8 - 4 DS2278 Digital Scanner Product Reference Guide
Decoded Data Transmission
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.
ACK/NAK Enabled and Packeted Data
The scanner sends a DECODE_DATA message after a successful decode. The scanner waits for a programmable
timeout for a CMD_ACK response. If it does not receive the response, the scanner tries to send two more times
before issuing a host transmission error. If the scanner 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 if ACK/NAK handshaking is enabled, no handshaking occurs because handshaking applies only to packeted
data. In this example the packeted_decode parameter is disabled.
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.
Decoder
Data is captured
by decoder
Host
(1)
DECODE_DATA
(2)
CMD_ACK
message sent
Decoder
Data is captured
by decoder
Host
ASCII data
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