Omron J7 series, User Manual

Page: 115 / 177

101
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
4
5 Number of registers of read data (max. 16)
6
7 CRC-16 check
8