User Guide ISDN Terminal Adapter MTA128ST-USB

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MultiModemISDN User Guide
&E3 Disable flow control by the TA
&E4 Hardware flow control. &E4 causes the TA to use the CTS signal on
pin 5 of the RS232E/V.24 interface to regulate flow control. When
CTS goes low, data flow from the computer is suspended until CTS
goes high again. This method works with pacing, which uses the
RTS signal on pin 4. Hardware flow control cannot be enabled
unless an error correction protocol is selected.
&E5 XON/XOFF flow control. This is an in-band method, in which the
XON and XOFF characters (^Q and ^S, respectively) are inserted
into the data stream, rather than using separate control lines. When
an XOFF character is detected, the data stream is suspended until
an XON character is detected. The drawback to this method is that
some files may contain these characters, causing the file transfer to
be suspended indefinitely.
&E6 When XON/XOFF pacing is active, TA responds to and discards the
XON/XOFF characters from the computer.
&E7 When XON/XOFF pacing is active, the TA responds to the XON/
XOFF characters and passes them through the communications link
to the remote device, thereby pacing the remote terminal adapter as
well.
&E12 Disables pacing
&E13 Enables pacing
Command: #Xn
Function: Send Single/Multiple Xoff Characters
Values: n = 0 or 1
Default: #X0
Description: Allows TA to send either a single or multiple Xoff characters to exert flow
control to the terminal.
The #X0 command (factory default setting) causes one Xoff to be sent until
the MTA128ST-USB's buffer reaches the Xon level. The #X1 command uses
an Xoff to be sent for every character received after TA reaches its buffer full
level.
#X0 One Xoff character sent until buffer reaches the Xon level (default)
#X1 Multiple Xoff characters sent for every character received after buffer
reaches the full level
Command: &Fn
Function: Load Quick Setup Profile
Values: n = 0–4
Default: &F0
Description: For quick setup, the TA includes six Quick Setup Profiles, each contains
configuration parameters for a specific type of port operation. To load a
Quick Setup Profile into active memory, use &Fn, where n is the profile
number to load. You then can customize the profile and store it using the &W
command, so it loads automatically on power-up or reset. These profiles are
stored in permanent memory and are not user configurable. (Appendix B.)
&F0 Profile 0 — Modem-like operation (default)
&F1 Profile 1 — V.110 async operation*
&F2 Profile 2 — V.120 async operation
&F3 Profile 3 — X.75 async operation
&F4 Profile 4 — MLPPP async operation