Omron V670 Series, User Manual

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5-6 Communication Command
5-10
5-6-1 Read (RD)
Reads a data in a area specified by the first address and the number of bytes.
Example: Reading 8 bytes of data from the address 0000h
(Single trigger, hexadecimal code)
Sent data: RDSTH 1 0 0 0 0 0 8 * [CR]
Received data: RD 0 0 0 0 1 2 3 4 5 6 7 8 1 2 3 4 5 6 7 8 * [CR]
Communication designation Specifies how to communicate with a tag.
For details, refer to the communication designation list.
Data designation Specifies a type of transmitted code of read data at the response.
"A": ASCII code
"H": Hexadecimal code
Antenna designation Fixed to "1".
First address of read area Specifies the first address of area, where data is read from a tag, in four hexadecimal
digits.
Available designation range: 0000h to 007Fh.
Number of read bytes Specifies the number of bytes to be read in HEX code.
The number of bytes that can be read at a time is as follows:
-ASCII:256 bytes (256 characters)
-HEX:128 bytes (256 characters)
Available designation range: 01h to 80h.
Read data Data read from a tag. For the ASCII code, the number of characters is the number of read bytes.
For the hexadecimal code, the number of characters is the number of read bytes x 2.
Correct Usage
Specify the number of read bytes so that the sum of the number of read bytes and the first address of read area cannot
exceed the tag memory capacity (128 bytes).
Example: For the address 0010h, the range between 00h and 70h can be specified.
<Command>
Command
code
"RD"
Communication
designation
Data
desig-
nation Antenna
desig-
nation First address of read area Number of read
bytes
<Response>
Command
code
"RD"
Termination
code
"00"
Retrans-
mission
flag
Status
flag
Read data
Number of specified bytes