Hitachi PSC-A32MN Installation And Operation Manual page 15

Installation
3 Connect the wiring to the terminal board of the central station.
Terminal Board
TB1 For power supply
TB2 For H-LINK transmission
CN1 ~ 3 For external input/output
4 Fix the switch box (field-supplied JIS switch box for 2 switches (with cover) (JIS C 8340)) using the accessory fixing screw
(M4 × 16 mm).
7 PMML0332A rev.0 - 05/2015
Use Connection procedure
M3 screw-on terminal
Round terminal connection
Tightening torque 0.5N·m
3-pin connector
Insert connector cords (accessory)
until hearing a click.
M4 screws
(Q'ty: 4)
H-LINK (Non-pole)
Terminals for external input/output.
Refer to section
Switch box (Field-supplied)
(JIS C8340 2 switches (with cover))
FG
AC100 to 240V
"5.4.2 Optional Function Setting"