Table of Contents
Advertisement
9 Appendix
9.2 LSV2 procedure
Example:
S
T
S
X
Bit position b1
0
1
b2
1
1
b3
0
0
b4
0
0
b5
0
1
b6
0
0
b7
0
1
b8
0
0
Character
1
0
parity bit
DLE is not included into block checking, if it is transmitted with another data transmission
control character such as DLE STX, DLE ETX.
In the case of the DLE DLE character sequence, the first DLE is not included in the block
check.
If an irregularity is recognized, the receiver acknowledges with NAK. The text can be repeated
after a negative acknowledgement.
Collision
A collision occurs if an ENQ comes after transmission of an ENQ instead of the expected
DLE0.
In this case the station with the higher priority is allowed to transmit.
The station with the higher priority ignores the ENQ received and the other station cancels its
request to send and transmits DLE0.
9–12
I
N
U
M
E
R
1
0
1
1
1
0
0
1
0
0
0
1
0
1
1
1
1
0
1
1
0
1
0
0
0
0
1
0
0
1
0
0
0
0
0
0
1
1
1
1
1
1
0
0
0
0
0
0
1
0
0
0
1
1
© Siemens AG 1989 All Rights Reserved
E
B
I
K
T
C
X
C
1
1
1
0
0
1
1
1
0
0
0
0
1
1
0
1
0
0
0
1
0
0
0
0
1
1
0
1
0
0
0
0
1
0
0
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
08.89
Parity
generation
Advertisement
Table of Contents
