Mitsubishi Electronics MR-J2S- CL Initialization, Communication procedure example, Stx Etx, Fch

15. COMMUNICATION FUNCTIONS

15.9 Initialization

After the slave station is switched on, it cannot reply to communication until the internal initialization processing terminates. Hence, at power-on, ordinary communication should be started after:

(1)1s or more time has elapsed after the slave station is switched on; and

(2)Making sure that normal communication can be made by reading the parameter or other data which does not pose any safety problems.

15.10 Communication procedure example

The following example reads the set value of parameter No.2 "function selection 1" from the servo amplifier of station 0:

Data item	Value		Description
Station number	0	Servo amplifier station 0
Command	05	Read command
Data No.	02	Parameter No.2
		Start		Axis No.		Command			Data No.
				Data	[0]		STX	0 2	ETX
	Data make-up
					[0][0][5] STX			[0][2]
	Checksum calculation and			Checksum 30H 30H 35H 02H 30H 32H 03H							FCH
	addition
	Addition of			Transmission data				SOH	0	STX 0 2	ETX F C 46H 43H
			SOH to make
	up transmission data									Master station	slave station

	Data transmission
	Data receive
	Is there receive data?		No
	Yes	300ms elapsed?		No
			Yes	No
	3 consecutive times?
Yes	Other than error code		Yes
			100ms after EOT transmission
No	[A] [a]?
3 consecutive times?
	No		Error processing
Yes
	Receive data analysis

Error processing

End

Master station slave station

Master station slave station

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