Mitsubishi FR - S500 instruction manual 124, Instruction Data, H7F, Hff

7)Sum check code

The sum check code is 2-digit ASCII (hexadecimal) representing the lower 1 byte (8 bits) of the sum (binary) derived from the checked ASCII data.

(Example 1) Computer Inverter

ASCII code

(Example 2)

Inverter Computer

ASCII code

E

Station

number

Instruction

code

Waiting

Sum

time

N

Data

check

Q

code

0

1

E

1

1

0

7

A

D

F 4

Binary code

H05

H30 H31

H45 H31

H31

H30 H37 H41 H44

H46 H34

H

H

H

H

H

H

H

H

H

30+31+45+31+31+30+37+41+44

H

=1F4

Sum

S

Station

number

Read time

E

Sum

X

X

code

T

T

check

0

1

1

7

7

0

3

0

Binary code

H02

H30 H31

H31 H37 H37 H30

H03

H33 H30

H H H H H H 30+31+31+37+37+30

H

=130 Sum

8)Error code

If any error is found in the data received by the inverter, its definition is sent back to the computer together with the NAK code. (Refer to page 128.)

REMARKS

1.When the data from the computer has an error, the inverter will not accept that data.

2.Any data communication, e.g. run command, monitoring, is started when the computer gives a communication request. Without the computer's command, the inverter does not return any data. For monitoring, therefore, design the program to cause the computer to provide a data read request as required.

3.When accessing the parameter settings, data for link parameter expansion setting differs between the parameters as indicated below:

		Instruction	Data
		Code
			H00: Pr. 0 to Pr. 99 can be accessed.
Link	Read	H7F	H01: Calibration parameters C1 to C7 (Pr. 900 to
			Pr. 905) and communication parameter n13
parameter			(Pr. 145) can be accessed.
expansion			H03: Communication parameters n1 to n12
setting	Write	HFF	(Pr. 331 to Pr. 342) can be accessed.
			H09: Communication parameters n14 to n17
			(Pr. 990 to Pr. 993) can be accessed.

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