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LS 6800 Product Reference Guide
Software Handshaking
This parameter offers control of the data transmission process. It may be used instead of, but
not in conjunction with, hardware handshaking.
ACK
/
NAK
handshaking may be combined
with
ENQ
handshaking.
t
No Software Handshaking
t
ACK/NAK Only
The
ACK
/
NAK
option checks the success or failure of transmission. The scanner
expects one of the following host responses after a data transmission:
<
ACK
> - Acknowledges a valid and successful transmission.
<
NAK
> - Indicates a problem with the transmission.
Whenever a <
NAK
> is received, the unit retransmits the same data and awaits an
ACK
/
NAK
response. After three unsuccessful attempts to transmit the same data, the
scanner aborts any further communication attempts on that message. Transmission
error is indicated by the unit sounding 4 short beeps.
t
ENQ ONLY
To ensure that data transmission occurs only when the host is ready to receive, the
ENQ
option requires the host to request data before it is transmitted there.
When the
ENQ
option is enabled, the scanner waits for an
ENQ
(Enquire character)
from the host before it transmits data. The scanner must receive an
ENQ
from the
host within 2 seconds after the last activity or 4 short beeps sound to indicate a
transmission error. The unit is now ready to scan again.
t
ACK/NAK with ENQ
This combines both handshaking options.
t
XON/XOFF
Содержание LS 6800
Страница 1: ...LS 6800 Product Reference Guide ...
Страница 3: ...LS 6800 Product Reference Guide 70 35933 01 Revision A August 1998 ...
Страница 10: ...viii LS 6800 Product Reference Guide ...
Страница 32: ...3 12 LS 6800 Product Reference Guide ...
Страница 100: ...5 60 LS 6800 Product Reference Guide Scanning Modes Cont d LINE ONLY PATTERN FN3 2050905 ...
Страница 114: ...5 74 LS 6800 Product Reference Guide RS 232C HostTypes Cont d BEETLE RS 232C FN3 2050A8C ...
Страница 117: ...5 77 Programming the LS 6800 Baud Rate Cont d 38400 FN3 2090108 ...
Страница 119: ...5 79 Programming the LS 6800 Parity Cont d NONE FN3 2090304 ...
Страница 129: ...5 89 Programming the LS 6800 Software Handshaking Cont d XON XOFF FN3 2090404 ...
Страница 137: ...5 97 Programming the LS 6800 Numeric Bar Codes Cont d 4 5 6 7 FN3 A6 FN3 A4 FN3 A7 FN3 A5 ...
Страница 138: ...5 98 LS 6800 Product Reference Guide Numeric Bar Codes Cont d 8 9 CANCEL FN3 A FN3 A8 FN3 A9 ...
Страница 168: ...6 14 LS 6800 Product Reference Guide ...
Страница 171: ...7 3 ADF Bar Codes Quit Entering Rules Scan this bar code to quit entering rules FN3 6Q QUIT ENTERING RULES ...
Страница 228: ...7 60 LS 6800 Product Reference Guide ...
Страница 244: ...Glossary 10 LS 6800 Product Reference Guide ...