Cellaview Via Rs485 Bus Connection - Siemens MPA 1 Series Instruction Manual

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12.3

CellaView via RS485 bus connection

The RS485 two-wire bus consists of the bus cable itself with a maximum
length of 1200 m. The participants are connected to this cable via a
branch line with a length of 5 m max.
Up to 31 pyrometers can be connected to the RS485 bus. CellaView
controls the communication on the bus and prompts allocated pyrome-
ters to send or to receive data. Each participant will be addressed by a
unique address. Configure this address during setup of each pyrometer
using the keyboard.
Configuration layer:
Device address
ADDR.
A USB/RS485 converter is needed when working with the RS485 inter-
face. The pyrometer can be directly connected if the PC has an integrat-
ed RS485 Interface board.
In order to prevent reflections on the RS485 connection, it is absolutely
necessary to terminate the bus system with termination network. The
termination can be activated or deactivated by a DIP switch on the py-
rometer. The termination is active when delivered from the factory.
Moreover, use a converter with galvanic isolation (e.g. W&T 38211) to
avoid problems with ground loops.
C011
Enter address of device for
protocol mode
37
Operating Manual MPA