Weidmuller WI-I/O-9-U2: Wireless Mesh I/O & Gateway User Manual V1.2.2 - Manual (Page 28)

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RS-485 port with Modbus Support.
The WI-I/O 9-U2 module provides an RS-485 serial port, which supports operations at
data rates up to 230,400 baud. Default baud rate is 9600 baud, No Parity, 8 data bits
and 1 stop bit which match the WI-I/O-EX-1-S serial expansion modules defaults. This
port Supports MODBUS protocol.
The RS-485 port terminal is host
ed on the 4 way “Expansion” connector on the bottom
edge of the module. An on-board RS485 termination resistor provides line attenuation
for long runs. As a general rule moreover, a termination resistors should be placed at
each end of the RS485 cable. When using Expansion I/O module remember to
switch in the termination resistor on the end module.
Figure 10 – RS485 Connections
2.5.2 Side Access Configuration Panel
Figure 11 – Side Access Panel
On the side of the module is a small access cover that hides a “Factory Boot” switch,
USB Host port and a small bank of dipswitches that are used for Analog input
voltage/current selection, External Boot and Default configuration settings.
WI-IO 9-U2