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3.0 Modem Setup Options
3.3.4 D
ISCONNECT
O
PTIONS
When the modem is operating in V.25 bis or Dumb mode, it is necessary to
disconnect the modem from the telephone circuit once communications are
completed. The most common form of disconnection is by dropping the Data
Terminal Ready (DTR) signal from the DTE. However, some applications may
require one of the five available automatic disconnect methods listed below.
For all five disconnect options, "disabled" means the modem will not
disconnect in the presence of the conditions specified below.
The RX (Receive) Space Disconnect option is available for Hayes, V.25 bis,
and Dumb modes. If it is enabled, a 1.6-second continuous space will cause
the modem to disconnect.
NOTE
For Hayes mode operation, both the RX Space Disconnect and TX Space
Disconnect options must be either enabled or disabled.
The TX (Transmit) Space Disconnect option is available for Hayes, V.25 bis,
Dumb modes. When TX Space Disconnect is enabled, the Modem transmits
4 seconds of space prior to disconnecting from the line. This ensures a clean
disconnect if RX space disconnect is enabled on the remote modem.
NOTE
For Hayes mode operation, both the TX Space Disconnect and RX Space
Disconnect options must be either enabled or disabled.
The Character Disconnect option is available for V.25 bis, and Dumb modes.
If it is enabled, a 400-ms loss of carrier signal causes the line to be
disconnected. (To set this option for Hayes mode, use S register S10 --
see Section 5.3.)
The Line Current Disconnect option is available for V.25 bis, Dumb modes.
If enabled, a 400-ms loss of current causes the line to be disconnected.
(To set this option for Hayes mode, use S register S10 -- see Section 5.3.).)
The RTS Disconnect option is available for Hayes, V.25 bis, and Dumb modes.
When RTS Disconnect is enabled, if RTS is off for a selected period
of time (20 to 140 seconds, user selectable), the line is disconnected.
Use pushbuttons 1 and 3 to set the RTS-OFF period required for a
disconnect.