Chapter 2:
Connections
RS-232 and RS-422
This DB-9F connector, labeled RS-232/422 on the rear panel of the unit, is used to
remotely control the DPS-475/575 via either RS-232 or RS-422. When this port is in
use, a Unit Address must be set to an appropriate value in the range of 1-127 (see
Chapter 12, “Menus: System Config”). This allows the unit to be used in a multi-drop
configuration where only the unit addressed will respond to remote commands. The
RS-232 port is also used for transferring files to the unit from a Microsoft Windows-
based workstation via custom software (included). See Appendix D for information
on transferring files from a Microsoft Windows system.
Ethernet Port
The 10BaseT Ethernet connector, labeled Ethernet on the rear of the unit, is used to
connect the DPS-475/575 to a TCP/IP-based network for remote control and status
monitoring. Control of the unit is then handled through web-browsing software or an
RC-475 remote control panel. See Appendix F for details of controlling the unit from
your web browser. Ethernet can also be used to control additional DPS-475/575 units
from the front panel of this unit. When using Ethernet, the IP Address, Netmask, and
Gateway settings of the unit must be configured for your network; your network
administrator can provide you with these settings. These settings are located in the
System Config menu, under the Remote Control sub-menu (see Chapter 12, “Menus:
System Config”).
DCN Port
The BNC connector labeled DCN on the rear of the unit is used to provide a DCN
(DPS Coaxial Network) interface for remote control and status monitoring. DCN is a
proprietary network in which 75Ω coax is used as a multi-drop, bi-directional
network. Using a BNC T-connector on the DPS-475/575, loop coax between each
unit and the remote controller (such as the RC-4000 and RC-475). At each end of the
chain, install a 75Ω terminator. Every DPS-475/575 is assigned a unique DCN
address at the factory, so there is no software configuration required. Maximum cable
length (total) in a DCN configuration should be limited to 2000 feet. DCN can also be
used to control additional DPS-475/575 units from the front panel of this unit.
Use with RC-4000 and RC-475
DCN is used to control the unit from an RC-4000 remote control panel. The Search
for devices menu option on the RC-4000 can be used to find all DPS devices attached
to it’s DCN port and configure itself to control them. This may be done for any
number of units at one time. DCN also allows multiple
RC-4000s to control a single DPS-475/575.
It is possible to remotely disable and enable the front panel of the DPS-475/575 from
the RC-4000 using the “KeyLock” option. If this option is not activated, then it is
possible for a local user to modify the remote-user’s settings from the front panel.
However, the RC-4000 will periodically poll the device and show the new parameters
if the local user changes them. If remote control is the usual case, then it is probably
best to disable front-panel access once the device has been installed.
The RC-475 remote control provides an Ethernet port, which permits it to be
conveniently connected to a TCP/IP network. For instructions on using the DPS RC-
475 remote control, please see the RC-475 manual.
For use with the DPS-475/575, the RC-4000 must have firmware version 1.3c or
higher. Note that not all functions of the DPS-475/575 will be accessible through the
RC-4000 remote control.
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