Toshiba BMS-IFMB1280U-E Installation Manual page 15

Modbus interface
LED5
SW3
1 2 3 4
SW5 SW6
SW8
1 2
REQUIREMENT REQUIREMENT
• RS-485 termination resistance select switch SW5.
Set "120 ohm" only when the Modbus interface address SW=1, and set "open" for other Modbus interfaces.
• The Uh Line termination resistance is set on the air conditioner side. Set SW6 to "open".
LED4 LED2
SW1 Modbus interface address set switch
LED3 LED1
1-F
SW1
SW2
0
SW2 Test switch (0 usually)
Bit1: Uh Line communication setting mode switch.
SW7 SW4
Bit2: Switches the LED5 display for test runs.
SW3
Bit3, 4: RS-485 baud rate setting (9600/19200/38400) bps.
SW4 Test switch
SW5 RS-485 termination resistance
select switch
SW6 Uh Line termination resistance
select switch
SW7 Reset switch
SW8 Test switch (all OFF usually)
LED1 Power indicator
LED2 RS-485 communication status indicator
LED3 Uh Line communication status indicator
LED4 Uh Line communication error indicator
LED5 Test indicator
OFF: Normal circumstance; ON: Central controller ID setting mode
OFF RS-485 communication status indicator.
ON Uh Line communication status indicator.
3 OFF, 4 OFF 9600 bps, 3 ON, 4 OFF 19200 bps,
3 OFF, 4 ON 38400 bps, 3 ON, 4 ON 19200 bps.
Installation Manual
Modbus interface address
Not used
ON ON
120 ohm Open
ON ON
100 ohm Open
14-EN