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24 1892 1335 - Orion Radio Modem Operating Instructions - v1.3 / Aug 2006
OK<CR><LF>
The modem is now ready to be configured.
v Transmission and reception are blocked during Command Mode.
In order to be recognised as the Command Mode instruction rather than data, these
conditions must be fulfilled:
v The RTS line must be set
v No data must be sent to the modem for at least the time set by register S154
v The symbol + must be sent three times consecutively immediately following
the wait period.
v Again, no data must be sent to the modem for at least the time set by
ATS154=
v The next data received by the modem must be <CR><LF> (usually sent from
a terminal by keying <enter>)
If any of these conditions is not fulfilled, then the string "+++" will be transmitted as normal
data. Note that one or more consecutive “+” characters in the input data will be held in the
modem until it is determined that it is not a Command Mode instruction.
Command Syntax
Once in Command Mode, commands are issued by sending a code consisting of several
ASCII characters starting with AT and terminated with <enter>. The modem then responds
with the characters OK or the information requested, followed by <CR><LF>.
Alternatively, any error is indicated by ERROR<CR><LF>.
For example, the parity type can be set to even using:
ATB1=1<enter>
to which the modem responds
OK<CR><LF>