.
v
..
.
l
..
.
=
..
n-1
?
last character of the message body
n .tc}
end character, always '} '
n+1
.
checksum
The checksum byte is calculated using an algorithm as implemented by the following formula:
This protocol type is known as MOD95- or Miteq protocol . The ACU also packs its reply in a
protocol frame as described above. Incomplete frames, checksum errors or address mismatches
let the ACU ignore the message. The time between the characters of a message must be less
than 5 seconds or the ACU will treat the message as incomplete.
If the ACU is set to the device address 'NONE', it uses a simple line protocol instead of the framed
protocol described above. Messages sent to the ACU have to be terminated with a carriage return
character (ASCII 13), the ACU terminates replies with a CR/LF pair (ASCII 13/10). There is no
echo for characters entered, hence this protocol easily may be used for computer based remote
control. This setting is also used for allowing communication to an optional frontpanel display and
keyboard if implemented.
If 'TERM' is selected the serial interface is used to allow communication between the ACU and a
sat-nms Handheld. This function is not available at ACU-RMU and ACU19 Version.
The table below shows the complete list of M&C parameters the ACU knows in alphabetical order.
For each parameter the valid range and a short description is given.
name
range
unit
description
aabw
r/o
??
AZ antenna 3dB
beamwidth
aalt
0 .. 8000
m
Antenna abs. altitude
aamp
r/o
%
AZ Amplitude
acal
-3600.000 .. 3600.000
??
AZ Calibration offset
aclc
??
Calculate offset from Az.
value
acoe
r/o
see below
-
AZ model coefficients
acou
-180.000 .. 180.000
??
Antenna course
add5
A B C D E F G NONE
-
RS485 address
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www.satnms.com
ACU2-19V2-UM-2209 Page 62/99
