Hitachi SJ700-2 instruction manual Communication Functions, Communication specifications

Chapter 4 Explanation of Functions

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.

Related code

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

(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
	Overrun, framing, BCC,	Overrun, framing,
Error check	vertical parity, and	CRC-16, and
	longitudinal parity errors	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	Description
Control circuit block	terminal
	SP	Positive signal terminal
		for transmission
	SN	Negative signal terminal
		for transmission
	RP	Terminal to enable the
		terminating resistor
Control circuit	SN	Terminal to enable the
		terminating resistor
block board

4 - 113