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ioLogik R2140 User's Manual
Analog Input
Setting the RS-485 Baudrate
The RS-485 port is used to communicate with other RS-485 devices or to link to another ioLogik
RS-485 I/O server. The RS-485 port can run Modbus/RTU or I/O command sets. The baudrate is set
by a physical dial on the back of the ioLogik R2140. The default settings are baudrate = 115200,
parity check = N, data bits = 8, and stop bit = 1.
Setting the RS-485 Unit ID
The ioLogik R2140 needs to be assigned a unit ID in order to use the RS-485 bus. You may assign a
number from 1 to 31. Unit ID 0 is reserved for the first device on the RS-485 bus, such as a PC or
PLC.
Modbus/RTU Devices
The RS-485 port runs Modbus/RTU and can connect to any Modbus device. You may use different
methods to connect different combinations of ioLogik R2000 servers and other Modbus devices.
Some examples are shown below:
Connecting One Modbus/RTU Device
Baudrate for RS-485
(parameters are N, 8, 1)
Dial setting and corresponding baudrate:
0:115200 1:57600
4:9600
5:4800
2-3
Initial Setup
2:38400
3:19200
6:2400
7:1200
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