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SLAVE protocol
List of available commands
Request for net weight and gross weight.
Gross weight changeover
Net weight changeover
Reset or autotare command
The unit connected to the instrument (typically a personal computer) performs MASTER functions and is
the only unit that can start a communication procedure. The communication procedure must always consist
of the transmission of a string by the MASTER, followed by a response from the concerned SLAVE.
Description of the command format
The double apostrophes (quotation marks) enclose constant characters (respect upper and lower case); the
symbols <and> enclose variable numeric fields.
Request for net weight and gross weight
MASTER:
<Ind> "N" EOT
INSTRUMENT:
<Ind> "N" <state> <net> <gross> ETX <csum> EOT
or
<Ind> NAK EOT
Gross weight changeover
MASTER:
<Ind> "C" "L" EOT
INSTRUMENT:
<Ind> "C" "L" ACK EOT
or
<Ind> NAK EOT
Net weight changeover
MASTER:
<Ind> "C" "N" EOT
INSTRUMENT:
<Ind> "C" "N" ACK EOT
or
<Ind> NAK EOT
Reset or autotare command
MASTER:
<Ind> "A" "A" EOT
INSTRUMENT:
<Ind> "A" "A" ACK EOT
or
<Ind> NAK EOT
Characters used in the strings
<Ind>
= NSTRUMENT address, is the ASCII character obtained by adding 80h to the address num-
ber (example address 1: <Ind> = 80h + 01h = 81h).
<csum>
= checksum of string data; it is calculated by performing the exclusive OR (XOR) of all the
characters from <Ind> to ETX excluding the latter; the result of the XOR is broken down into
2 characters considering separately the 4 upper bits (first character) and the 4 lower bits
(second character); the 2 characters obtained are then ASCII encoded. (Example: XOR =
5Dh; <csum> = "5Dh" ie 35h and 44h.
ETX
= end of text, 03h
EOT
= end of transmission, 04h
Содержание WIN9
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