4-2
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 Remote Keypad
Connection
cable
Shall meet the US ANSI/TIA/EIA-568A Category 5
standard (10BASE-T/100BASE-TX, straight).
Remote Operation
Extension Cables are
available as options
(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 Remote Keypad
5 V
2, 7
GND
Signal ground
GND
3, 6
NC
Unassigned (reserved)
4
DX -
RS485 communication data ( - )
5
DX +
RS485 communication data ( + )
Note) SW1 for the terminating resistor on the RS485 Communications Card 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
Start-stop
Communication system
Half-duplex
Communication speed
(Baud rate)
19,200 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.
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