8 - 14 DS6878 Product Reference Guide
Software Handshaking
This parameter offers control of the data transmission process in addition to, or instead of, that offered by hardware
handshaking. There are five options.
If Software Handshaking and Hardware Handshaking are both enabled, Hardware Handshaking takes
precedence.
•
None: When this option is selected, data is transmitted immediately. No response is expected from host.
•
ACK/NAK: When this option is selected, after transmitting data, the digital scanner expects either an ACK or
NAK response from the host. When a NAK is received, the digital scanner 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
digital scanner issues an error indication and discards the data.
The digital scanner waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK.
If the digital scanner does not get a response in this time, it issues an error indication and discards the data.
There are no retries when a time-out occurs.
•
ENQ: When this option is selected, the digital scanner waits for an ENQ character from the host before
transmitting data. If an ENQ is not received within the Host Serial Response Time-out, the digital scanner
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 digital scanner transmission off until the digital scanner receives
an XON character. There are two situations for XON/XOFF:
•
XOFF is received before the digital scanner has data to send. When the digital scanner has data to send,
it waits up to Host Serial Response Time-out for an XON character before transmission. If the XON is not
received within this time, the digital scanner issues an error indication and discards the data.
•
XOFF is received during a transmission. Data transmission then stops after sending the current byte.
When the digital scanner receives an XON character, it sends the rest of the data message. The digital
scanner waits up to 30 seconds for the XON.
Summary of Contents for Symbol DS6878
Page 1: ...DS6878 Product Reference Guide ...
Page 2: ......
Page 3: ...DS6878 Product Reference Guide 72E 131700 03 Revision A January 2012 ...
Page 46: ...1 22 DS6878 Product Reference Guide ...
Page 56: ...2 10 DS6878 Product Reference Guide ...
Page 148: ...5 52 DS6878 Product Reference Guide ...
Page 187: ...USB Interface 7 19 USB Polling Interval continued 5 msec 6 msec 7 msec 8 msec 9 msec ...
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Page 306: ...14 32 DS6878 Product Reference Guide ...
Page 417: ...Advanced Data Formatting 16 23 Numeric Keypad continued 7 8 9 Cancel ...
Page 463: ...Advanced Data Formatting 16 69 Send ALT Characters continued Send Alt Send Alt Send Alt ...
Page 484: ...16 90 DS6878 Product Reference Guide Alphanumeric Keyboard Space Single Quote Dash ...
Page 485: ...Advanced Data Formatting 16 91 Alphanumeric Keyboard continued Comma ...
Page 486: ...16 92 DS6878 Product Reference Guide Alphanumeric Keyboard continued ...
Page 487: ...Advanced Data Formatting 16 93 Alphanumeric Keyboard continued _ Underscore ...
Page 489: ...Advanced Data Formatting 16 95 Alphanumeric Keyboard continued 6 7 8 9 A B C ...
Page 490: ...16 96 DS6878 Product Reference Guide Alphanumeric Keyboard continued D E F G H I J ...
Page 491: ...Advanced Data Formatting 16 97 Alphanumeric Keyboard continued K L M N O P Q ...
Page 492: ...16 98 DS6878 Product Reference Guide Alphanumeric Keyboard continued R S T U V W X ...
Page 494: ...16 100 DS6878 Product Reference Guide Alphanumeric Keyboard continued d e f g h i j ...
Page 495: ...Advanced Data Formatting 16 101 Alphanumeric Keyboard continued k l m n o p q ...
Page 496: ...16 102 DS6878 Product Reference Guide Alphanumeric Keyboard continued r s t u v w x ...
Page 497: ...Advanced Data Formatting 16 103 Alphanumeric Keyboard continued y z ...
Page 498: ...16 104 DS6878 Product Reference Guide ...
Page 519: ...Driver s License Set Up DS6878 DL 17 21 Send Control H ...
Page 521: ...Driver s License Set Up DS6878 DL 17 23 Send Control P ...
Page 564: ...B 8 DS6878 Product Reference Guide ...
Page 565: ...Appendix C Sample Bar Codes Code 39 UPC EAN UPC A 100 123ABC 0 12345 67890 5 ...
Page 569: ...Sample Bar Codes C 5 Maxicode QR Code US Postnet UK Postal ...
Page 570: ...C 6 DS6878 Product Reference Guide ...
Page 571: ...Appendix D Numeric Bar Codes ...
Page 574: ...D 4 DS6878 Product Reference Guide ...
Page 575: ...Appendix E Alphanumeric Bar Codes Alphanumeric Keyboard Space ...
Page 576: ...E 2 DS6878 Product Reference Guide Alphanumeric Keyboard continued ...
Page 577: ...Alphanumeric Bar Codes E 3 Alphanumeric Keyboard continued ...
Page 578: ...E 4 DS6878 Product Reference Guide Alphanumeric Keyboard continued ...
Page 579: ...Alphanumeric Bar Codes E 5 Alphanumeric Keyboard continued _ ...
Page 581: ...Alphanumeric Bar Codes E 7 Alphanumeric Keyboard continued 6 7 8 9 End of Message Cancel ...
Page 582: ...E 8 DS6878 Product Reference Guide Alphanumeric Keyboard continued A B C D E F ...
Page 583: ...Alphanumeric Bar Codes E 9 Alphanumeric Keyboard continued G H I J K L ...
Page 584: ...E 10 DS6878 Product Reference Guide Alphanumeric Keyboard continued M N O P Q R ...
Page 585: ...Alphanumeric Bar Codes E 11 Alphanumeric Keyboard continued S T U V W X ...
Page 586: ...E 12 DS6878 Product Reference Guide Alphanumeric Keyboard continued Y Z a b c d ...
Page 587: ...Alphanumeric Bar Codes E 13 Alphanumeric Keyboard continued e f g h i j ...
Page 588: ...E 14 DS6878 Product Reference Guide Alphanumeric Keyboard continued k l m n o p ...
Page 589: ...Alphanumeric Bar Codes E 15 Alphanumeric Keyboard continued q r s t u v ...
Page 590: ...E 16 DS6878 Product Reference Guide Alphanumeric Keyboard continued w x y z ...
Page 591: ...Alphanumeric Bar Codes E 17 Alphanumeric Keyboard continued ...
Page 592: ...E 18 DS6878 Product Reference Guide ...
Page 604: ...F 12 DS6878 Product Reference Guide ...
Page 616: ...Glossary 8 DS6878 Product Reference Guide ...
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