8 - 14 PL3307 Decoder Integration Guide
Software Handshaking
This parameter offers control of data transmission in addition to, or instead of, the control hardware
handshaking offers. There are five options.
If software handshaking and hardware handshaking are both enabled, Hardware Handshaking takes
precedence.
•
None
: Data transmits immediately. No response is expected from host.
•
ACK/NAK
: After transmitting data, the decoder expects either an ACK or NAK response from the host.
When the decoder receives a NAK, it transmits the same data again and waits for either an ACK or NAK.
After three unsuccessful attempts to send data when NAKs are received, the decoder issues an error
indication and discards the data.
The decoder waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK. If
the decoder does not receive a response in this time, it issues an error indication and discards the data.
There are no retries when a time-out occurs.
•
ENQ
: The decoder waits for an ENQ character from the host before transmitting data. If the decoder
does not receive an ENQ within the Host Serial Response Time-out, it issues an error indication and
discards the data. The host must transmit an ENQ character at least every Host Serial Response
Time-out to prevent transmission errors.
•
ACK/NAK with ENQ
: This combines the two previous options. For re-transmissions of data due to a
NAK from the host, an additional ENQ is not required.
•
XON/XOFF
: An XOFF character turns the decoder transmission off until the decoder receives an XON
character. There are two situations for XON/XOFF:
•
The decoder receives an XOFF before it has data to send. When the decoder has data to send, it
waits up to the Host Serial Response Time-out for an XON character before transmission. If it does
not receive an XON within this time, the decoder issues an error indication and discards the data.
•
The decoder receives an XOFF during a transmission. Data transmission then stops after sending the
current byte. When the decoder receives an XON character, it sends the rest of the data message.
The decoder waits indefinitely for the XON.
Summary of Contents for PL3307
Page 1: ...PL3307 DECODER INTEGRATION GUIDE ...
Page 2: ......
Page 3: ...PL3307 INTEGRATION GUIDE 72E 149624 01 Revision 11 September 2011 ...
Page 6: ...iv PL3300 Decoder Integration Guide ...
Page 15: ...Table of Contents xiii Appendix E ASCII Character Sets Index ...
Page 16: ...xiv PL3307 Decoder Integration Guide ...
Page 20: ...xviii PL3307 Decoder Integration Guide ...
Page 44: ...3 4 PL3307 Decoder Integration Guide Figure 3 3 Imager Engine to PL3307 21 Pin Flex ...
Page 47: ...Accessories 3 7 Figure 3 6 PL3307 30 Pin Host Connector Molex 52437 Series ...
Page 49: ...Accessories 3 9 Figure 3 8 PL3300 microUSB Host Connector Molex 47346 Series ...
Page 52: ...3 12 PL3307 Decoder Integration Guide ...
Page 112: ...5 28 PL3307 Decoder Integration Guide ...
Page 168: ...8 8 PL3307 Decoder Integration Guide Baud Rate continued Baud Rate 460 800 Baud Rate 921 600 ...
Page 276: ...9 92 PL3307 Decoder Integration Guide ...
Page 278: ...10 2 PL3307 Decoder Integration Guide ...
Page 280: ...11 2 PL3307 Decoder Integration Guide ...
Page 298: ...B 8 PL3307 Decoder Integration Guide ...
Page 299: ...APPENDIX C SAMPLE BAR CODES Code 39 UPC EAN UPC A 100 123ABC 0 12345 67890 5 ...
Page 302: ...C 4 PL3307 Decoder Integration Guide QR Code US Postnet UK Postal ...
Page 334: ......
Page 335: ......