Definitions for "Request To Send"
(RTS) A modem control signal sent from the DTE to the modem which tells the modem that the DTE has data to send.
This command puts the modem in originate mode so it can start transmitting.
The laptop's RS-232 port has a RTS that the computer will lower when it wants the ANS to transmit its data over the RS-232 link. [Section 6.3.4
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