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RASFinder RF300E/RF310E User Guide
RF300E/RF310E158
Command: Unm
Function: B-channel Loop-back
Unit: Decimal ASCII code
Values: n=1—Loop-back on B1 only,
n=2—Loop-back on B2 only,
n=3—loop-back on both B-channels
m=0—disable loop-back,
m=1—enable loop-back
Default: U30 (no loop-back)
Description: >LBn is a test command that is used mainly for conformance testing. Unm puts
specific B-channels in loop-back within the ISDN transceiver as opposed to the
processor dealing with loop-back as is the case for the >LBn command. For
example, ATU31<CR> sets the ISDN transceiver to loop back both B-channel 1 and
B-channel 2 data. ATU30<CR> disables loop-back on both B-channels.
D.6 Factory Profiles
Profile 0 (&F0) Modem-Like Asynchronous Operation
AT Command Description
&C1 DCD functions normally
$D0 Disable persistent DTR dialing
&D1 Hang up when DTR drops
E1 Enable command mode echo
&E4 Enable hardware flow control
&E6 Discard XON/XOFF characters
&E13 Enable pacing
#X0 Disable Sending Multiple Xoff Characters
%E1 Enable +++ escape method
%E4 No OK response to +++ or <BREAK> escape
&R1 CTS always high
&RF1 CTS is independent of RTS
S0=1 Answer after 1 ring
S2=43 Set escape character to + (ASCII 43)
S3=13 Set carriage return character to CR (ASCII 13)
S4=10 Set line feed character to LF (ASCII 10)
S5=8 Set backspace character to BS (ASCII 8)
S7=45 Wait 45 seconds for connection before aborting
S10=20 Set DCD drop time to 700 ms
S25=5 Set DTR detect time to 500 ms
S32=20 Set escape sequence guard time to 2 seconds
S34=2 Set maximum escape sequence character length
S50=0 Caller Line ID disabled
S52=1 Auto-Protocol Detection Enabled
S53=2048 Maximum X.75 Buffer Size (2048 bytes)
&S1 DSR follows DCD
V1 Select verbose messages
!Z=x The data protocol is not modified
Profile 1 (&F1)—V.120 Asynchronous Operation
AT Command Description
&C1 DCD functions normally
$D0 Disable persistent DTR dialing
&D1 Hang up when DTR drops
E1 Enable command mode echo
&E4 Enable hardware flow control
&E6 Discard XON/XOFF characters
&E13 Enable pacing
#X0 Disable Sending Multiple Xoff Characters