Behavior Of The Sender Line Drivers Of The Serial Interface During Particular Operating Modes Of The Cp - Siemens SIMATIC CP 440 Manual

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
Table 7-1
The CP 440 is deenergized
The CP 440 is in the expansion rack with its
own power supply, but the central controller
is switched off.
The CP 440 is not parameterized.
The CP 440 is parameterized; the sender is
in an idle state
3964
ASCII, operating mode RS422,
multipoint, master
ASCII, operating mode RS422,
multipoint, slave
ASCII, RS485
7-4
Behavior of the Sender Line Drivers
Status
Point-to-point connection CP 440 Installation and Parameter Assignment
Line Drivers
Low impedance
High resistance
High resistance
High level
High level
High level
High resistance
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