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EBTRON • 1663 Hwy. 701 S., Loris SC 29569 • Toll Free: 800.2EBTRON (232.8766) • Fax: 843.756.1838 • Internet: EBTRON.com
G
OLD
S
ERIES
GTC116 T
RANSMITTER
a measurable difference!
EBTRON
IG
_GTC
116_R
3
A
4
GTC116
ANALOG
OUTPUT
AND
NETWORK
CONNECTIONS
This
section
contains
analog
and
network
output
wiring
instructions
for
the
GTC116
transmitter
with
RS
‐
485
and
Dual
Analog
outputs.
4.1
GTC116
‐
ANALOG
OUTPUT
WIRING
Analog
output
connections
are
made
at
the
top
left
of
the
transmitter
main
circuit
board
OUTPUT
connector
as
shown
in
Figure
6.
Independent
linear
analog
outputs
are
provided
for
airflow
at
OUTPUT
terminal
1,
and
for
temperature
(or
alarm)
at
OUTPUT
terminal
2,
each
with
over
voltage
and
over
current
protection.
Airflow
and
temperature
outputs
are
field
selectable
for
either
0
‐
5/0
‐
10VDC
or
4
‐
20
mA.
The
OUTPUT
terminal
2
can
be
assigned
as
an
Alarm
output
to
provide
an
active
high,
active
low
or
trouble
alarm
output.
Outputs
are
galvanically
isolated
from
the
main
power
supply
to
permit
simple
integration
with
virtually
all
building
automation
systems.
When
configured
for
4
‐
20mA
output,
the
GTC116
is
a
“4
‐
wire”
device.
The
host
controls
shall
not
provide
any
excitation
voltage
to
the
output
of
the
GTC116.
For
the
analog
outputs,
shielded
cable
is
recommended.
To
wire
the
analog
outputs,
slide
the
cover
plate
up
and
off
of
the
enclosure.
Ensure
that
the
power
switch
is
in
the
“OFF”
position.
Connect
signal
wires
for
airflow
rate
and
temperature
(or
alarm)
to
the
small,
three
position
output
terminal
labeled
“OUTPUT”
on
the
upper
left
hand
side
of
the
main
circuit
board
as
shown
in
Figure
6.
Figure
6.
GTC116
Combination
Analog/RS
‐
485
Transmitter
Interior
Detail
ON
OF
F
OFF ON
ESC
ENTER
CONTRAST
REPLACE WITH
1.5 AMP
FAST ACTING ONLY
OUTPUT
1 2 COM
POWER
24VAC IN
L2 L1
ON
OFF
RS-485
NET COM
NET -
NET +
ON
TERM
F1
F2
VDC mA
OUT 1
OUT 2
RS-485
ANALOG OUTPUT
1: Airflow
2: Temperature/Alarm
COM: Common
(RS-485 output below)
Transmitter Status LED
(Green 1 second flash normal;
2 second flash for trouble)
Combination Analog/
RS-485 Output Card
P.N. 800-1825
Analog Output Fuses
F1=OUT1
F2=OUT2
UL Listed 0.125 Amp
P.N. 800-1105 (Qty:10)
NET COM*
NET -
.
NET +
RS-485
OUTPUT
(For Analog Output, see
separate output above)
Power Switch
LCD Display
SW1 (for OUT1)
Airflow Output Signal Select
SW2 (for OUT2)
Temp./Alarm/Trouble Output
Signal Select
VDC: 0-5/0-10VDC or
mA: 4-20 mA
RS-485 Activity LED
(Green LED indicating RS-485 network activity)
*CAUTION
The common for the ANALOG and the RS-485 outputs must be at the same potential.
For ISOLATED RS-485 output, COM connection MUST BE CONNECTED to network common.
For NON-ISOLATED output, COM connection MUST BE CONNECTED to the common ground that other network devices are using (typically the
ground side of the 24VAC supply - L2 of the POWER terminals). Refer to RS-485 Network Wiring Connections paragraph for additional detail.
off
off
off
off
No Termination
off
off
End of Line
off
off
Fail-safe Bias
!
!
SW3 TERMINATION Switch
