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

14. COMMUNICATION FUNCTIONS

14.9 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.

14.10 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

	Axis No.		Command Data No.
Start
	Data	[0]		STX	0 2
Data make-up
		[0][0][5] STX			[0][2] ETX
Checksum calculation and	Checksum 30H 30H 35H 02H 30H 32H 03H						FCH
addition
	Transmission data					STX 0 2	F C 46H 43H
Addition of SOH to make
up transmission data						Master station	slave station

		Data transmission
		Data receive
		Is there receive data?			No
			Yes	300ms elapsed?		No
					Yes
			3 consecutive times?			No
	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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