Hitachi SJ700-2 400 bps, 800 bps, 600 bps, 19,200 bps, Assignment of a station number to, Bits

Chapter 4 Explanation of Functions

Connection

As illustrated below, connect the inverters in parallel to the external control system, and connect the RP and SN terminals with a jumper on the inverter at the end of the network. (Similarly jumper the RP and SN terminals when only one inverter is connected to the external control system for RS485 communication.) Connecting the RP and SN terminals enables the terminating resistor in the control circuit terminal block board of the inverter, which suppresses signal reflections.

External control

system

		…
SP SN RP SN	SP SN RP SN	SP SN RP SN

(2) Required settings

The following table lists the inverter settings required for the RS485 communication:

Item	Function code	Data or range of data	Description
		02	Loopback test
Communication speed	C071	03	2,400 bps
		04	4,800 bps
selection
		05	9,600 bps
		06	19,200 bps
			Assignment of a station number to the
			inverter
Node allocation	C072	1. to 32.	(Set this item when your inverter is
			connected together with other(s) to a
			control system.)
Communication data length	C073	7	7 bits
selection		8	8 bits
Communication parity	C074	00	No parity
		01	Even parity
selection
		02	Odd parity
Communication stop bit	C075	1	1 bit
selection		2	2 bits
		00	Tripping
		01	Tripping after decelerating and stopping
Selection of operation after	C076		the motor
communication error		02	Ignoring the errors
		03	Stopping the motor after free-running
		04	Decelerating and stopping the motor
Communication trip limit time	C077	0.00 to 99.99 (s)	Limit length of time to determine
setting			communication train disconnection
Communication wait time	C078	0. to 1000. (ms)	Time to wait until the inverter returns a
			response
Communication mode	C079	00	ASCII mode
selection		01	Modbus-RTU mode

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