Greenheck AMD-xx-TD Transmitter User Manual
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4.5 – POWER/SIGNAL CONNECTIONS (con’t)
OUTPUT #2 (Terminals 3(+) and 4(-), P7).
This output can represent the measured flow (0 - Design
Full Range) or temperature (0 to 140ºF / -18 to 60ºC) and
is sourced (powered) by the Vari-Green. Output can be
configured for 0-5VDC, 0-10VDC, or 4-20mADC. Review
Factory Set-Up Information Sheet for your configuration.
If output is to be 0-5VDC:
Position both jumpers on
J6. See Figure 4.2.
If output is to be 0-10VDC:
Position both jumpers on
J5. See Figure 4.2.
If output is to be 4-20mADC: Position both jumpers on
J7. See Figure 4.2.
In addition to positioning the jumpers for the desired
output type, the corresponding output type must be
selected in the Operator Menu (see Section 5.12).
Network Connection (Terminals 5, 6 & 7, P7).
This serial output is available with optional LonWorks or
BACnet (Version 1.5X only) communication.
For LonWorks, connections are as follows:
Terminal 5 – LonWorks B
Terminal 6 – LonWorks A
Terminal 7 – Ground
Two output variables are provided, flow volume and
temperature.
SNVT
SNVT Index
Measurement
Units
Type Category
Type Size
SNVT_flow_f
53
Flow Volume
Liters/Sec
Floating Point
4 bytes
SNVT_temp_p
105
Temperature
°C x 100
Signed Long
2 bytes
For BACnet, connections are as follows:
Terminal 5 – Net A or Net +
Terminal 6 – Net B or Net -
Terminal 7 – Network Ground
For BACnet objects, see Appendix A.
Set the S1 Termination switches on the BACnet module as follows:
S1 Switch Position
Termination Type
1
2
3
No Termination
OFF
OFF
OFF
End of Line
ON
OFF
OFF
Fail-safe Bias
ON
ON
ON
Note: The Fail-safe Bias termination includes End of Line termination.
4.6 – DISPLAY CONTRAST ADJUSTMENT
To compensate for different ambient lighting conditions and viewing angles, the
Vari-Green display's contrast can
be adjusted for optimum visibility. Contrast is adjusted using potentiometer R13. Turn R13 clockwise to increase
contrast (darken characters relative to background) or counterclockwise to decrease contrast.