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Appendix D - AT Command Summary
RF300E/RF310E 161
Profile 4 (&F4)—HDLC 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=0 Auto-Protocol Detection Disabled
S53=2048 Maximum X.75 Buffer Size (2048 bytes)
&S1 DSR follows DCD
V1 Select verbose messages
!Z=7 Enable HDLC data protocol