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Chapter 4
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
Transmission speed
Communication method
Synchronization method
Transmission code
Transmission method
Applicable interface
Data bit length
Parity
Stop bit length
Initiation method
Waiting time
Connection format
Error check
<Specifications and connections of RS485 ports>
For the RS485 communication function, use the TM2 terminal block on the control circuit terminal block board.
Use shielded and twisted pair cable (0.5mm
If a shielded and twisted pair cable is not available, followings are recommended as the wire.
Solid-core wire 0.14mm
2
Standard wire 0.14mm
Standard wire with bar terminal 0.25mm
Striped covering length 5mm
Screw torque 0.22Nm-0.25Nm(screw size M2)
ASCII mode
2,400, 4,800, 9,600, or 19,200 bps
Half-duplex communication
Start-stop transmission
ASCII code
Transmission beginning with the lowest-order bit
RS485
7 or 8 bits
No parity, even parity, or odd parity
1 or 2 bits
Initiation only by a command from the external control
system
10 to 1,000 ms
1-to-N connection (N: Maximum of 32 [inverters])
Overrun, framing, BCC,
vertical parity, and
longitudinal parity errors
Control circuit block
2
) to connect TM2.
2
2
-1.5mm
(when two wires are on one terminal pole,0.14 mm
2
-1.0mm
(when two wires are on one terminal pole,0.14 mm
2
-0.5mm
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
Modbus-RTU mode
Asynchronous
transmission
Binary code
8 bits
0 to 1,000 ms
Overrun, framing, CRC-16,
and longitudinal parity
errors
Abbreviated
name of
terminal
Control circuit
block board
2
4-113
Explanation of Functions
Related code
Remarks
Selection with the digital operator
Selection with the digital operator
Selection with the digital operator
Selection with the digital operator
Setting with the digital operator
Station number to be selected with
the digital operator
Description
Positive signal terminal for
SP
transmission
Negative signal terminal
SN
for transmission
Terminal to enable the
RP
terminating resistor
SN
Terminal to enable the
terminating resistor
2
2
-0.5mm
)
2
2
-0.2mm
)
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