ioLogik R2140
Cascading with Other I/O Servers
4-2
Introductino
The ioLogik R2140 can serve as an extension module to provide additional I/O channels to an ioLogik E2210 or
E2240 Ethernet I/O server. Up to 31 units can be chained or cascaded together using each unit’s built-in
connectors.
Cascading System Bus
The I/O servers connect to each other over the cascading system bus, which uses RS-485 and Modbus
protocols. Pin assignments for the female system bus connector are shown below. This is the connector that
protrudes from the right side of the unit.
Pin
1
2
3
4
5
Signal
V+
V-
V+
V-
NC
Pin
6
7
8
9
10
Signal
NC
Data+
SYNC
Data-
GND
Hardware Installation
To install the ioLogik R2140 as an extension module, simply snap it into place alongside the ioLogik E2000 and
the two units will lock together. Press the release button to detach the unit.
Power is provided through the ioLogik E2000’s system bus. Depending on the power requirements of your
application, external power can also be supplied to the unit through the unit’s power terminals.
