7.4 Behavior of the Sender Line Drivers of the Serial Interface During
Particular Operating Modes of the CP 440
Behavior of the Sender Line Drivers
Table 7-1 Behavior of the Sender Line Drivers
Status Line Drivers
The CP 440 is deenergized High resistance
The CP 440 is in the expansion rack with its own power supply, but the
central controller is switched o.
High resistance
No parameters are assigned to the CP 440. High resistance
Parameters are assignmed to the CP 440; the sender is in an idle state
• 3964
• ASCII, operating mode RS422, multipoint, master
• ASCII, operating mode RS422, multipoint, slave
• ASCII, RS485
• High level
• High level
• High level
• High resistance
Startup Characteristics and Operating Mode Transitions of the CP 440
7.4 Behavior of the Sender Line Drivers of the Serial Interface During Particular Operating Modes of the CP 440
Point-to-point connection CP 440 Installation and Parameter Assignment
Equipment Manual, 03/2022, A5E00057742-AE 93
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