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RS485-polled interface
The RS485-polled interface is a Half Duplex (3 wires + shield) interface. The
polled configuration can be used for multidrop connections with a PSC Automation
multiplexer or also for a master-slave layout (see section 2.9.1).
The following pins of the 25-pin connector are used for RS485-polled
communications:
Pin
2
4
7
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To select this interface type, follow the instructions in sections 2.3 and 2.4.
For this interface type, the multidrop address must also be set on the DIP switch as
shown in Fig. 2.19 below. Record this information for further setup of the
multidrop line.
Figure 2.19 - DIP switch for multidrop address selection
2.16 - Installation
Name
TX485+
TX485-
SGND
2
TX485+
4
TX485-
7
SGND
Figure 2.18 - RS485-polled connections
SW1
SW2
SW4
SW3
Installation Manual
Function
RS485 input/output (+)
RS485 input/output (-)
Signal Ground
MULTIPLEXER
+ RTX485
- RTX485
RS485REF
SW1
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