8

Electromagnetic Inductive RFID System

V700

Functions

■ Transmission Functions

Note: The V700-CD

@D-V@ and V700-HMD11(-1) have different

command structures.

■ Transmission Time (Reference)

The transmission time is the time required for transmission between the Antenna and ID Tag and does not include time required for host commu-

nications.

V700-CD

@D-V@

V700-HMD11/HMD11-1

Note: T = Transmission time (ms)

N = Number of pages (1 page = 8 bytes)

Multiple Access with the V700-CD

@D-V@

The transmission time when using multiple-access commands not

only depends on the number of bytes, but also on the number of ID

Tags in the transmission range and the combination of the ID Tags’

codes. The average values for random ID codes are given below.

(units: ms)

■ Mutual Interference Prevention Functions (Using the V700-CD@D-V@)

If there is less than 15 m between Antennas, all the Antennas must be synchronized to prevent mutual interference. This can be done using either

of the two methods described below.

Read-only Synchronization

If all the Antennas only use read commands, this method can be

used to reduce the access time.

Read/Write Synchronization

This is the synchronization method that is usually used. It enables

the synchronization of both read and write commands for several

connected Antennas.

V700-CD1D-V3

V700-CD2D-V3

V700-HMD11

V700-HMD11-1

Single access

Provided

Provided

FIFO

Provided

Provided

Multiple access

Provided

Not provided

Selective access

Provided

Not provided

Asynchronous

Write

T = 52.8 N + 113.5

Read

T = 46.7 N + 60.7

Read-only

synchronization

Read

T = 46.7 N + 107.4

Read-write

synchronization

Write

T = 52.8 N + 172.4

Read

T = 52.8 N + 119.6

Read

T = 48 N + 66

Write

T = 55 N + 120

Precautions on Using the Product near Noise Sources

This product makes transmissions to ID Tags using a fre-

quency of 125 kHz. Transceivers, motors, monitoring devic-

es,

and

power

supplies

have

parts

that

generate

electromagnetic waves (noise). These waves may interfere

with transmissions to ID Tags. Before using this product near

these kinds of devices, check that there is no adverse affect

on transmissions.

Number of Tags

Reading 8 bytes

Writing 8 bytes

5

579

873

10

1,191

1,547

15

1,857

2,275

20

2,523

3,002

30

3,853

4,455

50

6,344

7,192

1 m min.

1 m min.

1 m min.

1 m min.

1 m min.

1 m min.

1 m min.

1 m min.

Read

Read

Read

Read

Read

Read

Read

Write

Read/Write

Read