Hitachi L300P-110L Instruction Manual page 102

Connect each inverter in parallel as shown below. It is necessary to short terminals RP and SN on the last
inverter in the link (even if communication is to only one inverter the link should still be made).
By shorting between RP and SN, the terminal resistance is increased and controls the reflection of the
signal.
External
control
machines
(2) Setting
The following settings are required to operate RS485 communication.
Set item
Data command
Communicating transmission
speed
Communication code
Communication bit
Communication parity
Communication bit
Communication waiting time
SP SN RP SN
Function
Set value
code
02
03
C070
04
05
02
03
C071 04
05
06
C072 1 to32
7
C073
8
00
C074 01
02
1
C075
2
C078 0 to 1000
4-62
Chapter 4 Explanation of function
_ _ _
SP SN RP SN
Operator
RS485
Option 1
Option 2
Loop-back test
2400 bps
4800 bps
9600 bps
19200 bps
This assigns the station number of the inverter.
This is used when you control more than one
simultaneously.
7 bit
8 bit
No parity
Even parity
Odd parity
1 bit
2 bit
Units :ms
(3) Communication procedure reference
SP SN RP SN
Description