Basic Instructions; Read - Siemens SIMATIC Ident Function Manual

4.5.2

Basic instructions

4.5.2.1

Read

The "Read" instruction reads the user data from the transponder and enters this in the
"IDENT_DATA" buffer. The physical address and the length of the data are transferred
using the "ADDR_TAG" and "LEN_DATA" parameters. With the RF600 readers, the
instruction reads the data from memory bank 3 (USER area). Specific access to a certain
transponder is made with the "EPCID_UID" and "LEN_ID".
Figure 4-5
Table 4- 14 Explanation for the instruction "Read"
Parameter
ADDR_TAG
LEN_DATA
LEN_ID
Ident profile, Add-on instruction for Rockwell systems
Function Manual, 07/2020, C79000-G8976-C410-04
Instruction "Read"
Data type
DINT
INT
SINT
Default values Description
0x00 Physical address on the transponder
where the read starts. You will find
more information on addressing in
the section "Transponder addressing
(Page 98)".
With MV: The length of the read
code is located starting at address
"0" (2 bytes). The read code is locat-
ed starting at address "2".
0x00 Length of the data to be read
Default value: 0x00 ≙ unspecified
0x00 Length of the EPC-ID/UID
single tag access (RF200, RF300,
RF61xR, RF68xR)
Configuring the instructions
4.5 Programming instructions
1)
33