6.2.2 Modbus RTU with Multiple Slave Devices
In the example host controlled configuration, the Gateway is a Modbus slave to the host system, but remains the master
of the wireless network.
The Gateway is connected directly to the host system using an RS-485 serial cable. This system may also connect DX85
Modbus RTU Remote I/O devices to the serial cable to expand the available I/O. The Gateway and each DX85 connected as
shown below are Modbus slave devices to the host system.
Purpose: This wireless network also collects I/O data and sends it back to a Modbus host system, but adds local wired I/O
points.
Fieldbus Connection
Modbus Slave 2
Modbus Slave 3
2
2
1
Modbus Slave 1
Wireless Network
Host System
(Modbus Master)
Item Model No.
Description
1
DX80G...
DX80 or DX80 Performance Gateway
2
DX85M...
DX85 Modbus RTU Remote I/O
3
MQDC1-5***
Cable, RS-485, quick disconnect 5-pin Euro, female single end, lengths vary (not
shown)
Sure Cross
®
Performance DX80 Wireless I/O Networks
www.bannerengineering.com - Tel: 763.544.3164
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