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AT*R V.13 Remote RTS Signalling
The *R command allows your modem to simulate carrier control on a Synchronous Link by
transmitting the local state of RTS to the remote modem.
Some systems rely on RTS as an indicator of Terminal Ready to Send. When modems are
inserted between the host and the terminal the status of RTS is not known since the state of RTS
is not normally transmitted over the link. The V.13 recommendation allows the state of RTS ito
be transmitted over the link by sending a unique stream of data. This stream of data will appear
as rubbish to the host (which will discard it), however the receiving modem in V.13 mode will
recognise the stream and convey it to the host via the DCD (RSLD) line. DCD high indicates
remote RTS high and vice versa.
The local CTS line will mimic the state of the local RTS signal on the local modem.
The remote DCD line will mimic the state of the local RTS signal on the remote modem
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When this option is selected the modems may take a little longer to disconnect
than usual since the normal function of Carrier Detect has been disabled. The
modems rely on poor EQM values to confirm disconnect.
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Not available in FSK (V.21 V.23 Bell 103) modes.
Options
AT*R0 ■ V.13 mode off
AT*R1 V.13 mode on
See Also
&M command Synchronous Mode