Eaton POWERWARE Plus 18, Manual

Page: 92 / 311

Plus 18
Circuit Board
a negative DC source (-12 The Volts’ is used by IC interface
IC and the U6, The plus and minus 12
Volt sources are by the RS-232 driver, and the Relay Interface
isolated chassis the common
for all of the on
this board. The volts and ground are used to power the Relay
Relay Drivers
signals sent from the panel board to this board via These signals
relays.
the output of the 7407 leaves the relay contact to
COMMON). When a is applied to the receiver’s the relay is energized.
Diodes DS-8 are for the relay coils to prevent an overvoltage on
the outputs of the 7407 when the relays are de-energized The each have
C” contacts the via the 26 Pin Header
In order
to maintain backward compatibility. pin 8 of the 26-pin 17 of DB-25)
can be programmed to be either N.O. or N.C. via plug The relays
provide and meet
the. Relay interface to various Relay NOVELL,
etc., as as configurations.
RS-232 Signals
capability.
microprocessor on the panel. The handshake is sour& from and
controlled by the handshake line RTS. is an input to the
unused lines and
sre brought onto the board and tied to a voltage which asserts ready state of
DSR is an unused output. of the handshake
lines DTR. and is for of future
5.8.4
AS400
The
rnicropr is a CMOS 8-Bit which is baaed on the
is a one-time programmable part and the 1 is a
mask The of Relay 1 Relay 4 is read from the
the alarm to the RS-422 The CMOS RS-422 driver sends out a baud bit
ELECTRONICS CONFIDENTIAL