User's Manual Part 1

13,56 MHz Multitag Reader Module, Version 0.9v
ACG Identification Technologies AT Page 25
5.3.6 Continuous Read
The reader device reads and displays the serial numbers continuously while one or
more tags remain in the field. This command stops if any character is sent to the
reader module. The reader module returns the character ‘S’ (53h).
Only different tag types are detected at the same time. Use the multitag list command
(see chapter 5.3.8) if more than one ISO15693 tag are present.
The reader supports different tag types. Though a single continuous read instruction
needs a specific time. To increase the reading performance switch to a single tag
mode. Results depend on the startup conditions. See chapter read EEPROM register
for more details of startup configurations.
5.3.6.1 Command
Command Data
‘c’ none
5.3.6.2 Answer
Answer Description
data Leading character (1 byte) + serial number (n bytes)
Number of bytes depends on tag type.
This command is not supported in binary protocol mode.
5.3.6.3 Leading character
The leading character specifies a single tag type. It can be used to determine the
present tag type and control tag specific commands. Card types have different UID
length, e.g. ISO15693 cards use an 8 byte UID whereas standard ISO14443 Type A
cards 4.
Following table describes all leading characters of supported tag types.
Tag type UID length Description
‘V’ 8 bytes ISO 15693
‘T’ 4 bytes Tagit®
‘I’ 8 bytes Icode®
‘M’ Var. size Mifare® Ultralight, ISO 14443 Type A
‘S’ 8 bytes SR176
‘Z’ 4 bytes ISO1443 Type B
Figure 5-12: Leading character of continuous read mode