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Advantage GTx116 Plug & Play Transmitters
Installation & Configuration Guide
Firmware Version 3.xx
Includes analog output models: GTA116-P, GTA116-F & GTA116-B
Includes network output models: GTN116-P, GTN116-F & GTN116-B
GTx116.INSTALLf3.05
Configuration is a Feature, not a requirement on Plug & Play Transmitters
Advantage
by Ebtron
Gold Series
EBTRON
Thermal Dispersion Airflow Measurement
1663 Hwy. 701 S., Loris, SC 29569 USA
Toll Free: 800-2EBTRON (232.8766) Fax: 843.756.1838
Internet: www.ebtron.com e-mail: ebtron@ebtron.com
Metasys and Metasys Compaitble
Product are Trademarks of
Johnson Controls.
Applies to GTN116 only.
LISTED Do not expose the transmitter to rain or snow without providing a NEMA4 enclosure.
Transmitter Installation
The GTx116 transmitter aluminum chassis has been designed for use in a protected environment between -20° F and 120° F where it
will not be exposed to rain or snow.
The transmitter should be mounted upright in a field accessible location. The chassis is designed to accept 3/4 conduit fittings for signal
and power wiring at the top left and right of the enclosure. The transmitter should be located such that the connecting cables from all of
the sensor probes reach the receptacles on the bottom of the transmitter enclosure.
3/4"
5 3/16"
13/16"
3/4"
9 5/16"
8 13/16"
6 11/16"
3/8"
Leave at least 10 inches above, and 2 inches to each side and bottom, of unobstructed space around the transmitter to allow for
heat dissipation and cover removal.
Transmitter Dimensions
1 9/16"
7/8" Dia.
8 13/16"
7/8"
1 1/8"
9 5/16"
Electrical Connections
All Transmitters
After mounting the sensor probes and transmitter, connect one or more sensor probe cable plugs to the circular receptacles located at the
bottom of the GTx116 transmitter enclosure. Probes are plug and play and do not have to be connected to a specific receptacle on the
transmitter. Transmitters can accept GP1, GF1 or GB1 sensors. Mixing sensor types on a single transmitter is not permitted. Match
probes to transmitter by type (A or B) as indicated on the metal tags on the transmitter and sensor probes.
24 VAC power should be connected to the large, two position power input terminal labeled POWER on the upper right hand side of the
main circuit board. Since the output signals are isolated from the power supply, it is not necessary to provide an isolated (secondary not
grounded) power source.
Multiple GTx116 transmitters wired on a single transformer must be wired in-phase.
Do not drill into the transmitter chassis since metal shavings could damage the electronics.
Provide a drip loop at the transmitter if there will be the potential for water runoff or condensation along the sensor probe
cable(s).
Sensor probe cable plugs are keyed. Line up plug with receptacle and push straight on to receptacle. DO NOT TWIST. Press
cable plug ribs towards receptacle when removing. Forcing the cable plug in or out of the receptacle will damage the
connection and void warranty. Output 1 (A)
Output 2 (B)
Common (COM)
Isolated Output Signals
24 VAC Power
Isolation NOT required
Power Switch
Power Fuse
(1.5 Amp Fast Acting)
LCD Display
LCD Contrast
Digital Output Filter
Digital Offset/Gain
Program Keys
Program Port
Output Card
Dual Linear Analog Output GTA116
Field Selectable: 4-20mA or 0-10 VDC
RS-485 Network Output GTN116
Field Selectable: Johnson Controls N2-bus or ModBus-RTU
Sensor Probe Input Connectors
GTx116 Transmitter Wiring and Circuit Board Function Diagram
Analog Output GTA116 Transmitters
To wire the output signal and power, slide the cover plate up and out of the extruded chassis. Make sure that the power switch is in the
OFF position. The GTA116 wiring schematic is shown above. Signal wires for airflow and temperature should be connected to the small,
three position output terminal labeled OUTPUT on the upper left hand side of the main circuit board.
The transmitter is factory shipped with the analog output signals set to the 4-20mA default. If a 0-10 VDC output is desired, simply move
the corresponding switch (SW1 for Output 1, SW2 for Output 2) to the 0-10 VDC position prior to power-up (see figure below). If the output
signal switches are moved after power up, the transmitter must be turned off and then on for the new switch positions to be activated.
