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Appendix G
Handheld Data Format Requirements
This appendix provides application notes to describe the general format of data that can be
accepted by the scanner through the auxiliary port as transmitted from a handheld scanner.
Handheld Data Format Requirements General
RS232 - 9600 bps, 8 data bits, 1 stop bit, no parity.
RS-232 RTS is used to “bracket” the data receiv
ed from the handheld: RTS must be
asserted high during data transmission, and de-asserted after label transmission is com-
plete.
No other flow control mechanisms are required or supported.
There must be a delay of at least
2 bit cell times (approximately 208 microseconds)
following the
transmission of the last character before de-assertion of the RTS signal.
The de-assertion of the RTS signal must happen in less than 50 milliseconds after the
last character is tr
ansmitted.
USB handhelds enumerate as a CDC ACM serial device.
USB devices should also bracket the data with the RTS
equivalent.
The time between character transmission can be no longer than 50 milliseconds.
Symbologies requiring fixed lengths (UPC/EAN) will enforce l
ength requirements for
validation of the label.
Handheld will be required to transmit start
and stop characters for
Codabar and
Code39 labels.
Appropriate industrial length requirements will be enforced (if
configured) for valida-
tion of the label.
Maximum label lengths will be enforced for label validation (i.e. labels longer than the
maximum label size will
not be validated).
Standard Datalogic formats generally use a single prefix character. see specific formats
sec
tion.
M
aximum label size allowed including identifiers is 2714 bytes
R
ecommendations:
•Handheld should not be configured for audible label read indication.
•Handheld should not be configured for visual label read indication.
•Handheld should not be configured for continuous label read mode.
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