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