Customer manual
LFM 4x Reader
RFID
WE GENERATE SOLUTIONS
HERMOS AG
Gartenstraße 19 • 95490 Mistelgau
Phone: +49 9279 991 - 0
LFM 4x Reader Rev1.4
16
6. Functional description
6.1 General information
LF reading devices are radio frequency identification systems that use radio transmission to read
or write data of LF transponders (134,2 kHz), which operate as tamper-proof electronic tags. The
LF reading devices communicate with common transponders (134,2kHz) according to ISO 18000-2
and ISO 11785 that are available on the market.
The data is transmitted via the existing interface with the preset transmission parameters. If seve-
ral interfaces are available and connected to the host, the transmission is always carried out on the
most recently used interface. The data is embedded in a defined communication protocol and
exchanged between the reader and host.
6.2 Basic functions - operating modes
During normal operation, the LF reading device supports various basic functions:
•
Heartbeat function, software version query
•
Scanning of transponders in the antenna area (UID)
•
Reading data
•
Writing data
•
Locking data
•
Setting and reading out parameters
•
Setting and querying inputs and outputs
The LF devices can be set in 3 other operating modes by setting the parameters: Polling operation
(optional), sensor-triggered automatic reading and test mode.
6.2.1 Normal operation
During normal operation, the LF reading device is immediately ready for operation after a reset. It
does not perform any automatic actions in this mode (standby). During normal operation, actions are
triggered by protocol commands from the host.
A scanning procedure or reading in the data area is initiated by a command of the host system
using the communication protocol.¬
In addition to the actions triggered by the host, a corresponding message can be automatically sent
to the host and an automatic reading operation can be started by activating or releasing a sensor.
When the reading operation is successful, the read data is immediately transmitted to the host. If
several antenna ports are occupied simultaneously, the reading operations are processed sequen-
tially.
Writing actions (data saved to a transponder) are generally only possible via commands from the
host.
6.2.2 Polling mode
LF reading devices can be set into a continuous reading state, which is referred to as
polling mode. The device then performs reading operations at regular intervals and
outputs the corresponding data of the read LF transponder.
The reading device also continues carrying out protocol messages in polling mode. This
may, however, result in delays in the poll rhythm. The polling functionality is optional
customer-specific available!
6.2.4 Test module
