Lenze I/O system 1000 - Page 463

8 DeviceNet communication
8.8 Parameterising technology modules
463
Lenze · I/O system 1000 · Reference Manual · DMS 5.0 EN · 09/2016 · TD17
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18 Operating mode The operating mode determines if the interface is to be
operated half duplex (RS485) or full duplex (RS422).
• 0x00: Half duplex - two-wire operation (RS485)
Half duplex operation means that either transmission or
reception can take place at a time. The data are
transmitted between the communication partners
alternately in both directions.
In case of the half duplex parametersetting under RS485,
no software data flow control is possible.
• 0x01: 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.
0x01
Option 14, cable assignment
19 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.
• 0x00:
No pre-assignment of the receive path. This setting is only
advisable for special drivers that are provided with a bus
capability.
• 0x01:
Signal R(A) 5V (open-circuit monitoring), signal R(B) 0V
In full duplex operation under RS422, open-circuit
monitoring is possible.
• 0x02:
Signal R(A) 0V, signal R(B) 5V
This pre-assignment corresponds to the idle state (no
transmitter active) in half duplex operation under RS485.
Open-circuit monitoring is not possible.
0x00
Position in string Name Description/value Lenze
No.