SSI Interface
247
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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