EasyManua.ls Logo

VIPA System 300S SPEED7 CPU 313SC/DPM - Page 126

VIPA System 300S SPEED7 CPU 313SC/DPM
152 pages
To Next Page IconTo Next Page
To Next Page IconTo Next Page
To Previous Page IconTo Previous Page
To Previous Page IconTo Previous Page
Loading...
Chapter 6 Deployment PtP communication Manual VIPA System 300S SPEED7
6-4 HB140E - CPU SC - RE_313-6CF03 - Rev. 07/45
The 3964R procedure controls the data transfer of a point-to-point link
between the CPU and a communication partner. The procedure adds
control characters to the message data during data transfer. These control
characters may be used by the communication partner to verify the
complete and error free receipt.
The procedure employs the following control characters:
STX Start of Text
DLE Data Link Escape
ETX End of Text
BCC Block Check Character
NAK Negative Acknowledge
STX
DLE
Message-data
DLE
ETX
BCC
Monitor delayed acknowledgment
DLE
Monitor delayed acknowledgment
A
ctive partner
Passive partne
You may transfer a maximum of 255Byte per message.
Note!
When a DLE is transferred as part of the information it is repeated to
distinguish between data characters and DLE control characters that are
used to establish and to terminate the connection (DLE duplication). The
DLE duplication is reversed in the receiving station.
The 3964R procedure requires
that a lower priority is assigned to the
communication partner. When communication partners issue simultaneous
send commands, the station with the lower priority will delay its send
command.
3964R
Procedure

Table of Contents

Related product manuals