Lenze I/O system 1000 System Manual - Manual (Page 608)

DeviceNet communication
Parameterising technology modules
RS485 interface − EPM−S650
11
l
608 EDSIO1000 EN 7.0
Parameter data − ASCII protocol
Lenze Description/value Name Pos. in
string of
digits
9 Character delay time
(HIGH byte) 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 [ms] (0000
h
.:. FFFF
h
)
0Ah
10 Character delay time (LOW
byte) 0Ah
11 Number of receive buffers Defines the number of receive buffers. As long as only
one receive buffer is used and is assigned, no more
data can be received. If up to 250 receive buffers are
connected, the received data can be redirected to a still
free receive buffer.
1 ... 255 (01
h
... FF
h
)
01
h
12 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
13 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