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MX28B1200/2400 MX28B1200/4800 –48 VDC User’s Manual Page 24
The DB9 connector on the top right hand side of the unit, behind a blank panel directly above
the controller, uses the special RS-232 cable (APC part number 940-0024C) to allow local
access through a Terminal Emulation program like HyperTerminal™ or Procomm™ .
RJ45 Ethernet Connector
The optional management card, which is behind a blank panel directly above the controller, has
an RJ-45 connector to support a TCP/IP protocol over a 10BaseT Ethernet Local Area Network
(LAN).
Relay Output Connections
There are eight alarms available that provide outputs via Form “C” relay contacts. The last two
of these are pre-assigned as the Minor and Major relay outputs. The Major relay is energized
(NO-C contacts closed) during normal (non-alarm) operating conditions; all the other relays
energize when an alarm condition occurs. The other six outputs are initially designated as
“Relay 1” through “Relay 6” (the user may assign more meaningful names if desired). The
various system alarm conditions can be assigned to any of the eight alarm outputs. There are
three sets of Wago connectors on the interface card. Two are for Output Relays and one is for
Input Relays. To attach the Output Relay wires, push down on the white spring-loaded lever;
Insert the wire and release the lever. Refer to the board layout in Figure 3.9-1 for Output Relay
connections. The relay contacts should only be used to switch resistive loads of 0.5 amperes or
less at 60 volts or less. The following shows the alarm output connection designations.
Figure 3.9-1 Interface Board