Lenze I/O system 1000 System Manual - Manual (Page 709)

PROFINET communication
Parameterising technology modules
RS485 interface − EPM−S650
12
l
709 EDSIO1000 EN 7.0
Parameter data STX/ETX protocol
Lenze Description/value Name Data set Lenze Description/value Name
Byte No.
9 End identifier 1 ASCII value of the end character that is sent after
a frame and marks the end of a transmission.
1 ... 255 (01
h
... FF
h
)
03
h
10 End identifier 2 ASCII value of the end character that is sent after
a frame and marks the end of a transmission.
1 ... 255 (01
h
... FF
h
)
00
h
11 Operating mode Operating mode of the interface
00
h
: Half duplex − two−wire operation (RS485);
the data are transferred alternately in both
directions between the communication partners.
01
h
: Full duplex − four−wire operation (RS422);
the data are exchanged simultaneously between
the communication partners; transmission and
reception can take place at the same time. Each
communication partner must simultaneously
actuate a receive path.
Note: For the "Half duplex" parameterisation
under RS485, no software data flow control is
possible.
01
h
12 Cable assignment For a connection with minimum reflections and
the open circuit detection in RS422/485
operation, the cables can be pre−assigned via
parameters with a defined idle level (
^ 228).
00
h
: No pre−assignment of the receive path. This
setting is only advisable for special drivers that
are provided with a bus capability.
01
h
: Signal R(A) 5 V (open circuit monitoring);
signal R(B) 0 V. In full duplex operation under
RS422, open circuit monitoring is possible.
02
h
: Signal R(A) 0 V; signal R(B) 5 V. This
pre−assignment corresponds to the idle state (no
transmitter active) in half duplex operation
under RS485. Open circuit monitoring is not
possible.
01
h