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VIPA System SLIO
5.3 STX/ETX
5.3.1 Basics STX/ETX
Mode of operation
Telegram structure
5.3.2 Parameter data of STX/ETX
Parameters
Name
Bytes
PII_L
1
PIQ_L
1
DIAG_EN
1
BAUD
1
PROTOCOL
1
OPTION3
1
OPTION4, 5
2
OPTION6, 7
2
OPTION8
1
OPTION9
1
OPTION10
1
OPTION11
1
OPTION12
1
OPTION13
1
HB300 | CP | 040-1CA00 | en | 18-28
STX/ETX is a simple protocol employing header and trailer. The STX/ETX procedure is
suitable for the transfer of ASCII characters (20h...7Fh). It does not use block checks.
Any data transferred from the periphery must be preceded by an STX (Start of Text) fol-
lowed by the data characters. An ETX (End of Text) must be inserted as the terminating
character. The effective data, which includes all the characters between STX and ETX,
are transferred to the host system when the ETX has been received. When data is sent
any user data is handed to the CP where it is enclosed with an STX start character and
an ETX termination character and transferred to the communication partner.
You may define up to 2 start and end characters. It is also possible to specify a ZNA for
the sending station.
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.
Function
Length process image input data
Length process image output data
Diagnostic interrupt
1)
Baud rate
Protocol
Character frame
ZNA 0 ... 65535 (in ms)
TMO 0 ... 65535 (in ms)
Number Start identification
Start identification 1
Start identification 2
Number End identification
End identification 1
End identification 2
Serial communication protocols
STX/ETX > Parameter data of STX/ETX
Default
DS
02h
1)
2)
02h
1)
2)
00h
00h
00h
80h
02h
80h
13h
80h
0
80h
250
80h
1
80h
2
80h
0
80h
1
80h
3
80h
0
80h
IX
SX
3100h
01h
3101h
02h
3102h
03h
3103h
04h
3104h
05h
3105h
06h
3106h ...
07h ... 08h
3107h
3108h ...
09h ... 0Ah
3109h
310Ah
0Bh
310Bh
0Ch
310Ch
0Dh
310Dh
0Eh
310Eh
0Fh
310Fh
10h
63
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