Det-Tronics EA2100CG Eagle 2000 Communication Gateway - Manual (Page 14)

AUXILIARY GATEWAY
Auxiliary gateways are used to connect additional host
devices to the loop for data acquisition purposes.
Additional host devices are not able to modify configu-
ration information for the devices on the loop.
During normal operation, the communication relay for the
auxiliary gateway is closed, creating a communication
pass-through circuit for the communication loop wiring.
Fault isolation is handled by the communication mod-
ules on either side of the auxiliary gateway. If power is
lost to the gateway, a communication pass-through cir-
cuit is created. If an auxiliary gateway does not receive
a time and date broadcast or heartbeat signal from the
main gateway, its communication relay will open and
terminate the loop wiring and it will begin generating the
time and date broadcast and heartbeat signal.
Up to three auxiliary gateways can be used in each
communication loop. The auxiliary gateway with the
lowest address will generate the time and date broad-
cast and heartbeat signal.
FACEPLATE DESCRIPTION
The faceplate provides four RELAY LEDs and one
FAULT LED, a digital display, a bar graph display, and a
reset pushbutton. See Figure 10.
Digital Display
The digital display is a three digit “seven segment” dis-
play. During normal operating conditions, the display
indicates “000.” When a system event occurs (alarm,
fault or calibration), the display sequentially shows the
detector address, followed by detector type, followed by
percent full scale/fault code/calibrate signal.
IMPORTANT
The gateway allows simultaneous use of devices
with various operating ranges. The gateway dis-
play always reads 0 to 100% full scale. If the oper-
ating range of the reporting sensor is anything
other than 0 to 100 units, the gateway display will
indicate a percentage of full scale, not direct engi-
neering units.
Detector Address – All three digits are on and the deci-
mal point for each digit is also on. Up to 250 addresses
are available (displayed 0.0.1. to 2.5.0.).
Detector Type – The first two digits show the detector
type code (Table 1). The third digit displays the detec-
tor range code (Table 2).
Percent/Fault/Calibrate – The display follows the sen-
sor input in percent of full scale up to 100% full scale. A
negative sign is used to indicate a negative zero drift
condition.
A fault condition is indicated as “FXX,” with F indicating
that a fault has occurred and XX identifying the type of
fault that is detected (Table 3).
If a detector is being calibrated, the display will show
“CAL.”
Each indication is shown for 3/4 second, followed by a
1/4 second delay before going to the next indication.
If a single event occurs, the gateway display will lock on
that specific address. If more than one event should
occur, the digital display and bar graph will track the
status of each address where activity is occurring by
sequencing through each event by order of address.
Bar Graph Display
The 20 segment bar graph display tracks the input sig-
nal from the sensor, providing a 0 to 100% full scale
reading of sensor input.
The bar graph display indicates 0 to 100% full scale,
which corresponds to the 4 to 20 ma signal for all gas
sensors except oxygen. The 4 to 20 ma signal from an
oxygen sensor corresponds to 0 to 25% oxygen.
10
RELAY 1
100
90
80
70
60
50
40
30
20
10
RELAY 2
RELAY 3
RELAY 4
FAULT
RESET
RELAY 1 LED
RELAY 2 LED
RELAY 3 LED
RESET PUSHBUTTON
DIGITAL DISPLAY
BAR GRAPH DISPLAY
RELAY 4 LED
FAULT LED
A1542
Figure 10—Gateway Faceplate