Worth Data 520-RF Operations Instructions download pdf (Page 31)

2-Way Laser Operating Instructions

Operational Details

The two-way LZ202-RF Laser Scanner and LI102-RF Linear Imager CCD:

1. chirps on a "good read" or successful scan while turning off the scanner

beam, and

2. beeps loudly when it gets the acknowledgement back from the Base

Station that it has received the data.

The yellow light on the back of the scanner indicates that it is transmitting.

You will see up to four transmission attempts before the unit goes to sleep and

waits for you to pull the trigger again. The green light indicates that it has

received the acknowledgement from the Base Station. After four unsuccessful

tries of transmitting to the base without an acknowledgement, the scanner

chirps 8 times and goes to sleep waiting on the operator to move closer to the

base station and pull the trigger again for a transmission retry. After going to

sleep on an unsuccessful read, when the trigger is pulled again, the scanner

beam doesn't turn on for reading; instead, the unit beeps three times to indicate

is re-transmitting and just transmits again. This sleep and retransmission cycle

is repeated until the acknowledgement is received or the buffer is deliberately

cleared. In this way, no scanned data is lost, even though you have wandered

out of range of the Base Station. Until the pending data acknowledgment has

been received, pulling the trigger will only retransmit and not activate the

scanning laser beam for additional reading.

If you are out of range and want to clear data in the scanner's buffer waiting to

be transmitted again, by pulling the trigger and holding it down for 15 seconds,

the buffer will be cleared and the scanner will emit 3 low pitched beeps.

Multiple Scanners on one 2- Way Base Station

Multiple 2-way scanners can talk to one base station on the same frequency by

scanning a unique ID Character in each scanner. Just scan Start Setup, Set ID

Character, and the 1-8 followed by End Setup for each scanner, (using a

different value 1-8 for each scanner). Remember though, the scanning

throughput is dependent on the total volume of scanning from all scanners

assigned to the same frequency sharing a base station. If two scanners transmit

at the same time, the base station will receive neither of the messages and both

scanners will wait for a random time and retransmit. The random wait before

retransmission assures maximum probability of both getting through. If there

are too many collisions in radio transmission, the scanning rate will be slow.

The fix is to buy more base stations of a different frequency and get a portion

of the scanners changed to the frequency of the additional base station.

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Worth Data 520-RF Operations Instructions Page 31