Hitachi SJ700D-004L, Instruction Manual

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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, L300P and SJ700 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
Use shielded and twisted pair cable (0.5mm
2
) to connect TM2.
If a shielded and twisted pair cable is not available, followings are recommended as the wire.
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