User's Manual

16
AT Command Listing
This section will list the basic commands required for most applications. Some
commands have parameters associated with them. The format is as follows:
AT&Dn<CR> where “ n” equals the parameter, usually 0 or 1. If a command with a
parameter (n) is issued without the (n), the module will assume that n = 0. For example
issuing AT&D<CR> would equivalent to AT&D0<CR>. The following lists the
available AT commands.
AT Commands
A/ Repeat previous command. The A/ command is not preceded by an “ AT”.
A Listen for Incoming RF Signal - This command instructs the module to listen for
an incoming RF signal from a remote WHM900 and attempt to establish a
wireless data link. The other module must issue an “ ATD” command. When
these commands are entered both modules will display the appropriate
“ LINKING result code. If the data link is successful both modules will then
display the “ CONNECT” result code to reflect the speed at which the two
modules have connected. If no link is established before the time set in S7 register
has elapsed, the module will issue the “ NO CARRIER” result code and return to
the “ AT” off line command mode. When ATA and ATS7=255, the module will
always listen for an incoming RF signal at the frequency defined by the AT%F
command. See the AT–An or AT&Dn commands to the exit the always listening
mode.
-An Any Key Abort Command- This command determines whether any key will abort
an in process link negotiation or be ignored.
-A1 Any Key entered will abort the link negotiation (default).
-A0 Any Key entered during the link negotiation will be ignored.
\An Select Maximum Block Size – The module will operate in an error corrected link
using a maximum block size determined by the parameter supplied.
\A0 8 maximum character blocks.
\A1 16 maximum character blocks.
\A2 24 maximum character blocks.
\A3 32 maximum character blocks (default).