HBM PW15iA, Инструкция по монтажу, Страница: 29 / 104

Interfaces
PW15iA
A4359-1.0 HBM: public
27
7 Interfaces
The ground reference for all the interface signals is
based on the supply voltage ground (GND). GND (0V) of
the excitation voltage must therefore also be connected,
but you must not connect GND to the shield. Use a sepa­
rate line to connect the node digital ground to the power
supply GND (0V).
Use a shielded cable as the interface cable. The shield
should always be connected to the housing at both ends.
Important
Before installing several digital load cells into an installa­
tion 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
digital load cell should be noted beforehand. This enables
different addresses to be assigned during initial opera­
tion.
Alternatively,
before
connection to the bus system, you
can connect each digital load cell 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 PW15iA comes supplied with an RS-485 interface.
Bit rates of 1200 to 115,200 baud can be set for the inter­
face.
Either a single digital load cell can be connected via the
RS485 interface, or you can set up a bus system to con­