Black Box MD1640A manual Modem Reset Z, Unix Uucp Spoofing $SP, 32terbo Enable/Disable #V 336 Only

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:

Previous 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.

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