Devicenet communication – Lenze I/O system 1000 System Manual User Manual
Page 612
DeviceNet communication
Parameterising technology modules
RS485 interface − EPM−S650
l
612
EDSIO1000 EN 7.0
Parameter data 3964(R) protocol
Lenze
Description/value
Name
Pos. in
string of
digits
8
Character delay time
Character delay time; the character delay time defines
the max. permissible interval between two received
characters within a frame. If the character delay time is
0, the module independently calculates the character
delay time on the basis of the baud rate (approx. the
double character time).
0 ... 65535 [20−ms steps] (00
h
.:. FF
h
)
0Ah
9
Acknowledgement time
The acknowledgement time defines the max.
permissible interval until the partner is acknowledged
while establishing/terminating a connection.
0 ... 65535 [20−ms steps] (00
h
.:. FF
h
)
0A
h
10
Block wait time
Maximum time between the recognition of a
requested frame (DLE) and the response.
0 ... 255 [ms] (00
h
... FF
h
)
0A
h
11
STX repetitions
Maximum number of times the EPM−S640 tries to
establish a connection.
0 ... 255 [ms] (00
h
... FF
h
)
05
h
12
DBL
If the block wait time has been exceeded, the number
of STX repetitions for the requested protocol can be
specified here.
0 ... 255 [ms] (00
h
... FF
h
)
06
h
13
Priority
A communication partner has high priority if the
transmission attempt has priority over the partner’s
request to transmit. With a low priority, the partner’s
request to transmit comes first. In case of the protocols
3964(R), both partners must have different priorities.
00
h
: LOW
01
h
: HIGH
00
h
16
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.
00
h
17
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.
13
h