ioLogik R1200 Series
Initial Setup
2-4
NOTE
A “load” in a circuit schematic is a component or portion of the circuit that consumes electric power. For the
diagrams shown in this document, “load” refers to the devices or systems connected to the remote I/O unit.
RS-485 Networks
RS-485 permits a balanced transmission line to be shared in a party line or multi-drop configuration. As many
as 32 driver/receiver pairs can share a multi-drop connection on a single two-wire bus. The length of the
network is limited to 4,000 ft between the first node and the last node. You can use RS-485 in two-wire or
four-wire multi-drop network applications.
In an RS-485 four- wire network, one node must be a master node and all others slave nodes. The master does
not require tri-state output.
NOTE
The transmission line is terminated on both ends of the line but not at drop points in the middle of the line.
Termination is only required with high data rates or long wire runs.
Setting the Device ID for RS-485 Serial Communication
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 device ID for each ioLogik R1200
device can be set to any number from 01 to 99 by turning the two rotary dials on the back of the device. The
x1 dial (shown on the left in the figure below) represents the ones place and the x10 dial (shown on the right
in the figure below) represents the tens place. Settings such as the baud rate, parity check, data bits, and stop
bit are configured by software.
Serial Communication Parameters (Initial State)
Communication Parameters (Initial mode)
Parity
None, Even, Odd (default = None)
Data Bits
8
Stop Bits
1, 2 (default = 1)
Baudrate
1200 to 921.6 kbps (default = 9600)
Serial Communication Initial Setup
During your initial setup, set the switch to “Initial” mode to configure your device, after configuration is done
flip the switch back to “Run” mode.
NOTE
The initial communication setting is: baudrate = 9600, n, 8, 1.
