Paradyne COMSPHERE 3800PLUS, User Manual

Page: 150 / 217

COMSPHERE 3800Plus Modems
13-16 October 1998 3980-A2-GB30-40
Table 13-1
(14 of 15)
3800
Plus AT Commands
AT Command Front Panel Branch Description
%R
Async DTE Rate
Sets the DTE rate for Asynchronous mode. This configuration option has
no effect in Sync or Async Direct modes, where the DTE rate always
equals the VF rate.
%R n must be the last command in a command string.
The %R
n command does not disable autobauding. If a command is
received from the DTE at a new rate, the modem will autobaud to that rate,
replacing the current %R value. If a factory preset is selected with an
AT&F
n command, the autobauding rate is not changed.
Rates above 19,200 bps are not defined in RS232E, but can function
correctly in many cases. For higher rates, take the following precautions:
•
Use as short a DTE cable as possible. A special low-capacitance cable
may be required.
•
For an IBM-compatible PC, ensure that the serial port uses a buffered
UART such as the 16550.
If you experience overruns, it may be that your DTE cannot handle higher
DTE rates. Try a lower value.
%R300 0–300 bps
%R1200 1200 bps
%R2400 2400 bps
%R4800 4800 bps
%R7200 7200 bps
%R9600 9600 bps
%R12000 12,000 bps
%R14400 14,400 bps
%R19200 19,200 bps
%R28800 28,800 bps
%R38400 38,400 bps
%R57600 57,600 bps
%R76800 76,800 bps
%R115200 115,200 bps
Configure\Edit\
DTE Interface
#DM n SDC Delay Minimization
Minimizes the delay introduced by SDC by allowing the modem to
transmit a DTE frame to its DTE in a discontinuous way.
#DM0 No delay minimization. The modem does not begin
transmitting a frame to its DTE until the entire frame has been
received.
#DM1 Delay minimization. The modem begins to transmit data from
a DTE frame to its DTE even if the end of the DTE frame has
not yet been received by the modem.
Configure\Edit\
V42/MNP/Buffer
#Q n Sync Flow Ctrl
Controls the type of synchronous data flow control while using data
compression.
#Q0 No flow control.
#Q1 Flow control using transmit clock (circuit 114).
#Q2 Flow control using CTS (circuit 106).
Configure\Edit\
V42/MNP/Buffer