Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 16)

Introducing the BM85 Bridge/Multiplexers 31007492 6
1.3 Programmable Port Models
Part Number
Mounting
Method
Operating
Power
(Nominal) Modbus Plus
Network
Cable
Serial
Ports Serial
Protocol
NW–BM85E232 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS232 Programmable,
User Defined
NW–BM85D002 19 in Rack 125 Vdc or
24 Vdc Single or Dual RS232 Programmable,
User Defined
NW–BM85E485 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS485 Programmable,
User Defined
NW–BM85S232 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS232 Programmable,
User Defined
NW–BM85S485 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual RS485 Programmable,
User Defined
The four serial ports on these models are programmable by the user to
support custom RS232 or RS485 serial devices.
These models must be downloaded with an executable BM85 application
program across the Modbus Plus network. The downloaded image
contains all of the internal operating code used by the BM85, including
communication protocols for the serial ports: handshaking, protocol
translation between ports, message packaging, buffer space, data
conversion, and error handling. Each serial port indicator is individually
programmable to show the port's status in the application.
The image can contain all of the serial port parameters (for example,
baud rates and parity) as fixed parameters. Alternatively the image
could provide a local protocol (default parameters and a menuing
system) for the user to locally configure the serial ports through a
terminal at one of the ports.
In addition to standard serial devices, Modbus master or slave devices
could be attached at RS232 serial ports if the userĆdefined code includes
a Modbus protocol handler.
You can create the BM85 application program on an IBM PCā/āAT or 100%
compatible, using Modicon BM85 software development tools. These are
available from Modicon Customer Service and are shipped separately
from the BM85. Details of the development tools are provided in
Section 1.4.1.
The BM85 can operate as a fullyĆprogrammed processor in the user
application. The unit can locally manage processes at its serial ports,