Siemens SIMATIC CP 340 User Manual

Basic Principles of Serial Data Transmission
2.7 Parameterization Data
PtP coupling and configuration of CP 340
Manual, 04/2011, A5E00369892-03
63
Protocol
The table below describes the protocol.
Table 2- 2 3964(R) protocol
Parameter Description Default value
3964 with default values and no block
check
 Default values are assigned to the
protocol parameters.
 If the CP 340 recognizes the string
DLE ETX, it stops receiving and
sends a DLE to the communication
partner if the block was received
undamaged, or an NAK if it was
damaged.
3964R with default values and block
check:
CDT = 220 ms
ADT = 2000 ms
Connection attempts = 6
Transmission attempts = 6
3964R with default values and block
check
 Default values are assigned to the
protocol parameters.
 If the CP 340 recognizes the string
DLE ETX BCC, it stops receiving. If
the BCC is correct and no other
receive errors have occurred, the
CP 340 sends the code DLE to the
communication partner. If the BCC
is correct and no other receive
errors have occurred, the CP 340
sends the DLE code to the
communication partner (the NAK
code is sent if an error occurs).
3964 assignable without block check
 The protocol parameters are freely
programmable.
 If the CP 340 recognizes the string
DLE ETX, it stops receiving and
sends a DLE to the communication
partner if the block was received
undamaged, or an NAK if it was
damaged.
3964R assignable with block check
 The protocol parameters are freely
programmable.
 If the CP 340 recognizes the string
DLE ETX BCC, it stops receiving. If
the BCC is correct and no other
receive errors have occurred, the
CP 340 sends the code DLE to the
communication partner. If the BCC
is correct and no other receive
errors have occurred, the CP 340
sends the DLE code to the
communication partner (the NAK
code is sent if an error occurs).

Siemens SIMATIC CP 340 Specifications

General

Brand	Siemens
Model	SIMATIC CP 340
Category	Computer Hardware
Language	English