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CONTINUOUS FAST WEIGHT TRANSMISSION PROTOCOL
This protocol allows the continuous transmission of the weight at high update frequencies. Up to 300
strings per second are transmitted with a minimum transmission rate of 38400 baud.
Following communication modes availables (see section
SERIAL COMMUNICATION SETTINGS
):
:
communication compatible with TX RS485 instruments
:
communication compatible with TD RS485 instruments
If
is set, the following string is transmitted to PC/PLC:
xxxxxxCRLF
where:
xxxxxx
...... 6 characters of gross weight (48
y
57 ASCII)
CR
................ 1 character return to the start (13 ASCII)
LF
................ 1 character on new line (10 ASCII)
In case of negative weight, the first character from the left of the weight characters takes on the
value
“
-
” (
minus sign - ASCII 45).
In case of error or alarm, the 6 characters of the weight are substituted by the messages
found in the table of the ALARMS section.
If
is set, the following string is transmitted to PC/PLC:
&TzzzzzzPzzzzzz\ckckCR
where:
&
................... 1 initial string character (38 ASCII)
T
................... 1 character of gross weight identification
P
................... 1 character of gross weight identification
zzzzzz
...... 6 characters of gross weight (48
y
57 ASCII)
\
................... 1 character of separation (92 ASCII)
ckck
........... 2 ASCII control characters or calculated considering the characters included
between
“&”
and
“
\
”
excluded. The control value is obtained executing the
XOR operation (exclusive OR) for the 8 bit ASCII codes of the characters
considered. Therefore, a character expressed in hexadecimal is obtained with
2 numbers that may assume values from “0” to
“9” and from “A” to “F”.
“
ckck
” is the ASCII code of the two hexadecimal digits
CR
................ 1 character of end string (13 ASCII)
In case of negative weight, the first character from the left of the weight characters takes on the
value
“
-
” (
minus sign - ASCII 45).
In case of error or alarm, the 6 characters of the gross weight are substituted by the
messages found in the table of the ALARMS section.
FAST TRANSMISSION VIA EXTERNAL CONTACT:
it’s possible to transmit the weight, just once,
even closing an input for no more than a second
(see
OUTPUTS AND INPUTS CONFIGURATION
and
SERIAL COMMUNICATION SETTINGS
sections).
