Block Transmission Format - sauter SW 1000 Instruction Manual

BCC value is 00H, the sound level meter does not check the data, and the authorised
instruction is processed directly. This way you can simplify the transmission of an
instruction block, but this method is not recommended for long-distance transmis-
sions, as the BCC value is the only possibility to ensure the reliability of data trans-
mission.
Name
BCC

5.2.5 Block transmission format

There are four possible types of block transmission of data: command block, re-
sponse block, acknowledge block and negative-acknowledge block. The four types of
formats and instructions are specified below:
(1) Command block: sent by the computer
<STX> ID
1 1
Where: ATTR = 'C'.
All instructions take 3 bytes. If a block contains more than one parameter, all the pa-
rameters must be separated with a space.
(2) Response block: sent by the sound level meter
<STX>
1
Where: ATTR = 'A'.
If a block contains several response data, all the data must be separated by a
comma (,).
(3) Acknowledge: sent by the sound level meter
<STX>
1
Where: ATTR = <ACK>.
(4) Negative acknowledge: sent by the sound level meter
<STX>
1
Where: ATTR = <NAK>.
The error code takes 4 bytes. All the possible error codes are listed in the table be-
low. Meaning of error codes, see section 5.2.6.
Error code
0001H
0002H
0003H
40
Value in hexadecimal sys-
ATTR Instruction Parameters
1 3
ID ATTR Response
1 1
ID ATTR
1 1
ID ATTR Error code
1 1
tem
01H to FFH
00H
<ETX>
N
<ETX>
N 1
<ETX> BCC
1
<ETX>
4 1
Meaning
Instruction error
Parameter error
Unavailable under the current status
Meaning
XOR checksum
Ignore the checksum
BCC <CR>
1 1 1
BCC <CR>
1 1
<CR>
1 1
BCC <CR>
1 1
SW-BA-e-1710
<LF>
byte
1
<LF>
byte
1
<LF>
byte
1
<LF>
byte
1