DSP DSP 9612, Руководство пользователя

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Configuring the Modem
Page 17
SW2-8
−
Carrier Control (high- & low-speed modes)
SW2-8 ON = Constant
OFF = Switched
SW2-8 selects either constant or switched carrier. Constant carrier
allows DTEs, such as asynchronous dumb terminals or RTUs, to
operate with modems, without the input RTS signal. When constant
carrier mode is enabled (SW2-8 set to ON), the modem forces the
transmit carrier active and the RTS-CTS delay is minimum (<0.5 ms.).
You can use constant carrier in 4-wire, point-to-point or multi-point
applications (from master to slave modems).
In switched-carrier mode (SW2-8 set to OFF), the RTS/CTS delay is
23 ms.
SW 2-9
−
RX Termination (high- & low-speed modes)
SW2-9 ON = Disable Rx Termination
OFF = Enable Rx termination
SW2-9 selects whether RX termination is enabled for a modem. If you
set this switch OFF, the receiver is terminated with 600
Ω
. If you set
this switch ON, the receiver is not terminated.