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Symbol PL4507 Decoder Integration Guide
Transfer of Decode Data
The Decode Data Packet Format parameter controls how decode data is sent to the host. Set this parameter to
send the data in a DECODE_DATA packet. Clear this parameter to transmit the data as raw ASCII data.
NOTE When transmitting decode data as raw ASCII data, ACK/NAK handshaking does not apply regardless of
the state of the ACK/NAK handshaking parameter.
ACK/NAK Enabled and Packeted Data
The decoder sends a DECODE_DATA message after a successful decode. The decoder waits for a programmable
time-out for a CMD_ACK response. If it does not receive the response, the decoder tries to send two more times
before issuing a host transmission error. If the decoder receives a CMD_NAK from the host, it may attempt a retry
depending on the cause field of the CMD_NAK message.
ACK/NAK Enabled and Unpacketed ASCII Data
Even though the ACK/NAK handshaking is enabled, no handshaking occurs because the handshaking applies only
to packeted data. In this example the packeted_decode parameter is disabled.
DECODE_DATA
Decoder
Data is captured
by decoder
CMD_ACK
message sent
Decoder
ASCII data
Data is captured
by decoder
(1)
Host
(2)
Host
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