leaves the editing mode without changing anything.
The sat-nms ACU may be controlled remotely by a monitoring and control application either
through the TCP/IP interface or through a serial RS232 interface (RS232 not yet implemented in
ACU19 and ACU-RMU). Both communication methods use the same commands and parameters.
However, there are different frames around each message depending communication method
used.
Controlling the device from the web interface, the TCP/IP remote control interface or via the serial
interface is completely equal, commands may sent to any interface at any time, the ACU will use
the parameter it receives last.
The ACU knows a number of parameters, each identified by a parameter name. To set a certain
parameter to a new value, a message:
name=value
has to be sent to the ACU. The ACU interprets this command, checks the range of value , sets the
internal parameter and then answers:
name=value
The value in the reply is the value actually recognized by the ACU. For instance, if the requested
value was out of range, the replied (and internally used) value is limited to the applicable
minimum or maximum.
To read a parameter from the ACU, instead of a new parameter value a question mark is sent:
name=?
The ACU replies the actual value in a complete message:
name=value
A complete list of the parameter the ACU knows is shown later in this document in chapter
Parameter list
. Below, some common rules applying to the remote control message syntax are
summarized.
Parameter names always are of lower case letters, most of them are four characters long.
Non-numeric parameter values always are written in upper case.
Numeric (floating point) values may be specified with an arbitrary precision, however the
device will reply only a fixed number of places. The ACU recognizes a decimal point ('.'),
numbers must not contain any commas.
There must not be any whitespace in front or after the '=' in a message.
If the command/query is not of the form name=value or name=? , the ACU replies the
message ?SYNTAX .
If the message syntax is OK, but contains an unknown parameter name is used, the reply is
?UNKNOWN
Numeric parameters are cut to the limits defined for this particular parameter.
Misspelled choice values cause the ACU to set the first value of the choice list.
(C) 2022, SatService GmbH
www.satnms.com
ACU-19V2-UM-2209 Page 38/65
