Appendix 1 Glossary - Omron V690 Series User Manual

Appendix 1 Glossary

Response
In this manual, this refers to a response returned by the Read/Write antenna after a host device issued an instruction to the Read/Write
antenna.
RFID
Radio Frequency Identification, i.e., automatic identification with radio system. Data about object is stored in the ID tag memory
and the data is read/written by a reader/writer without contacting.
RS-232C
Common physical interface standard of EIA (Electronics Industries Association). Communication speed 9600 bps can be achieved
in communication range 15 m.
RS-422A
Common physical interface standard of EIA (Electronics Industries Association). RS-422A is more excellent in noise resistance
than RS-232C and a maximum of 3000 m of communication range is available. Communication is performed through four wires.
Two wires are for sending and the others are for receiving.
RS-485
Common physical interface standard of EIA (Electronics Industries Association). The same line is used for both of sending and
receiving. So, communications can be made through two wires.
Second-generation low-power data communication system
Remarkably applicable wireless LAN which was legislated in 1999. A wide range of frequency band 2400 to 2483.5 MHz can be
used by the SS (Spread Spectrum) system and multiple channels are available. ARIB RCR STD-33 (1999) is the Standard.
Sleep, sleep state
The state that any communication to the Read/Write antenna is not performed. In this state, battery power is used only to back up
data in SRAM and the power consumption is 1/100 or less of the state that the ID tag operates or communicates. Therefore, to
extend the life of the battery of ID tag, we recommend you to put the ID tag in the sleep state whenever the ID tag does not work.
When the ID tag receives a radio wave from the Read/Write antenna, the ID tag quits the sleep state and works.
Specified low-power radio station
A radio station that the antenna power is 10 mW or less. A user is not required to apply a license for radio station. This product is
verified by Technical Regulation Conformity Certification of an official organization before shipment.
SRAM
Static RAM (Random Access Memory). Volatile memory. Data is backed up by battery.
Standby, standby state
The state that all the circuits in a tag are ready to operate after a command is executed. The battery power consumption is the same
as that at an operation such as communication. As a period of the standby state becomes short, the life of the battery can be extended.
Start-stop synchronization
Asynchronous data communication system which does not use synchronizing clock. Communication line is only one. Use it when
synchronizing clock cannot be sent.
Tag
In this manual, this refers to ID tag which is memory media accessed by the Read/Write antenna of the RFID system. As accurate
technical term, this is referred to as "Transponder". We call it "Tag" because "Transponder" is hard to say.
Terminating resistance
Put at both ends of communication line to prevent reflection in the communication line in RS-422A/RS-485.
Time slot
One of the systems that the Read/Write antenna accesses several ID tags. This system adopts the time slot. For example, if "M" (the
number of time slots = 16) is specified in the data exchange designation of a command, the antenna informs the ID tag that there are
16 time slots and every ID tag returns a response according to timing of any of 16 time slots. If responses of several ID tags collide
with each other, the time slots for those tags are rearranged. For "M", if the number of tags are approximately 8, probability of rear-
rangement is reduced and the total data exchange time is not prolonged so much.
Appendix-2