RS-232 Interface 8 - 13
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
: Select this to transmit data immediately. The device expects no response from the host.
•
ACK/NAK
: If you select this option, after transmitting data, the device expects either an ACK or NAK
response from the host. When it receives a NAK, the device transmits the same data again and waits for
either an ACK or NAK. After three unsuccessful attempts to send data after receiving NAKs, the device
issues an error indication and discards the data.
The device waits up to the programmable Host Serial Response Time-out to receive an ACK or NAK. If the
device 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
: If you select this option, the device waits for an ENQ character from the host before transmitting data.
If it does not receive an ENQ within the Host Serial Response Time-out, the device 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 device transmission off until the device receives an XON
character. There are two situations for XON/XOFF:
•
The device receives an XOFF before has data to send. When the device has data to send, it waits up to
Host Serial Response Time-out for an XON character before transmission. If it does not receive the XON
within this time, the device issues an error indication and discards the data.
•
The device receives an XOFF during a transmission. Data transmission then stops after sending the
current byte. When the device receives an XON character, it sends the rest of the data message. The
device waits indefinitely for the XON.
Summary of Contents for MT2070
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Page 3: ...MT2070 MT2090 User Guide 72E 117859 06 Revision A June 2014 ...
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Page 22: ...xxii MT2070 MT2090 User Guide Index Glossary Tell Us What You Think ...
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Page 435: ...Advanced Data Formatting 14 25 Numeric Keypad continued 7 8 9 Cancel ...
Page 480: ...14 70 MT2070 MT2090 User Guide Send ALT Characters continued Send Alt Send Alt ...
Page 501: ...Advanced Data Formatting 14 91 Alphanumeric Keyboard Space Dash ...
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Page 503: ...Advanced Data Formatting 14 93 Alphanumeric Keyboard continued ...
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Page 507: ...Advanced Data Formatting 14 97 Alphanumeric Keyboard continued D E F G H I J ...
Page 508: ...14 98 MT2070 MT2090 User Guide Alphanumeric Keyboard continued K L M N O P Q ...
Page 509: ...Advanced Data Formatting 14 99 Alphanumeric Keyboard continued R S T U V W X ...
Page 511: ...Advanced Data Formatting14 101 Alphanumeric Keyboard continued d e f g h i j ...
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Page 540: ...A 10 MT2070 MT2090 User Guide ...
Page 548: ...B 8 MT2070 MT2090 User Guide ...
Page 549: ...Appendix C Sample Bar Codes UPC A UPC E 0 12345 67890 5 0 123456 5 ...
Page 551: ...Sample Bar Codes C 3 Trioptic Code 39 Code 93 Code 11 456123 12345ABCDE Æ1234567890Æ ...
Page 553: ...Sample Bar Codes C 5 PDF417 Data Matrix Maxicode ...
Page 554: ...C 6 MT2070 MT2090 User Guide QR Code US Postnet UK Postal ...
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Page 559: ...Appendix E Alphanumeric Bar Codes Alphanumeric Keyboard Space ...
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Page 561: ...Alphanumeric Bar Codes E 3 Alphanumeric Keyboard continued ...
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Page 565: ...Alphanumeric Bar Codes E 7 Alphanumeric Keyboard continued 5 6 7 8 9 End of Message Cancel ...
Page 566: ...E 8 MT2070 MT2090 User Guide Alphanumeric Keyboard continued A B C D E F ...
Page 567: ...Alphanumeric Bar Codes E 9 Alphanumeric Keyboard continued G H I J K L ...
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