3964R appends a
B
lock
c
heck
c
haracter to safeguard the transmitted data. The BCC-
Byte is calculated by means of an XOR function over the entire data of the telegram,
including the DLE/ETX. When a BCC-Byte is received that differs from the calculated
BCC, a NAK is transmitted instead of the DLE.
If two stations should simultaneously attempt to issue a connection request within the
QVZ then the station with the lower priority will transmit the DLE and change to receive
mode.
The driver duplicates any DLE-character that is contained in a telegram, i.e. the
sequence DLE/DLE is sent. During the reception, the duplicated DLEs are saved as a
single DLE in the buffer. The telegram always terminates with the sequence
DLE/ETX/BCC (only for 3964R).
The control codes :
n
02h = STX
n
03h = ETX
n
10h = DLE
n
15h = NAK
5.4.2 Parameter data of 3964(R)
DS - Record set for access via CPU, PROFIBUS and PROFINET
IX - Index for access via CANopen
SX - Subindex for access via EtherCAT with Index 3100h + EtherCAT-Slot
More can be found in the according manual of your bus coupler.
Name
Bytes
Function
Default
DS
IX
SX
PII_L
1
Length process image input data
1)
2)
02h
3100h
01h
PIQ_L
1
Length process image output data
1)
2)
02h
3101h
02h
DIAG_EN
1
Diagnostic interrupt
1)
00h
00h
3102h
03h
BAUD
1
Baud rate
00h
80h
3103h
04h
PROTOCOL
1
Protocol
03h
80h
3104h
05h
OPTION3
1
Character frame
13h
80h
3105h
06h
OPTION4
1
ZNA (x 20ms)
0
80h
3106h
07h
OPTION5
1
ZVZ (x 20ms)
10
80h
3107h
08h
OPTION6
1
QVZ (x 20ms)
10
80h
3108h
09h
OPTION7
1
BWZ (x 20ms)
10
80h
3109h
0Ah
OPTION8
1
STX repetitions
5
80h
310Ah
0Bh
OPTION9
1
DBL
6
80h
310Bh
0Ch
OPTION10
1
Priority
0
80h
310Ch
0Dh
Block check character
(BCC-Byte)
Initialization conflict
Data Link Escape (DLE-
character)
Parameters
VIPA System SLIO
Serial communication protocols
3964(R) > Parameter data of 3964(R)
HB300 | CP | 040-1CA00 | en | 18-28
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