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S9
Reserved register. (Functions are subject to change without
notice.)
510
Reserved register. (Functions are subject to change without
notice.)'
511
Reserved register. (Functions are subject to change without
notice.)
SI 2
The S12 register allows you to change the time required for the
modem to recognize the escape command + + + . Delay peri¬
ods occur immediately before and after entering the escape
command. By increasing the delay, you reduce the possibility of
entering the escape command accidentally while online. If you
change the value of this register to zero (0), no delay is required
for the modem to recognize the escape command; you may not
be able to type the command fast enough for it to be recog¬
nized, but a remote system will probably be fast enough.
SI 3
The bit-mapped SI3 register determines how characters are
formatted so that communication can take place. It is primarily
used for factory testing and is not meant to be used to control
your modem. By default, the modem uses the basic set of mes¬
sages (described iri Appendix D), no parity, 8 data bits for char¬
acter length, and sets the eighth data bit for space. (See Table 3
for the individual bit settings.)
SI 4
The bit-mapped SI4 register sets a variety of modem functions.
Most of these functions can and should be controlled by using
the programmable options, described in Using Programmable
Options, or the basic modem commands, described in Chapter 2
under Using Modem Commands. The register is primarily used
for factory testing and is not meant to be used to control your
modem. By default, the automatic answer feature is disabled, the
characters you type are "echoed'' (displayed on the screen),
messages are displayed on your screen in words, the modem
recognizes your commands and is set for pulse dialing, and the
built-in speaker is on until a carrier signal is detected.
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