4.2 Communication Specifications
Tables 4.2 and 4.3 summarize the communication specifications.
Table 4.2 Hardware Specifications
Item Specifications Remarks
No. of inverters
connected
One inverter for one multi-function keypad
Connection cable Shall meet the US ANSI/TIA/EIA-568A
Category 5 standard
(10BASE-T/100BASE-TX, straight).
A remote operation extension cable is
available as an option (CB-5S,
CB-3S, or CB-1S, depending on the
distance).
Maximum
communication distance
20 m
Connector RJ-45 connector See Table 4.3.
Table 4.3 RJ-45 Connector Pin Assignment
Pin #
Signal
name
Description Remarks
1, 8 Vcc DC power source for multi-function
keypad (5 V)
2, 7 GND Signal ground
3, 6 NC Unassigned (reserved)
4 DX - RS485 communication data ( - )
5 DX + RS485 communication data ( + )
SW3 for the terminating resistor on the control circuit board in the inverter must be set to OFF (open).
4.3 Transmission Specifications
Table 4.4 summarizes the transmission specifications.
Table 4.4 Transmission Specifications
Item Specifications Remarks
Area code No need to specify.
Communication protocol Modbus-RTU
Synchronization system Asynchronous Start-stop bit
Communication system Half-duplex
Communication speed
(Baud rate)
19200 bps
Parity Even parity
Stop bit length 1 bit
Error checking CRC-16
There is no need to specify function
codes y01 through y10 for RS485
communication, which will be ignored
anyway.
4-2
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