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Chapter 4 - AT Commands, S-Registers and Result Codes
MTA128ST-USB
Command: Sr=n
Function: Set Register Value
Values: r = S-register number; n varies
Default: None
Description:Use Sr=n to set value of an S-register, where r is the number of the S-
register, and n is the value you want to set. See S-Registers in this chapter
for more information.
Command: Sr?
Function: Read Register Value
Values: r = S-register number
Default: None
Description:Use Sr? to read the value of an S-register, where r is the number of the S-
register. See S-Registers in this chapter for further information.
Command: Vn
Function: Terse/Verbose Result Codes
Values: n = 0 or 1
Default: V1 (Verbose)
Description:Use V to control whether the TA’s result codes display as digits (terse) or as
words (verbose). (Use Q to enable or disable the display of result codes.)
V0 Enable terse result codes.
V1 Enable verbose result codes.
Command: Xn
Function: Connect Messages
Values: n = 0, 1, 2, or 3
Default: X2 (Enable all messages)
Description:Use X to select which result code messages the TA sends to the computer.
X0 Enables messages OK, CONNECT, RING, NO CARRIER, and
ERROR (terse result codes 0–4).
X1 Enables all messages except BUSY (terse result codes 0–5, 10–14,
17–19, 28, and 32). If a call is placed to a busy line, the message
NO CARRIER displays.
X2 Enable all messages (terse result codes 0–5, 7, 10–14, 17–19, 28,
and 32).
X3 Enables all messages EXCEPT it does NOT print protocol
messages. For example, for a V.120 connection, X2 prints:
CONNECT 64000/V.120
For a V.120 connection, X3 prints only the connect message (and
speed):
CONNECT 64000
Command: Zn
Function: Reset to Stored Profile
Values: none
Default: none
Description:Resets TA to its current power-up profile and clears the command buffer. The
result is the same as turning the modem off and on. When you enter ATZ,
the state of the &W command determines where the default values originate.
The &W0 defaults come from the customized configuration in NVRAM, and
&W1 defaults come from the factory default configuration in ROM. Because
Z clears the command buffer, it must be the last command in a command
string; normally it is issued by itself: ATZ.