YASKAWA VS MINI J7 User Manual download pdf (Page 115)

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DSR Message and Response Chapter 7-4

7-4 DSR Message and Response

The following description provides information on how to set DSR messages

and what details are returned as responses. Each DSR message or response

is divided into 8-bit blocks. Therefore, data must be set in 8-bit blocks for

communications.

7-4-1 Data Read (Function Code: 03 Hex)

Settings and Responses

• To read data (such as control I/O status data, monitor item data, or

parameter set value data) from the Inverter, issue the following DSR

message.

• Data read is a maximum of 16 words in length (i.e., data of 32 bytes from

16 registers) per DSR message.

• A register number is allocated to each function item, such as control I/O,

monitor item, and parameter functions. The register number of each

parameter is indicated wherever the parameter is explained in this manual

and in Section 10 List of Parameters. For register numbers other than

those of parameters, refer to 7-7 Register Number Allocations in Detail.

Note 1. A parameter corresponds to one register (one word), so the “number of

registers of read data” indicates the number of parameters to be read (i.e.,

the number of consecutive registers beginning with the first register

number).

1. The “number of bytes of attached data” indicates the number of bytes of

data read from the registers attached from that point onwards. The number

of registers must equal the number of bytes divided by two.

DSR Message

Byte No. Data

1 Slave address

2 Function code (03 Hex)

3 Register No. of read start data

5 Number of registers of read data (max. 16)

7 CRC-16 check

1 2 ... 110 111 112 113 114 115 116 117 118 119 120 ... 176 177

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YASKAWA VS MINI J7 User Manual Page 115