Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 17)

Introducing the BM85 Bridge/Multiplexers 31007492 7
initiating or responding to Modbus Plus messages as needed for
higherĆlevel status reporting and control. Library functions are provided
in the BM85 development software for creating multiple tasks within the
BM85's application program, and for assigning and arbitrating the tasks.
BM85
BRIDGE
MULTIPLEXER
1 2 3 4
DISPLAY
SCALE
CONTROLLER
DEVICE
MODBUS
MODBUS PLUS
NOTE 3
NOTE 1
NOTE 2
READER
BARCODE
Figure 2 BM85 With Typical RS232/485 Devices
Figure 2 summarizes the typical layout of devices at the serial ports.
Notes
1. RS232 or RS485 compatible devices are required for the respective
BM85 models. RS232 and RS485 devices cannot be mixed on the same
BM85.
2. Incomingā/āoutgoing access to devices in the application is defined by
the BM85's internal code, programmed by the user and downloaded to
the BM85 across Modbus Plus.
3. Modbus master or slave devices can be used if the userĆdefined code
includes a Modbus protocol handler.