Toshiba BMS-IFMB1280U-E Installation Manual page 13

Modbus interface
Modbus-Master
(Locally procured)
A B
(+) (-)
The shielded wire of the RS-485
communication cable must be earthed
on address 1
CAUTION: RS-485 communication
cables A(+) and B(-) have polarity.
Be careful when connecting the RS-
485 wires.
RS-485 termination resistance is set
by Modbus interface of address
setting switch SW1=1 only.
Do not connect the shielded wire of
Uh Line communication cable to the
earth.
LINK(Uh) U3 and
U4 have no polarity.
Set the RS-485 termination resistance on
the address1 unit (Modbus interface
address SW1=1) and host system. Do not
set it here.
Uh Line termination resistance
Refer to "Termination resistance
SW1
setting"(P.6)
4
SW5 SW6
U4 U3
U2 U1
U2 U1
SW1
1
SW5 SW6
U4 U3
U2 U1
U2 U1
Set the Modbus interface address with SW1. Assign 1 to
F(15) to each address to avoid duplication.
CAUTION: The SW1 setting is read when the power is
turned on. Push the reset switch SW7 after changing the
address.
Installation Manual
U4 U3 U4 U3
U2 U1
U2 U1
U2 U1
U4 U3 U4 U3
U2 U1
U2 U1 U2 U1
12-EN