Because RFL™ and Hubbell® have a policy of continuous product improvement, we reserve the right to change designs and specifications without notice.
3.1.2 DACS MODULE FUNCTIONAL DESCRIPTION
3.1.2.1 PORT SETTINGS
There are a number of configuration settings that may be varied on a port-by-port basis. It should be
noted, however, that not all settings are compatible with all DACS module global configuration
settings.
3.1.2.1.1 PORT MODES
There are several basic port modes of operation that each port may be set to. The most basic port
mode is “Off” which has the ability to turn a port off if it is not being used. This will ignore any
problems associated with the port.
The most basic operational port mode is “Plain”. This mode makes the port fully functional, but does
not enable any handshaking functions. This is useful in some non-switching applications such as
point-to-point and linear systems and during commissioning and debug of networks.
In order to obtain network break recoveries the outward ports should be set to “Handshake” mode.
One of the primary functions of this mode is to ensure that both nodes facing a network break, know
that a break has occurred, even if it is a unidirectional break that only interrupts traffic to one of the
two nodes.
Another port mode is “CM” (common module). This mode is used on ports 5 and 6 only when the M-
DACS is used in a loop configuration with one or more of the DACS modules in ILS mode. It is
assumed that there is no logical way to break this local connection, so a failure on this port indicates a
node failure. To ensure that the nodes on either side of the DACS know that the node has failed, all
network facing ports broadcast a bursting all ones signal.
Refer to the table in paragraph 7.7.1.11 for more information on the port modes.
M-DACS-T1 RFL Electronics Inc.
October 25, 2004 3-4 (973) 334-3100
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