IFM DTI420 Operating Instructions Manual page 21

Rf-identification system

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u Use the control to set the following values in the process data output: the command value "0x03",

the address (16 bits) and the data length (16 bits).

u With the control, start the read operation with the status bit "Cmd Start".

w The device acknowledges the start of the read operation by setting the status bit "Cmd Start

Acknowledge" in the process data input.

w The device transfers the data in the process data input (data 0 to 27) and increases the block

counter by 1 as soon as the first data of the ID tag is available. The block counter is reset to "0"

when the value exceeds "255".

u With the control, acknowledge the receipt of the data by increasing the block counter in the process

data output by "1".

u The last two steps are repeated until all data has been transferred.

w The device sets the status bit "Cmd End" with the last transfer.

The read operation is terminated.

If reading was unsuccessful, the device sets the error value and the status bit "Cmd End" in the

process image. The data transmission is interrupted.

Byte

Process data output

Command value = 0x03

Status

ignored

Address (high byte)

Address (low byte)

Length (high byte)

Length (low byte)

ignored

DTI420 DTI421

Process data input

Command value = 0x03

Status

Data 0

Data 1

Data 2

Data 3

Data 4

Data 5

Data 6

Data 7

Data 8

Data 9

Data 10

Data 11

Data 12

Data 13

Data 14

Data 15

Data 16

Data 17

Data 18

Data 19

Data 20

Data 21

Data 22

Data 23

Data 24

Data 25

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IFM DTI420 Operating Instructions Manual page 21

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