Serial Interface 7 - 13
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.
Содержание Symbol PL4507
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Страница 3: ...Symbol PL4507 Decoder Integration Guide 72E 116649 02 Revision A April 2009 ...
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Страница 35: ...Installation 2 7 Figure 2 4 Symbol PL4507 Supply Current 5 V Operation USB Self Powered Scan Decode Session ...
Страница 40: ...2 12 Symbol PL4507 Decoder Integration Guide ...
Страница 43: ...Accessories 3 3 Figure 3 2 Symbol SE4500 to PL4507 21 Pin Flex p n 15 113896 01 ...
Страница 44: ...3 4 Symbol PL4507 Decoder Integration Guide Figure 3 3 Symbol PL4507 30 Pin Host Connector p n 50 12171 030 ...
Страница 45: ...Accessories 3 5 Figure 3 4 Symbol PL4507 30 Pin Mating Host Connector p n 50 12167 030 ...
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Страница 128: ...7 6 Symbol PL4507 Decoder Integration Guide Serial Host Types continued OPOS JPOS Fujitsu Serial ...
Страница 130: ...7 8 Symbol PL4507 Decoder Integration Guide Baud Rate continued Baud Rate 460 800 Baud Rate 921 600 ...
Страница 136: ...7 14 Symbol PL4507 Decoder Integration Guide Software Handshaking continued None ACK NAK ENQ ACK NAK with ENQ XON XOFF ...
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Страница 277: ...Advanced Data Formatting 11 13 Code Types continued MSI GS1 128 UPC E1 Bookland EAN Trioptic Code 39 Code 11 Code 32 ...
Страница 289: ...Advanced Data Formatting 11 25 Numeric Keypad continued 7 8 9 Cancel ...
Страница 317: ...Advanced Data Formatting 11 53 Keyboard Characters continued Send Send Send Send Send Send Send ...
Страница 318: ...11 54 Symbol PL4507 Decoder Integration Guide Keyboard Characters continued Send Send Send Send Send Send 0 Send 1 ...
Страница 319: ...Advanced Data Formatting 11 55 Keyboard Characters continued Send 2 Send 3 Send 4 Send 5 Send 6 Send 7 Send 8 ...
Страница 320: ...11 56 Symbol PL4507 Decoder Integration Guide Keyboard Characters continued Send 9 Send Send Send Send Send Send ...
Страница 321: ...Advanced Data Formatting 11 57 Keyboard Characters continued Send Send A Send B Send C Send D Send E Send F ...
Страница 323: ...Advanced Data Formatting 11 59 Keyboard Characters continued Send N Send O Send P Send Q Send R Send S Send T ...
Страница 325: ...Advanced Data Formatting 11 61 Keyboard Characters continued Send Send Send Send _ Send Send a Send b ...
Страница 327: ...Advanced Data Formatting 11 63 Keyboard Characters continued Send j Send k Send l Send m Send n Send o Send p ...
Страница 329: ...Advanced Data Formatting 11 65 Keyboard Characters continued Send x Send y Send z Send Send Send Send ...
Страница 334: ...11 70 Symbol PL4507 Decoder Integration Guide Send ALT Characters continued Send Alt Send Alt ...
Страница 355: ...Advanced Data Formatting 11 91 Alphanumeric Keyboard Space Single Close Quote Dash ...
Страница 356: ...11 92 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued Comma Single Open Quote ...
Страница 357: ...Advanced Data Formatting 11 93 Alphanumeric Keyboard continued ...
Страница 358: ...11 94 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued _ Underscore ...
Страница 360: ...11 96 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued 6 7 8 9 A B C ...
Страница 361: ...Advanced Data Formatting 11 97 Alphanumeric Keyboard continued D E F G H I J ...
Страница 362: ...11 98 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued K L M N O P Q ...
Страница 363: ...Advanced Data Formatting 11 99 Alphanumeric Keyboard continued R S T U V W X ...
Страница 364: ...11 100 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued Y Z Cancel End of Message a b c ...
Страница 365: ...Advanced Data Formatting 11 101 Alphanumeric Keyboard continued d e f g h i j ...
Страница 366: ...11 102 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued k l m n o p q ...
Страница 367: ...Advanced Data Formatting 11 103 Alphanumeric Keyboard continued r s t u v w x ...
Страница 368: ...11 104 Symbol PL4507 Decoder Integration Guide Alphanumeric Keyboard continued y z ...
Страница 380: ...A 12 Symbol PL4507 Decoder Integration Guide ...
Страница 387: ...Appendix C Sample Bar Codes Code 39 UPC EAN UPC A 100 EAN 13 100 123ABC 0 12345 67890 5 3 456789 012340 ...
Страница 389: ...Sample Bar Codes C 3 Data Matrix Maxicode ...
Страница 390: ...C 4 Symbol PL4507 Decoder Integration Guide ...
Страница 393: ...Numeric Bar Codes D 3 Cancel To correct an error or change a selection scan the bar code below Cancel ...
Страница 394: ...D 4 Symbol PL4507 Decoder Integration Guide ...
Страница 414: ...Glossary 8 Symbol PL4507 Decoder Integration Guide ...
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