Siemens SINUMERIK 840 Planning Manual page 67

3 Interface Modules
3.4.3 AS 512 protocol
3964-R Protocol header
Start of
procedure Identif.
1 2
STX DLE FF 00
(NAK)
Transmission to SINUMERIK 8X0
Transmission to the other station (e.g. PLC)
AS 512 subsequent message frame
3964-R
Start of
procedure
1
(NAK)
STX DLEFF 00
Transmission to SINUMERIK 8X0
Transmission to the other station (e.g. PLC)
AS 512 subsequent response message frame
3–38
Message
Instr. frame data
3 4 5.............. n (bytes)
41 44
Useful data
Job type
AD(ASCII) = 4144
AX(ASCII) = 4158
Identification of message frame
FF00 = subsequent message frame
Protocol header
Identification E. no.
2 3 4
00 00 00
Hex code of error no.
(if no error: 00)
Identification of the subsequent response message
frame
FF 00 00 = subsequent response message frame
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3964-R
Procedure
termination
DLE ETX BCC
DB
Hex
DX
Hex
3964-R
Procedure
termination
(NAK)
DLE ETX BCC
6FC5 197-0AB20-0BP0
SINUMERIK 840/880 (PJ)
06.91
DLE
(NAK)
DLE