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Chapter 3. Application Configuration
This option is provided for situations where equipment connected to
the Express DTE connector cannot slave to the Express-provided
clock. The Express uses the U-interface as the frequency standard
when it must provide a synchronous receive or transmit clock. When
using the Express in a Tail Circuit application, it may be necessary to
add delay to accommodate clock jitter. Entering a number from 0-255
under TxRxDelay will yield the size of the delay buffer, which is ap-
proximately 8x the number selected in bytes.
DTR Options
Press the number corresponding to DTR Options and press
to
Enter
display the DTR options.
Selecting Ignore DTR causes the Express to disregard the state of the
data terminal ready (DTR) pin. Cmd when Off forces the unit into the
AT command processor mode when DTR is not asserted. To return
on-line, DTR must be asserted, followed by the AT0 command. Idle
when Off forces the unit to end the current call when DTR is no longer
asserted. Off>On dial #0 allows one call attempt to be automatically
established when the DTR signal goes from inactive to active. While
DTR is active, dialing is also possible through the built-in menu sys-
tem. When DTR goes inactive, any outgoing or incoming call present
is disconnected. Off>On dial #0 uses the phone number in stored
number register 0 to establish the call. To store a number for automat-
ic dialing, see the section Configuring the Express for V.25 bis In-band Di-
aling on page 3-23. Selecting Dial #0 if On allows calls to be
automatically established when the DTR signal is in the active state.
The unit attempts to establish a call using SN0 until the call is estab-
lished or DTR goes inactive. Selecting Answer if On only allows the
unit to answer an incoming call if the DTR signal is asserted.
61200239L1-20
Express 3010/3110 User Manual
3-9
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