Paradyne COMSPHERE 3800PLUS User Manual page 150

COMSPHERE 3800Plus Modems
AT Command
%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
%R1200
%R2400
%R4800
%R7200
%R9600
%R12000
%R14400
%R19200
%R28800
%R38400
%R57600
%R76800
%R115200
#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
#DM1
#Q n Sync Flow Ctrl
Controls the type of synchronous data flow control while using data
compression.
#Q0
#Q1
#Q2
13-16
Table 13-1
(14 of 15)
3800 Plus AT Commands
Description
0–300 bps
1200 bps
2400 bps
4800 bps
7200 bps
9600 bps
12,000 bps
14,400 bps
19,200 bps
28,800 bps
38,400 bps
57,600 bps
76,800 bps
115,200 bps
No delay minimization. The modem does not begin
transmitting a frame to its DTE until the entire frame has been
received.
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.
No flow control.
Flow control using transmit clock (circuit 114).
Flow control using CTS (circuit 106).
October 1998
Front Panel Branch
Configure\Edit\
DTE Interface
Configure\Edit\
V42/MNP/Buffer
Configure\Edit\
V42/MNP/Buffer
3980-A2-GB30-40