Since the accuracy of the GTA116 is percent of reading there should be no need to reconfigure the default output scales listed inside of
the transmitter cover. However, factory default settings can be easily reconfigured in the field (see: Changing Factory Default Settings)
When configured for a 4-20 mA output, the GTA116-P is 4-wire device. The host controls should not provide an excitation
voltage to the output of the GTA116-P.
Output 2 Signal, 4-20mA or 0-10VDC
Output 2 Fuse
Output 1 Fuse
Output 1 Signal, 4-20mA or 0-10VDC
GTA116 Analog Output Card
RS-485 Network GTN116 Transmitters for Johnson Controls N2-bus or ModBus-RTU
To wire the output signal and power, slide the cover plate up and out of the extruded chassis. Make sure that the power switch is in the
OFF position. The GTN116 wiring schematic is shown above. The RS-485 network cable should be connected to the small, three position
output terminal labeled OUTPUT on the upper left hand side of the main circuit board.
Each transmitter must be configured for proper protocol, address, and termination. The transmitter is factory shipped with the protocol
set to the Johnson Controls N2-bus, address 0, and no termination. If the DIP switches are moved after power up, the transmitter must
be turned off and then on for the new switch positions to be activated. DIP switches are located on the output card. The location of the
switches with their settings are indicated in the figures on the next page. 1
In extremely dirty environments, periodic inspection of the sensor element is advised. Carefully remove any excessive buildup of material with compressed air or with a small
brush. Recalibration is not required.
GTN116 RS-485 Network Output Card
Protocol DIP Switch
Address DIP Switch
Termination DIP Switch
Termination
1
2
3
4
off
off
off
off
No Termination
off
on on
off
End of Line
on
off
off
on
Fail-safe Bias
DIP Switch Position
Termination DIP Switch
Protocol
1
2
off
off
JCI N2-bus
off
on
ModBus-RTU
Pos.
Protocol DIP Switch
Address
1
2
3
4
5
6
7
8
off
off
off
off
off
off
off
off
0
off
off
off
off
off
off
off
on
1
off
off
off
off
off
off
on
off
2
off
off
off
off
off
off
on
on
3
:
:
:
:
:
:
:
:
:
on
on
on
on
on
on
on
on
255
Address DIP Switch
DIP Switch Position
Protocol
Physical Interface
Cabling
Interface
Connectors
Topology
Unit Load
"Daisy-chained" multi-drop bus
TECHNICAL DATA
Johnson Controls N2-bus or Modbus-RTU
1/4 (128 devices)
9600 Baud RS-485 Serial, no parity, 8 data bits, 1 stop bit
Twisted shielded pair
Analog and binary input points (registers) for airflow,
dynamic pressure, temperature, and status
Terminal Block
NPT
1
NPA
2
Function
Register
Length
Units
Point Description
Range/Value
Notes
AI
1
04
30001
2
a
FPM
Airflow
0 to 10,000
AI
2
04
30003
2
a
in.w.c.
Differential Pressure
-0.5 to +0.5
GTN116-B Only
AI
3
04
30005
2
a
°F
Temperature
-20 to +160
BI
1
02
10001
1
b
Status
0:OK, 1:Trbl.
Johnson Controls N2-bus
1
Network Point Type
2
Network Point Address
POINT MAP
ModBus-RTU
a
IEEE Floating Point (4 bytes total)
b
Binary (1 byte total)
Setting Transmitter Network Protocol
Transmitter protocol can be changed in the field by setting the DIP switch labeled PROTOCOL on the Network Output Card.
Setting Transmitter Address
Each transmitter must be assigned a unique address between 1 and 255 prior to power up by setting the DIP switch labeled ADDRESS
on the Network Output Card. The least significant bit (LSB) is switch position number 8.
Setting Transmitter Termination
Transmitter termination can be changed in the field by setting the DIP switch labeled TERMINATION on the Network Output Card.
Termination options are No Termination, End of Line, or Fail-safe Bias.
Start-up
When installed in accordance with installation guidelines, no adjustment or calibration is necessary. To assure a successful startup, check
that the airflow measuring station is installed in accordance with this document.
Move the power switch to the ON position. The transmitter executes a complete self-check each time the power is turned on that takes
10 seconds to complete. Check that scaling in the host control system returns an output that matches the output of the GTx116.
The GTA116 is designed to operate on power-up. Default output signals are set to 4-20mA. No field configuration is required. The
GTN116 must be properly configured b