Siemens SIMATIC MV500 Operating Instructions Manual page 167

Table 9- 28
Address
0x0000
Command: Read match string
To have the current match string returned when the "READ" command is received, the MV
command "Read match string" ("PHYSICAL WRITE" command) must be sent immediately
before. You can find more information on this subject in the section ""PHYSICAL WRITE"
commands / MV command interface (Page 158)".
After processing of the "PHYSICAL READ" command, the following data is available in the
memory area of the receive data:
If the length of the data to be read ("CMD_STRUCT.LEN_DATA") is not n + 2 bytes (n = total
length of the match string), the match string is truncated or the command data area is
padded with "0x00".
Table 9- 29
Parameter
CMD
OFFSETBUFFER
EPCID_UID
LEN_DATA
ADDR_TAG
Table 9- 30
Address
0x0000
0x0001
0x0002
...
n + 2
SIMATIC MV500
Operating Instructions, 03/2021, C79000-G8976-C494-05
Command data area (TXREF or RXREF)
Value
0x00 ... 0x0F
CMD_STRUCT
Value
0x70
0x00
0x00
≥ total length of the match string + 2
0x00
Memory area of the receive data (TXREF or RXREF)
Value
0x00 ... 0x0F
0x00 ... 0x0F
--
--
--
Process interfacing via an automation system (PLC, PC)
Meaning
Current program number
Meaning
Length of the total match string
(more significant byte)
Length of the total match string
(less significant byte)
1st character of the match string
...
nth Characters of the match string
9.3 Control with Ident profile
167