HID Global Corporation 5553 Manuale Utente

1508-USM-00-0-04

HF Multi ISO RFID Reader User Manual, Firmware V1.4

2.3.1.10 Multi-Tag Selection / List

This command detects several tags at the same time. It replaces the fast select command ('s') in
multiple tag surroundings. The Multi-Tag List command lists all tags with their serial numbers. Use
the Multi-Tag Select command to select a single tag. Each tag has to be selected separately.

Command

Data

'm'

Serial number (n bytes)
<CR> (1 byte)

Answer

Description

Data serial

number

'N'

Error: No Tag in the field [addressed tag not present or not responding]

Example

Command

Description

m<CR> 04E9E700000000

 first card

34030F07

 second card

 number of detected tags

m04E9E700000000<CR>

Select card with its serial number

2.3.1.10.1 Multi-tag list

Sending a <CR> as the first parameter, the reader returns a list of all tags present in the antenna
field. In the end the total number of tags detected is returned.

2.3.1.10.2 Reading distance

Each card needs a specific amount of power. The reader always provides the same power level.
Therefore, the reading distance will decrease if more tags are present. Basically, the reading
distance depends on the tag, the antenna and the tuning of the antenna.

2.3.1.10.3 Multi-tag select

Using the serial number with <CR> as parameter, the corresponding tag will be selected. High-
level interactions can be performed addressing only this card. All other tags remain silent.

2.3.1.10.4 Multi-tag reset

The antenna field reset can be deactivated with the Protocol configuration 2 register.

By suppressing the antenna field reset, it is possible to detect only new tags in the antenna field.

CAUTION: Possibly, ISO 15693 tags are interfered from ISO14443 type B and SR 176 tags.
In this case, the ISO 15693 tag always answers on a multi list command even if there was
no previous field reset. In this case, deactivate ISO 14443 B and SR 176 tags.

Page 50 of 144

August 2010