Specifications

MBX Bridge Help
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To see how this routing works, we will follow a case where a 984 controller at node
address 20 on the Modbus Plus connected to the PCI-85 designated as Device 0 sends a
message to the Compact 984 controller at node address 15 on the Modbus Plus
connected to the PCI-85 designated as Device 1.
1. The originating node at Modbus Plus address 20 sends a message with 5.1.15.0.0
routing. The first two address bytes indicate that the message is addressed to the
PCI-85 at node address 5 over slave path number 1.
2. The MBX Bridge receives the message on MBX Device 0 over slave path number 1.
The message is accepted because it is on the specified slave path and passes the
Source Filter criteria. The MBX Bridge shifts the routing bytes as specified in the
Destination Routing, and sends the message to MBX Device 1 with the new routing
15.0.0.0.0.
3. The message is delivered to its destination at node address 15. The message is
processed and the reply is sent back to the MBX Bridge, which passes it over to the
original node at Modbus Plus address 20.
Modbus Plus / Ethernet
In this example, there is a PCI-85 adapter card configured as MBX device 0 and an
Ethernet MBX device configured as MBX device 1. The MBX Bridge system has two
Ethernet cards with IP addresses 84.0.21.100 and 205.167.7.65. Nodes 2 and 3 on the
Modbus Plus network are BP85 routers connected to separate Modbus Plus networks.
The following table shows a typical configuration for this type of setup.