Clear to Send (CTS) - pin 5
Clear To Send indicates that the modem is ready to accept data from
the DTE for transmission to the remote modem.
If an OPTIMA modem is in the Dumb Mode, CTS is OFF in all states except
online state and comes ON at the end of the handshaking process.
If the modem is in the Smart Mode, CTS follows the rules described below:
In the Idle, Online Command, and Analog Loopback states, CTS is ON.
In the Dialing and Handshaking states, and during the Answer Process:
CTS is ON if &Q0, &Q5, &Q6, &Q8 or Q9 (async) communication
modes are in effect.
CTS is OFF if &Q2 or &Q3 (synchronous) communication modes are in
effect.
If &Q1 or &Q4 communication modes are in effect, CTS is OFF if S0 is not
zero and ON if S0 is zero.
In the online state, if:
&Q0 is in effect, CTS is ON.
&Q1 is in effect, CTS goes OFF when the online state is entered for the
time specified by S25 (in seconds). Then CTS goes ON if &R1 is in effect
and tracks RTS if &R0 is in effect.
&Q2 or &Q3 communication modes are in effect, CTS is ON if &R1 is in effect
and tracks RTS if &R0 is in effect.
&Q4 is in effect CTS goes OFF for the time specified by S25 (in seconds)
when the online state is entered. Then CTS follows the Hayes AutoSync specification.
To obtain the AutoSync specification, contact Hayes Customer Service.
CTS goes OFF if carrier is lost from the remote modem and &Q1-&Q4 is
in effect. It comes ON again when carrier is recovered if &R1 is in effect,
or once RTS comes ON if &R0 is in effect.
&Q5 or &Q6 are in effect, CTS is ON unless used for hardware flow control,
which is selected by &K3.
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