7
ALARM RELAY (J9)
The Annunciator provides a relay with both a Normally Open con-
tact and a Normally Closed contact. This relay is energized when
DC power is provided to the Annunciator so that in the event power
to the Annunciator fails the relay contacts will change state. When
the Audible alarm is activated this relay will be de-energized.
RS485 LINE TERMINATION RESISTOR
A 1000 ohm RS485 terminating resistor is installed on the Remote
Annunciator PC board via a 3-position jumper (JMP1 in Figure 2).
In most applications this 1000 ohm terminating resistor is con-
nected and the jumper (JMP1) is in the closed or 1-2 position. This
jumper can also be moved to the open or 2-3 position.
GRAPHICAL USER INTERFACE (GUI)
A DB9 connector is provided on the Annunciator Control Board for
use in setting the Annunciator functions. A GenLink serial cable
(P/N 0F7707) should be used to connect a laptop computer’s
RS232 serial port to the Annunciator DB9 connector. The GenLink
cable is a Null-Modem style serial cable with female-to-female
DB9 connectors.
Shown in Figure 12 is a typical Windows GUI interface as it
appears on the computer display.
RS485 COMMUNICATIONS
In a typical application, the Annunciator monitors (i.e. slave mode)
the Generator control system via the RS485 communication line.
SERIAL INTERFACE
Baud Rate
Auto-Detect 57.6K, 38.4K, 9600
or 4800 (No Parity, 2 Stop Bits)
COMMUNICATIONS CONNECT TIME
When an Annunciator is powered up onto an existing RS485
network, there will be a period of time, during which the unit may
report a “ communication failure” . During this time the Annunciator
is searching for the correct Baud rate. The Annunciator will typi-
cally communicate within one minute after being connected.
Remote Annunciator
Figure 12 — Annunciator GUI Interface Display
