Bedienungsanleitung Datalogic PowerScan PM8500 (Seite 173 von 232) (Englisch)

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Radio Parameters

Product Reference Guide 165

Transmission Mode

This parameter determines whether the reader receives responses or messages from the Host

or not. In One-Way tx mode, neither Host nor cradle responds to the reader. In Two-Way

tx mode, the reader

must receive a response from either the cradle or the Host.

The cradle responds (empty message) to the reader, only after good transmission to the

Host, f

or the following conditions: ACK/NACK enabled (page 150); WEDGE or PEN

interface. For these conditions, it is suggested to prolong the Radio

Protocol Timeout

(page 164).

Enabling Two-Way tx mode temporarily disables

FIFO buffering (see page 150).

With ACK/NACK disabled, the Host responds to the reader (through the cradle) with an

answer message (messa

ge to reader display or command to reader), see "Messages from Host

to Reader" on page 169, and the following figure.

Figure 28. Transmission Mode = Two Ways

Beeper Control for Radio Response

For M8500 series readers, the data entry good read tone normally results in two beeps; the

first indicates that the reader has decoded the code; the second indicates whether BC-80X0

has received the data.

This can be changed according to the following selections:

• Normal: both good decode and good re

ceptions are signaled (two beeps).

• Only Good Decode: only the first beep indicating a good read is signaled.

• Only Good Reception: only the second beep indicating a good reception is signaled.

• Off: Neither good read nor good re

ception beeps are signaled.

For all configurations, any transmission erro

rs will always be signaled.

Single Store

When single store mode is enabled, if the PowerScan™ M8500 fails to transmit a code to

the cradle, it enters a special operating mode that prevents the user from reading barcodes.

When such operating mode is entered, the trigger no longer enables barcode reading but is

used to retry transmission itself for the number of attempts selected in configuration. Once

the transmission is successful the reader returns to the standard mode. If transmission is not

successful after the number of configured attempts, the code is discarded.

Single store may be useful if you often read codes

at the limit of the coverage area and there

is a chance that code transmission can fail. In such case single store allows you to move to a

more favorable position or location (i.e. closer to the cradle) and retry transmission without

the necessity of re-reading the code since it is already stored in the reader.

Conversely, if single store is disabled, and the user wants to retry transmission, the

code

must be read again, and therefore the attempt must be made from basically the same

location. If the user gives up, he does not know if the transaction was successful. (Actually

the transmission could have been successful but the cradle may have been unable to

acknowledge the message). There are applications in which there is no risk of transmission

failure. In such cases it may be better to disable single store so that the user perceives a more

consistent behavior of the trigger in that it always corresponds to code reading.

BC-80X0

Host

data

cable

PowerScan

M8500

data

Transmission Mode = Two-Ways

Host answer message Host answer

message

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