Interfaces
PAD4002A A4243-1.0 HBM: public 27
7 Interfaces
The electronics interface is referenced to GND. The mas
ter interface must also be referenced to GND.
Use a shielded cable as the interface cable. The shield
should always be connected to the housing at both ends.
The shield of the electronics cable must be electrically
connected to the housing of the electronics.
Important
Before mounting several PADs into an installation with a
bus system, take the following into account:
The printed production number (type plate) is required for
setting up data communication. If the type plate can no
longer be seen after installation, the numbers of each
PAD should be noted beforehand. This enables different
addresses to be assigned during the initial start-up.
Alternatively, before connection to the bus system, you
can connect each PAD individually with a PC, in order to
set different addresses (see ADR command in the Online
Help).
7.1 RS‐485 4‐wire interfaces (UART)
The electronics come supplied with an RS-485 interface.
Bit rates of 1200 to 115,200 baud can be set for the inter
face. The ground reference for all the interface signals is
based on the supply voltage ground (GND).
Either a single PAD can be connected via the RS485 in
terface, or you can set up a bus system to connect as
many as 90 PADs to an RS485 interface. All the PADs
are connected in parallel on a line, the total length of the
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