Symbol LS 5700 Product Reference Manual page 105

Parameter Menus
RS-232C Port Host Options
Hardware Handshaking
RTS/CTS Option 3
When Option 3 is selected, the scanner asserts RTS prior to
any data transmission, regardless of the state of CTS. The
scanner waits up to 2 seconds for CTS to be asserted. If CTS
is not asserted during this time, the scanner issues an error
indication and discards the data. The scanner de-asserts
RTS when transmission is complete.
RTS/CTS OPTION 3
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