ADOS S.R.L. Buccinasco (MI)
417-MTA200I1
Rev. 9
Page 33 of 77
2.14.2 Multidrop networks
The instrument can control the primary serial line to operate in a multidrop network, where more
than one transmitter is connected to the same host system.
The logic protocol (either ADOS proprietary or MODBUS) is half duplex master/slave and the
instrument responds as a slave.
When using ADOS protocol the point to point or multidrop connection is determined by the value
of the configuration parameter “address 485”: if the parameter is 0 the connection is point to point,
otherwise it is multidrop.
The modality is activated independently from the physical configuration of the board, therefore it is
possible to operate with addressed frames on the physical line RS232.
The data frames are the same in both configuration, with the only addition of the address field (two
characters from “01” to “32”) in reception and in transmission.
When using MODBUS protocol the connection is always multidrop.
2.14.3 Continuous modality
The instrument continuously transmits a string with the following format:
<STX><POL><WEIGHT><K/L><L/N><STATUS><CR><LF>
where:
<STX>
“Start Of Test” (Hex 02) character
<POL>
“Blank” (Hex 20) or “-” (Hex 2D) character to indicate the polarity of the data
< WEIGHT >
string of 7 numerical characters (Hex 30 .. 39) representing the weight shown on
display and possibly with “.” (Hex 2E)
<K/L>
“K” (Hex 4B) or “L” (Hex 4C) character to indicate the unit of measurement
<G/N>
“G” (Hex 47) or “N” (Hex 4E) character to indicate the Gross/Net state
<STATUS>
one of the following characters:
“Blank”
(Hex 20)
System under normal operating conditions
“I”
(Hex 43)
Instrument to calibrate (invalid data)
“C”
(Hex 43)
Instrument being configured
“O”
(Hex 4F)
Instrument off scale
“M”
(Hex 4D)
Moving weight
<CR>
“Carriage Return” character (Hex 0D)
<LF>
“Line Feed” character (Hex 0A)
2.14.4 Bi-directional modality with ADOS protocol
In this modality the instrument transmits the data only when requested by an external system.
