Siemens SIMATIC MV440 - Page 257

Process interfacing via an automation system (PLC, PC)
10.3 Control with FB 45 and Ident profile
SIMATIC MV420 / SIMATIC MV440
Operating Instructions, 04/2013, A5E02371045-06
255
Command: Reset DISA bit
The command data to be "written" in the WRITE command simply contains the command
identifier "Reset DISA bit".
If the DISA bit of the reader is reset, the command is acknowledged positively. If it was
already reset, this command has no effect but is nevertheless positively acknowledged.
The WRITE command must specify a length of 0x1 ("MOBY_CMD".length or
"PIB_COMMAND".Length = 0x1), otherwise a negative response will be sent.
Table 10- 22 Moby_CMD
Command
[hex]
Sub_
Command
[hex]
Length
[dez]
Address_
MDS [hex]
DAT_DB_number
[dez]
DAT_DB_address
[dez]
Number of the
data DB (for example
48)
Pointer to the start
word
(for example 0)
01 - 1 0
Pointer to the user data to be sent to the
reader.
Table 10- 23 PIB_COMMAND
Parameter Value
CMD 0x71
OffsetBuffer 0x00
UID 0x00
Length 0x01
StartAddress 0x00
Table 10- 24 Command data area (FB45: Data DB, RFID standard profile: TXBUF or RXBUF)
Address Value Meaning
0x0000 0x06 Command identifier
"Reset DISA bit".