Added SLVD-N, Added pdf