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Datalogic PowerScan PM8500 Manual

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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
… 173 …


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