Communications Range Diagram, Reception Level Diagram (Reference Only - Omron V780-Series User Manual

Appendices
A-4 Communications Range Diagram,
Reception Level Diagram (Reference
Only)
Communications range
The communications range differs depending on the radio regulations of each country. Moreover, the
communications range may change under the influence of the ambient environment, type of RF Tags,
and the items on which RF Tags are mounted. Sufficiently verify the communications range in advance.
Additional Information
The diagram shows characteristics when the mounting material is a 400 × 300 × 1 mm alumi-
num plate. The directional characteristics of the RF Tag will change with the size of the metal
surface.
Reception level
You can obtain the reception level from an RF Tag. The unit is dBm and values are given in 1-dB increments.
The reception level will vary with the ambient environment, type of RF Tag, and the items on which RF
Tags are mounted. Sufficiently verify the communications field in advance.
Note 1. The reception level will attenuate by approx. 6 dBm when the distance between the Reader/Writer and
RF Tag is doubled.
2. The obtained values were input at the edge of the Reader/Writer antenna. They are not the levels
received by the antenna.
Precautions for Correct Use
The obtained values may be different in any specific application. The values obtained with RSSI also
vary with the RF Tags that are used, the orientation of the RF Tags, and the ambient environment.
Therefore, the reception levels in the above graphs are strictly for reference only. Use these value
only as reference to confirm leeway in the RF Tag communications levels in the actual environment.
Measurement Conditions
Communications Range Measurement Conditions
Measurement environment
RF Tag
Transmission power
Communications command
*1. The RF Tag was mounted to a V780-A-TA-133-10 Attachment.
Reception Level Measurement Conditions
Measurement environment
RF Tag
Transmission power
Communications command
A - 8
Radio wave darkroom
V780-A-JIME-Z3BLI-10 (made by Toppan Forms Co., Ltd.)
27 dBm
DATA READ and DATA WRITE
Radio wave darkroom
V780-A-JIME-Z3BLI-10 (made by Toppan Forms Co., Ltd.)
27 dBm
ID READ
UHF RFID System V780-series Reader/Writer User's Manual (EtherNet/IP
*1
TM
) (Z402)