These parameters have 5-character command names, they all start with 'e' for 'edit'. The
remaining four characters are identical to the parameter to edit. Example 'eatar' is the edit copy
of the 'atar' parameter, the azimuth target angle. Commanding 'atar' immediately moves the
antenna to the commanded angle, but commanding 'eatar' simply overwrites the value in the
editor.
'tsav' is command to write the edited values back to a target memory in the ACU. 'tsav' also
expects a target number, if the number is not the same as used with 'tedt', 'tsav' act as a 'save as'
command. Again, saving the edited target does not recall the target, does not change any acitve
parameter. The edited target memory is only executed if it is explicitly recalled.
For compatibility with the sat-nms power sensor, the ACU also may be polled for an automated
monitoring by the requesting the 'position' document with a HTTP GET command. Assuming the
ACU listens to the IP address 10.0.0.1, the complete URL for the request is:
http://10.0.0.1/point?fmt=txt
The 'fmt=txt' parameter forces the power sensor to reply a one line text document rather than the
HTML coded page which is normally displayed by the web browser.
The ACU answers a 'text/plain' type document which consists of one line. As shown in the example
below, the line consists of a set of keyword - value pairs, separated by '&' characters. Within each
pair, keyword and value are separated by the '=' character.
apos=174.688&epos=31.456&ppos=-34.5&atar=174.700&etar=31.500&ptar=-34.5&blev=-
64.33&temp=63.5&obit=FFFF0000&ibit=FFFF0000&
4-axis version of the ACU return an extended string with the information for the second
polarization axis added:
apos=174.688&epos=31.456&ppos=-34.5&qpos=-22.4&atar=174.700&etar=31.500&ptar=-
34.5&qtar=-22.4&blev=-
64.33&temp=63.5&obit=FFFF0000&obi2=F0&ibit=FFFF0000&ibi2=FF00&
The format does not use fixed column widths for the values, however the precision of floating
point values is always as shown in the example. An application which parses this string should not
rely on the order of the values in the line. Future version of the ACU may provide additional
values which not necessarily will appear at the end of the line. A description of the parameters is
given in the chapter
Parameter list
above.
The ACU provides a SNMP agent which permits to monitor and control all relevant parameters of
the device using an SNMP network management system. The SNMP agent listens at the SNMP
standard port 162, it complies to the SNMPv1 standard. The read / write community strings
default to 'public', this may be changed through the ACU's WebGUI at the 'Setup' page.
All ACU parameters are collected in an enterprise specific MIB which may be downloaded from the
device at the 'Setup' page. The 3-axis and 4-axis models of the ACU are using different MIBs. The
3-axis MIB (named ACU2.MIB) is widely compatible to former models of the ACU. The MIB for the
4-axis model (ACU3.MIB) has been re-organized to have the 4th axis' parameters at positions in
(C) 2022, SatService GmbH
www.satnms.com
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