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COURIER HIGH SPEED MODEMS
C-16 Alphabetical Command Summary
&X1 The DTE is the source of the Transmit clock timing
signals and sends them to the Courier over the RS-232
interface. This setting is used typically in leased line
multiplexed operations. (Multiplexors divide the phone
channel so that the channel carries several calls at the
same time.)
The DTE ignores the Courier's clock timing signals and
negotiates the DTE and connection rates.
&X2 The Courier's Receiver clock is the source of the timing
signals. The signals are looped to the Transmit clock and
sent to your DTE over the RS-232 interface. This setting
is only used in those systems that require
synchronization of data flowing in both directions.
&Yn Break handling. This command allows you to send a break to
abort data transfer without disconnecting from the phone link.
&Y0 Destructive, don't send Break.
&Y1 Destructive, expedited (Default).
&Y2 Nondestructive, expedited.
&Y3 Nondestructive, unexpedited; modem sends Break in
sequence with data received from computer or terminal.
&ZC? Display the stored command string.
&ZC=s Write the following command string s to NVRAM. The
command string may be up to 40 characters long; spaces are not
counted. This command can be used so that you can call
another modem without loading your communications
software.
After storing a command, you can program the voice/data
switch to execute the stored command string when pressed.
The following example assigns a command string that displays
the link diagnostics screen when you press the voice/data
switch.
AT&ZC=I6 <Enter>