Texas Instruments COM320 User Manual

Operate to Test & Instruction Manual FCC ID: A92COM320

Excerpt from Word97 test report file “005-A92COM320.doc”, Attachment 2, pages 25 & 26

Attachment 2

Operate to Test

The Tag-it Commander is the reader in the system. It is designed to operate with loop antennas having
dimensions of 7.25” (L) x 3.5” (W) or less. Smaller dimension antennas may be employed in order to address
applications that have limited space and shorter read range requirements such as the installation of the Tag-it
reader in a printer that would also apply the transponder or read a transponder that had been applied to a page or
object that was to presented to the printer to receive an imprint. Such antennas could be fabricated on a printed
wiring board assembly rather than being a wire loop enclosed in a plastic case such as shown in page 2
(Word97 file: “a92SwRIpic.doc”). Smaller loop antennas would radiate a lower level RF field than would the
antenna shown in this application. In order to accommodate smaller antennas, TI requests that this modular
device be authorized with the following condition pertaining to the antenna:

This device is approved for use only with a loop antenna having dimensions that do not
exceed 7.25” (L) by 3.5” (W). Versions of this device that use larger antennas must be
approved as a Class II permissive change, if applicable, or under a new grant of equipment
authorization.

Any antenna connected to this device will need to be matched to the output of the reader. This will require that
the Tag-it reader be placed in continuous mode. Note that the adjustments set forth below are not adjustments
that are to be made by end users. Instead, they are to be made at the time that any alternative antenna is tested
and before the Tag-it reader is incorporated into another device. The following procedure should be used in
order to accomplish this adjustm ent.

Steps:

Note: The following adjustments should be undertaken only by a trained electronics
technician.

1. Connect the reader to a 12V /1A DC power source and the RS 232 interface cable to the interface board.

2. Run the Tag-it Navigator demonstration software on the host computer and check connection with

command : > Get Commander version <

3. Place transponder (tag) over the antenna

4. Click command >Get Block <, the tag will be recognized with 32 bit default block data column.

5. Click command > Continuous <

6. Click command > Repeat last <, the tag will be continued to be recognized until the tag is removed.

7. Maximum read distance occurs when antenna is fully tuned at 50

housing that covers the antenna matching network circuit should be removed and the three capacitors
located in board’s center should then be adjusted individually in sequence until achieving maximum
distance when the tag is parallel with the antenna. Jumpers (J1-J20) are preset and should not be moved.

Ω impedance and 13.56 MHz. The

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Operate to Test & Instruction Manual FCC ID: A92COM320

R*

J20
J19
J18
J17
J16

J15

J14
J13

A3

Short
2200
1500
680
470
220
100
47

C3 C2

All variable capacitors are5-90pF

* Value depends on antenna inductance

C19

A2

C1

C4

A1

C13

C5

47
100
220
470
680
1500
2200

47
100
220
470
680

J1

J2

J3
J4
J5

J6

J7

J8
J9
J10
J11
J12

Adjustable Antenna Matching Network
Component Placement

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