
Specification
28
3.10 DSENET® FOR EXPANSION MODULES
DSENet® is the interconnection cable between the host controller and the expansion module(s) and
must not be connect to any device other than DSE equipment designed for connection to the
DSENet®
Cable type
Two core screened twisted pair
Cable characteristic
impedance
120
Ω
Recommended cable
Belden 9841
Belden 9271
Maximum cable length
1200m (¾ mile) when using Belden 9841 or direct equivalent.
600m (666 yds) when using Belden 9271 or direct equivalent.
DSENet® topology
“Daisy Chain” Bus with no stubs (spurs)
DSENet® termination
120
Ω
. Fitted internally to host controller. Must be fitted externally to
the ‘last’ expansion module by the customer.
Maximum expansion
modules
Total 20 devices made up of DSE2130 (up to 4), DSE2131 (up to 4),
DSE2133 (up to 4), DSE2152 (up to 4), DSE2157 (up to 10), DSE2548
(up to 10)
This gives the possibility of :
Maximum 32 additional 0-10V or 4-20mA outputs (DSE2152)
Maximum 80 additional relay outputs (DSE2157)
Maximum 80 additional LED indicators
Maximum 24 additional Ratio-metric or Thermocouple inputs
(DSE2133).
Maximum 40 additional inputs (All can be configured as either digital,
resistive, 0-10V or 4-20mA when using DSE2131)
NOTE: As a termination resistor is internally fitted to the host controller, the host
controller must be the ‘first’ unit on the DSENet®. A termination resistor MUST be fitted to the
‘last’ unit on the DSENet®. For connection details, you are referred to the section entitled
‘typical wiring diagram’ elsewhere in this document.
NOTE : DSE7400 series module does not support the DSE2510/2520 display modules.
3.10.1 DSENET® USED FOR MODBUS ENGINE CONNECTION
As DSENet® utilises an RS485 hardware interface, this port can be configured for connection to
Cummins Modbus engines (Engines fitted with Cummins GCS).
This leaves the RS485 interface free for connection to remote monitoring equipment (i.e. Building
Management System, PLC or PC RS485 port).
While this is a very useful feature in some applications, the obvious drawback is that the DSENet®
interface is no longer available for connection to expansion devices.
Example of configuring the DSENet® for connection to Cummins QST GCS using the DSE
Configuration Suite Software: