Hitachi GR2000 Series Installation Manual page 182

Be careful when connecting the cables attached to VX-8 to the devices
that the connector insertion faces are reversed between the lower side
connectors (LINE 0, LINE 1, and LINE 4, LINE 5) and the upper side
connectors (LINE 2, LINE 3, and LINE 6, LINE 7).
LINE#7 LINE#6 LINE#5 LINE#4 LINE#3 LINE#2 LINE#1 LINE#0
Figure 3-74 Line numbers for the cables attached to NWVX-8