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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
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.
Assigning a value to a read-only parameter will cause no fault, however the ACU will
overwrite this parameter immediately or some seconds later with the actual value.
7.2 The TCP/IP remote control interface
Controlling the ACU through the network is done by means of HTTP GET requests. Setting
parameter values or querying readings or settings, all is done by requesting HTTP documents
from the ACU. The message to the ACU thereby is coded into the URL as a CGI form parameter.
The ACU replies a one line document of the MIME type 'text/plain'.
The document name for remote control is /rmt , hence (assuming the ACU is listening to the IP
address 10.0.0.1), requesting a document with the URL
http://10.0.0.1/rmt?levl=?
Will let the ACU reply the actual beacon level in a one line text document:
levl=-52.31
This way all parameters may be queried or set, you may use your favorite web browser to try out
the remote control of the ACU manually.
7.3 The RS232 remote control interface
Beside the network interface, the ACU also provides an RS232 serial port which can be used to
control the device remotely. Depending on the device address set, the ACU either runs framed
protocol with start/stop characters and checksum or it provides a dumb terminal interface. The
RS232 interface always operates at 9600 baud, no parity, 8 data bits, one stop bit.
(C) 2022, SatService GmbH
. Below, some common rules applying to the remote control message syntax are
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ACU-19V-UM-2209 Page 38/64
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