Schneider Electric Modbus Plus Network Bridge Multiplexer none - Manual (Page 20)

Introducing the BM85 Bridge/Multiplexers 31007492 10
1.5 Modbus Port Models
Part Number
Mounting
Method
Operating
Power
(Nominal) Modbus Plus
Network
Cable
Serial
Ports Serial
Protocol
NW–BM85–000 Panel or Shelf 115/230 Vac Single Modbus ASCII or RTU
NW–BM85C002 Panel or Shelf 115/230 Vac or
24 Vdc Single or Dual Modbus ASCII or RTU
NW–BM85D008 19 in Rack 125 Vdc or
24 Vdc Single or Dual Modbus ASCII or RTU
The four serial ports on these models support Modicon Modbus serial
devices. These models provide the conversion between Modbus
addresses and the required address formats for routing messages to
other Modbus ports or to Modbus Plus nodes.
You must configure these models offline before connecting them to
Modbus Plus or to any devices in your application. You can do this by
connecting a serial terminal to one BM85 port, setting a switch to allow
local setup of the parameters, and applying power to the BM85. The
BM85 displays menus on the terminal for setting up the configuration.
Each port is separately configurable. You assign four kinds of
parameters for each port:
V Port type - Modbus master, `silent master', slave, or network
V Protocol - ASCII, RTU
V Communication parameters - baud rate, stop bits, parity mode
V Address mapping - for conversion between Modbus addresses and
Modbus Plus routing.
In addition to the serial port configurations, the BM85's Modbus Plus
node address must be assigned. This is done in a set of hardware
switches on the rear panel.
When the configuration has been completed, the internal parameters
will be retained by the BM85 after power is removed. If the parameters
are correct, the unit can be transported to the installation site and
installed there without reconfiguration.