Wood and Douglas 1335, Operating Instructions Manual

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1892 1335 - Orion Radio Modem Operating Instructions - v2.9 / Aug 2009
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 may be held in the
unit until it is determined that it is not a Command Mode instruction.
Command Syntax
Once in Command Mode, commands are issued by sending codes consisting of ASCII
characters.
All commands start with the characters AT. Further characters are added to identify the
particular command. Most commands have two versions, to set or read parameter(s),
indicated by = or ? respectively. When setting, parameters may follow the =, separated by
commas. Commands are terminated with <CR><LF>.
After setting a parameter the unit responds with:
OK<CR><LF> if a valid entry and
ERROR<CR><LF> if an invalid entry
For example, the parity type can be set to even using:
ATB1=1 <enter>
to which the unit responds
OK <CR><LF>
The current value of most parameters can be found out by adding a question mark instead of
equals to the end of the code which sets it, for example:
ATB1? <enter>
to which the unit responds
1 <CR><LF>
Capital letters MUST be used for all command instructions.
Where a command takes a numeric parameter, the number of possible places before and
after the decimal point (as applicable) are shown in the command references as lower-case
characters. For example, a frequency could be shown as xxxx.xxxxxx. (The actual valid range
will be stated.)