SERIAL COMMUNICATION PROTOCOLS
The continuous sending is performed at the weight update frequency, compatibly with the serial transmission
baud rate. In case of communication on the Ethernet port, the frequency of the continuous transmission is
limited to 12.5 Hz.
In case of FREE operation, string sent with Continuous, On Demand, Automatic protocols:
STX <status> <weight> ETX <chksum> EOT
Or if sending single cells is selected
STX <status1> <weight1> <weight2> <weight2> <status3> <weight3> <status4> <weight4> ETX <chksum>
EOT
String sent after weighing, with METRIC operation and On Demand protocol:
STX <status> <weight> <measure ID> ETX <chksum> EOT
where:
STX (start of text) = 0x02h, ETX (end of text) = 0x03h, EOT (end of transmission) = 0x04.
<status> = character coded as in the following table (bit = 1 if condition is TRUE):
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
0
0
1
1
Tare Ente-
red
Band of
zero
Weight
Stable
Center of
zero
<weight>
= field consisting of 8 ASCII characters with the weight value justified on the right. (without non-
significant zeros, with any decimal point and negative sign).
The sent weight value can be the net weight, the gross weight or the peak value, based on the selection of the
sent data (MODE parameter) in the setup menu of the serial communication ports (see the relevant paragraph).
In overweight conditions, the field assumes the value: “^^^^^^^^”.
Under underweight conditions (negative weight greater than 99999), the field assumes the value: “_ _ _ _
_ _ _ _”.
In conditions of wrong reading, the field assumes the value: “ O-L ”.
<measure ID>
= field composed of 7 ASCII characters with the identification code of the weighing justified
on the right (without non-significant zeros).
<csum>
= sum of control of string data. It is calculated by executing the exclusive OR (XOR) of all the cha-
racters from STX (or from <Ind>) to ETX excluding the latter; the result of the XOR is decomposed into 2 cha-
racters considering separately the 4 upper bits (first character) and the lower 4 bits (second character); the
2 characters obtained are then ASCII coded; (example: XOR = 5Dh; <csum> = “5Dh” that is 35h and 44h).
In the case of automatic and on demand, communication protocols, the weight must undergo
a variation of 20 divisions between 2 successive transmissions
