Hitachi SJ700-4000HFU2

Chapter 4 Explanation of Functions
4-113
4.4 Communication Functions
The inverter can engage in RS485 communications with an external
control system that is connected to the TM2 terminal block (on the
control circuit terminal block board) of the inverter.
The SJ700 series inverter shares the ASCII communication protocol
with the SJ300 and L300P series inverters.
(1) Communication specifications
Item
ASCII mode
Modbus-RTU mode
Remarks
Transmission speed
2,400, 4,800, 9,600, or 19,200 bps
Selection with the digital operator
Communication method
Half-duplex communication
Synchronization method
Start-stop transmission
Asynchronous
transmission
Transmission code
ASCII code
Binary code
Transmission method
Transmission beginning with the lowest-order bit
Applicable interface
RS485
Data bit length
7 or 8 bits
8 bits
Selection with the digital operator
Parity
No parity, even parity, or odd parity
Selection with the digital operator
Stop bit length
1 or 2 bits
Selection with the digital operator
Initiation method
Initiation only by a command from the external control
system
Waiting time
10 to 1,000 ms
0 to 1,000 ms
Setting with the digital operator
Connection format
1-to-N connection (N: Maximum of 32 [inverters])
Station number to be selected with
the digital operator
Error check
Overrun, framing, BCC,
vertical parity, and
longitudinal parity errors
Overrun, framing, CRC-16,
and longitudinal parity
errors
<Specifications and connections of RS485 ports>
For the RS485 communication function, use the TM2 terminal block on the control circuit terminal block board.
Abbreviated
name of
terminal
Description
SP
Positive signal terminal for
transmission
SN
Negative signal terminal
for transmission
RP
Terminal to enable the
terminating resistor
SN
Terminal to enable the
terminating resistor
Followings are recommended as the wire to connect TM2.
Solid-core wire 0.14mm
2
-1.5mm
2
(when two wires are on one terminal pole,0.14 mm
2
-0.5mm
2
)
Standard wire 0.14mm
2
-1.0mm
2
(when two wires are on one terminal pole,0.14 mm
2
-0.2mm
2
)
Standard wire with bar terminal 0.25mm
2
-0.5mm
2
Striped covering length 5mm
Screw torque 0.22Nm-0.25Nm(screw size M2)
A001: Frequency source setting
A002: Run command source setting
C071: Communication speed selection
C072: Node allocation
C073: Communication data length selection
C074: Communication parity selection
C075: Communication stop bit selection
C078: Communication wait time
C079: Communication mode selection
Related code
Control circuit block
Control circuit
block board