Transmission Protocol - sauter KERN SW 1000 Instruction Manual

5.2 Transmission protocol

The RS-232 interface protocol for SW 1000/200 is
according to the following pattern
A typical command block or response block consists of a start character, the ID, the
attribute character, the command or data, the end character, the block check character,
the carriage return and carriage return characters, as shown in the following figure:
<STX> ID
5.2.1 Starting and stopping blockwise transmission
A command block or response block contains the start characters, end characters, and
other control characters as shown in the following figure
Name
<STX>
<ETX>
<CR>
<LF>
5.2.2 Device ID
Each command block contains an ID. It is used to distinguish between several sound
level meters in a network. When the sound level meter receives a command block, it
compares the ID in the command block with its own ID. If both match, the
corresponding operation is performed. If not, the command is ignored. The response
block returned by the sound level meter also contains the ID indicating who sent the
block.
☆Note : Make sure that
different, otherwise operation will be disturbed!
The ID is a byte of the binary address. The range is between 1 and 255, the
corresponding hexadecimal value is 01H to FFH.
This means that the command is a broadcast command if the ID is contained in the
command block 00H. The sound level meter executes the instruction independently of
its own ID without data return if the command is a broadcast command.
Name
ID
5.2.3 ATTR attribute characters
The ATTR attribute character specifies the type of command or response.
40
ATTR Command or data
the IDs of the sound level meters in the same network are
based on a blockwise transmission
<ETX>
Hex
02H
03H
0DH
0AH
Hex
01H to FFH
00H
BCC <CR> <LF>
Meaning
Start sign
Stop sign
Carriage returns
Line feed
Meaning
Device ID
Broadcast command
SW-BA-e-2020