User guide

Rev 2.3 Feb.12 227
&D Set DTR mode.
n=0 : Ignore DTR, same effect as HW DTR always asserted (same as
S211=1).
n=2 : Use hardware DTR (same as S211=0).
S211 For applications or situations where hardware control of the DTR signal is not
possible, the device can be configured to ignore DTR. When Ignore DTR is
enabled, the device operates as if the DTR signal is always asserted.
• n=0 : Use hardware DTR. (default).
• n=1 : Ignore DTR.
• n=3 : Ignore DTR and assert DSR. This value is deprecated, and it is
recommended to use &S to control the DSR instead. When this value is
set to 3, &S will automatically be set to 0. See also: &D and &S.
Q The AT quiet-mode setting. If quiet mode is set, there will be no responses to
AT commands except for data queried.
• n=0 : Off (Default).
• n=1 : Quiet-mode on.
S50 Data forwarding idle time-out. If set to 0, a forwarding time-out of 10ms is
used. Used in UDP or TCP PAD mode.
• n=tenths of a second
S51 PAD data forwarding character. ASCII code of character that will cause data to
be forwarded. Used in UDP or TCP PAD mode.
• n=0 : No forwarding character.
E Toggle AT command echo mode.
• n=0 : Echo Off.
• n=1 : Echo On.
With more than one connection types (serial, and Telnet, and USB) the echo
command can be set differently on each interface.
&S Set DSR mode.
• n=0 : Always assert DSR (Default).
• n=1 : Assert DSR when in a data mode (UDP, TCP, PPP, or SLIP)
(Default).
• n=2 : Assert DSR when the device has network coverage.
S211 can also be used to request that DSR is always asserted. If S211 is set
to 3 and &S is changed to a non-zero value, S211 will be changed to 1.
&C Assert DCD
Table E-7: Common: Serial (Continued)
Command Description