User Guide ISDN Terminal Adapter MTA128ST-USB

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Chapter 4 - AT Commands, S-Registers, and Result Codes
USB Port Configuration Commands
Use the following commands to control the interaction between the MTA128ST-USB and the computer
that is connected to it.
Command: En
Function: Command Mode Echo
Values: n = 0 or 1
Default: E1 (Echo on)
Description: When you enter commands on the keyboard, the TA echoes the characters
back to the computer or terminal where they display on the monitor. Use E to
turn this feature on and off.
E0 Echo off
E1 Echo on
Command: L5 and L6
Function: List Active Profile
Values: n = 5 or 6
Default: none
Description: Lists current operating parameters of the TA, which is useful when changing
communications software or changing default settings. ATL5 lists AT
command parameters, and ATL6 lists values currently stored in the S-
registers. (See S-Registers in this chapter for more information).
Command: L8
Function: Display ISDN Status
Values: none
Default: none
Description: Displays low level ISDN status for determining whether the physical layer is
ready, whether the data link layer is ready, what caused a previous
disconnect (Busy, Congestion, Normal Call Clearing, etc.) , and whether (for
North American switch types) SPID numbers have been set up properly
(SPID INCORRECT or SPID CORRECT).
Command: Qn
Function: Enable/Disable Result Codes
Values: n = 0, 1, or 2
Default: Q0 (Enable result codes)
Description: Controls whether the TA sends result codes to the computer. (Use V to
select result code format.)
Q0 Enable result codes.
Q1 Disable result codes (quiet mode) for applications such as computer-
controlled auto dialing.
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.