Allflex AFX-100 Manual do Utilizador descarregar pdf (Página 30)

Rev Australasia V2.3 12/04

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Assuming that the reader has been successfully installed and commissioned, generally,

reliability issues with any sort of RFID reader will fall into 2 categories. (a) Poor read / No

read and (b) No Communications. Please see following a flow chart that will assist in

diagnosing faults.

(a) Poor Read / No Read. If the panel reader has been in use and working previously and

then unexpectedly starts performing in a less than satisfactory manner, the likely

causes are

(1) Power Supply Problems

(2) New Equipment interference.

Firstly, test the power supply (battery etc). As an automotive battery loses charge

from close to 14 volts, the antenna performance will remain reasonably constant but

fall away badly at about 7 or 8 volts. So the first point to look at relating to reader

performance should always be power first. If you have tested the battery and know

that it is well charged then look at issues such as;

• Has any new electronic equipment been added close by or connected to the reader?

Such as a power supplies for radios, new scale heads, computers, computer

monitors etc? If so – switch them off and retest performance.

• Is there a problem with your AC power? In some cases it is possible for the earth

voltage (which should be zero) to actually float. When you plug in a computer, or

scale head to a panel reader, the high earth voltage is transferred to the

microprocessor in the reader. This causes the reader electronics to lock up.

(b) No Communications. This would mean that the reader can actually be seen to read a

tag, in that the reader beeps, the lights flash etc, but the electronic number is not

appearing on the scale display, or computer screen.

Communications is the process of transferring the RFID device number (and other

data) between the reader and the scale head, or computer. You may hear terms like

“Serial Communications” or “Comms” or “Serial Data”. All these terms refer to the

data being linked from the reader to the attached technology (Scale head, computer

etc).

It is very uncommon for the serial communications ports to stop working on, either the

reader, scale head or computer. The most common issues that prevent data from being

transferred will be

(1) Broken cable that joins the reader to the scale / computer etc.

(2) Incorrect port / communication settings. These settings can sometimes be

altered in both, the reader, scales or computers. The settings include issues

like, baud rate, parity, flow control etc.

Baud rate is the speed at which the “bits” of data are sent down the wires. If

baud rate and most of the other setting are not matched at both ends (reader

and scale /computer) the data will not be sent.

The standard settings for the Allflex Panel Reader is 9600 baud rate, 8 Data

Bits, No Parity, 1 Stop Bit and No Flow Control. These settings can be

program described earlier.

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