Toa RM-971 - Manual (Page 31)

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8.4.3. Connection diagrams
Use shielded, heat-resistant, twisted paired cable for connection.
Terminal plate of the first remote control unit (address 0)
and fifth unit (address 4).
Terminal plate of the third remote control unit (address 2)
and seventh unit (address 6). Terminal plate of the fourth remote control unit (address 3)
and eighth unit (address 7).
Terminal plate of the second remote control unit (address 1)
and sixth unit (address 5).
JP-0410's front-mounted terminal block (upper row)