IFM DTI424, Operating Instructions Manual

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DTI424 DTI425
17
10 Operation
The device supports several operation modes selected with the command value in the process data
output image:
Operating mode Command value Description
Read UID 0x00 Operating mode Read UID ( Ò / 17)
Auto read data 0x01 Operating mode Auto read data
(
Ò /
18)
Auto write data 0x02 Operating mode Auto write data
(
Ò /
19)
Read data 0x03 Operating mode Read data ( Ò / 20)
Write data 0x04 Operating mode Write data (
Ò /
24)
For all operating modes, the same status bits and error values in the process images apply.
10.1 Deactivate internal antenna
The internal antenna of the unit can be deactivated at any time. With antenna deactivated
• the device can still be accessed via IO-Link,
• no high-frequency magnetic field is generated by the unit,
• the unit does not recognise ID tags.
Interference between units mounted next to each other is reduced by deactivating the antenna.
Deactivate the internal antenna:
u
Set the "Cmd Antenna deactivate" bit in the process data output.
The status of the internal antenna is queried via the bit “Antenna deactivated“ in the process
data input image.
10.2 Operating mode Read UID
In the operating mode "Read UID" the UID of an ID tag is read. Then the UID is available in the
process data input. If no ID tag is in the range of the device, the 8 bytes of the UID get the value
"0x00".
As soon as an ID tag is detected by the device, the UID is transferred. The transfer is continued for the
min. length of the data hold time. If a new ID tag appears in the detection range during the data hold
time, the UID of the new ID tag is transferred.
The default operating mode after the unit is started is "Read UID".
Byte Process data output Process data input
0 Command value = 0x00 Command value = 0x00
1 Status Status
2 ignored UID 0
3 ignored UID 1
4 ignored UID 2
5 ignored UID 3
6 ignored UID 4
7 ignored UID 5