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CHAPTER 5: Command Mode
Many datacomm program issue the &F command automatically—the
&F9 command allows the user to select their own factory defaults. Note
that the &F8/&F9 commands should be used with &W0.
Following is a summary of how the &F and Z reset commands interact
with the &W command; note how the &F reset command operates
differently from the Z reset command:
Pre
vious Command AT&F Power-On and ATZ
AT&W1 (default) ROM ROM
AT&W0 ROM NVRAM
AT&F8&W0 ROM NVRAM
AT&F9&W0 NVRAM NVRAM
Modem Reset Z
The Z command can be used to reset the entire Command Mode
buffer and the result is the same as if you had disconnected, and
then reconnected power to the modem. When an ATZ command is
executed, the state of the &W command determines where the default
values originate. &W0 defaults come from RAM and &W1 defaults
come from ROM.
Unix UUCP Spoofing $SP
The Series II Modem can be configured in a Unix environment that
employs ACK flow control as a means of monitoring data integrity. The
Modem can do “UUCP spoofing”, where the modem is able to generate
ACKs at the DTE interface. Data is transmitted more time efficiently
because the delay of waiting for data to be received, then for an ACK
to be returned at the remote end, is eliminated. The $SP1 command
enables UUCP spoofing and the default command $SP0 disables
UUCP spoofing.
V.32terbo Enable/Disable #V (336 Only)
Other types of V.32/V.32bis modems have problems handshaking when
the Series II Modem 336 (MD1641A) includes V.32terbo mode (19,200 bps)
in its handshaking process. The bits that are used in the rate sequence for
V.32terbo can cause handshaking failure.