Specification
24
3.9.5 RS485
The RS485 ports on the controller support the Modbus RTU protocol.
The DSE Gencomm register table for the controller is available upon request from the DSE Technical
Support Department.
RS485 is used for point-to-point cable connection of more than one device (maximum 32 devices)
and allows for connection to PCs, PLCs and Building Management Systems (to name just a few
devices).
One advantage of the RS485 interface is the large distance specification (1.2km when using Belden
9841 (or equivalent) cable. This allows for a large distance between the module and a PC running the
DSE Configuration Suite software. The operator is then able to control the module, starting or
stopping the generator, selecting operating modes, etc.
The various operating parameters (such as output volts, oil pressure, etc.) of the remote generator
can be viewed or changed.
NOTE:- For a single module to PC connection and distances up to 6m (8yds) the USB
connection method is more suitable and provides for a lower cost alternative to RS485 (which
is more suited to longer distance connections).
3.9.5.1 RECOMMENDED PC RS485 SERIAL PORT ADD-ONS
Remember to check these parts are suitable for your PC. Consult your PC supplier for further advice.
• Brainboxes PM154 PCMCIA RS485 card (for laptops PCs)
Set to ‘Half Duplex, Autogating” with ‘CTS True’ set to ‘enabled’
• Brainboxes VX-023 ExpressCard 1 Port RS422/485 (for laptops and
nettop PCs)
• Brainboxes UC320 PCI Velocity RS485 card (for desktop PCs)
Set to ‘Half Duplex, Autogating” with ‘CTS True’ set to ‘enabled’
• Brainboxes PX-324 PCI Express 1 Port RS422/485 (for desktop PCs)
Supplier:
Brainboxes
Tel: +44 (0)151 220 2500
Web: http://www.brainboxes.com
Email: Sales: sales@brainboxes.com
NB DSE have no business tie to Brainboxes. Over many years,our own engineers have used these
products and are happy to recommend them.
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