Carrier PIC 5+ - Safety Considerations; Installation Safety Considerations; Maintenance Safety Considerations

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3.1.3 - IO Board
IO Board is Input/output Board, and it is supplied from a 24VAC supply referred to earth.
For the IOB input / output description, please refer to section 3.4.
3.1.4 - LEN -> MODBUS Protocol Converter
PIC5 Port
LED1
SEND
LED2
RECEIVE
LED3
POWER
LED4
RUNNING
LED5
ERROR
LED6
SEND
LED7
RECEIVE
VFD Port
+
-
GND
+
-
Unused
Unused
GND
24V AC
GND
24V
8
7
6
5
1
ON
RS-232
RS-485
2 Wire
4 Wire
OFF
2
3
4
LEN -> MODBUS Protocol converter is connected between IOBs and VFD. Please refer the decription in the above picture.