Download Schneider Electric Modbus Plus Network Bridge Multiplexer none Installation guide

1.13
Bridging
Modbus
1.13.1
How the Bridge
Plus and Serial Devices
Multiplexer
Operates
The BM85 Bridge Multiplexer device operates as a standard Modbus
Plus node, receiving and passing tokens in the network’s address
sequence. It provides four serial port connections to allow Modbus Plus
nodes to communicate with serial devices. BM85 models are available
for support of Modbus, RS232, and RS485 serial devices.
1.13.2
Modbus
Configurations
Each Modbus port can be configured to support a master device, slave
device, or a network of up to 32 slave devices. Selection of ASCII or
RTU mode, baud rate, parity, stop bits, link timeout value, and function
code conversion is also configurable.
Figure 22 illustrates four types of Modbus devices connected to a
Bridge Multiplexer.
MODBUS PLUS NETWORK (UP TO 64 NODES)
CPU
BM85
BRIDGE
MULTIPLEXER
1
2 3 4
CPU
CPU
= MODBUS PORT
P230
PROGRAMMING
PANEL
(MASTER)
Figure
890 USE 100 00
IBM PC
OR
COMPATIBLE
(MASTER)
22
Modbus
Devices
J478
MODBUS
MODEM
CPU
(SLAVE)
MODBUS NETWORK
1 ... 32 DEVICES
Multiplexed
Introducing
to Modbus
Plus
the Modbus
Plus Network
37