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This interface is not yet implemented in the ACU19 and ACU-RMU! At these versions, you have to
select 'NONE' to enable the function of optional frontpanel display and keyboard. If another
setting is selected, an optional frontpanel and keyboard has no function.
If an address 'A' .. 'G' is selected, the ACU expects each message it receives to be packed into a
frame as described below.
char #
1
2
3
.
.
.
.
n-1
n .tc}
n+1
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.
7.4 Parameter list
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
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example
{
A
l
e
v
l
=
?
end character, always '} '
.
range
www.satnms.com
description
start character, always ' {'
device address (A..G)
first character of the message body
message body ...
..
..
..
last character of the message body
checksum
unit
description
ACU-19V-UM-2209 Page 39/64
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