Assembling the system

In this section we describe how to assemble the system and install power and communication cables between Data Acquisition Modules (DAqMs), Data Retention Modules (DRMs), and the SmartFlux 2 or 3 System. Your exact setup may differ a little from what is described here, depending on the components purchased.

Initial assembly

The basic assembly instructions are given here.

Installing the system power supply cable

Connect the main power supply conduit to the small opening in the enclosure. Orient the lock-nut teeth so that they make contact with the enclosure surface. Connect the main power supply wires to terminals 3, 4 and 5.

As a good practice, be sure that your power cable is not connected to a power source until the wiring is complete. Keep the breakers in the OFF position until you are ready to power up the system.

**Table 2‑1**. Power wire connections for the main power supply to the enclosure.
From	Wire Color	To
Main power (-)	black	DIN Terminal 3 (bottom)
Earth ground	green	DIN Terminal 4 (bottom)
Main power (+)	red	DIN Terminal 5 (bottom)

Installing strain relief couplings

Three strain relief couplings fit into the openings in the bottom of the enclosure. Orient the lock-nut teeth so that they make contact with the enclosure surface.

Installing system power supply wires

Install the wire leads from the accessories kit. These distribute power from the breakers to the DIN terminals.

**Table 2‑2**. Power wires that connect the main power input to breakers and terminals.
From	Wire Color	To
DIN Terminal 3 (top)	black	DIN Terminal 18 (bottom)
DIN Terminal 4 (top)	green/yelllow	Ground lug
DIN Terminal 7 (top)	red	Right breaker (bottom)
Left breaker (top)	red	DIN Terminal 16 (top)
Right breaker (top)	red	DIN Terminal 22 (top)

Installing the backup battery

If you do not have the backup battery, skip this step. The backup battery, in combination with the DRM, will continue to power some components while powering off others by activating or deactivating switched power supplies if the main power supply goes down. The DRM charges the backup battery during normal operation.

The battery is to be installed under the DAqM plate, between the two risers. The cable has a connector with bare leads that connect to the DRM. Begin by connecting the bare leads to the DRM. To prevent the battery from becoming discharged, leave the connector disconnected until you are ready to deploy the system.

From	Wire Color	To
Backup battery	black	DRM POWER IN GND
Backup battery	red	DRM POWER IN +12V BAT

Installing the DRM and DAqM

The DAqMs and DRM should be mounted to the DIN rails on the left side of the enclosure. The SmartFlux System and network switch should be mounted to the upper DIN rail on the right side of the enclosure.

Preparing the SmartFlux System and network switch

Follow the steps below when installing the SmartFlux System in the 7900-050 Eddy Covariance System Enclosure or 7900-126 Biomet Data Acquisition System Enclosure. If you are using a different enclosure, connect the power and data cables similarly to what is described here.

Install the USB drive

Data are recorded to the USB drive. Install the USB drive in the USB port on the SmartFlux System.

Connect the GPS antenna cable

Route the GPS cable through the left opening at the bottom of the enclosure and plug it into the GPS port on the SmartFlux System.

Connect power wires and the Ethernet cable to the SmartFlux System

Connect wire leads to the positive and negative terminals on the SmartFlux System. The black lead connects to negative (-), the red lead connects to positive (+). Plug in the 30 cm Ethernet cable that came with the SmartFlux System. There are two connections for positive (+) and two for negative (-). Use only one pair of +/- terminals.

Connect power wires to the Brainboxes network switch

Power wires connect to the positive and negative terminals on the switch. The black lead connects to terminal 1 (-), the red lead connects to terminal 2 (+).

Installing the SmartFlux System and network switch

Install the SmartFlux 2 or 3 System onto left side of the upper-right DIN rail. Insert the spring-loaded clip on the bottom edge of the DIN rail and compress the spring. Rotate it into place. Mount the switch next to it.

Installing power and ground wires for components

With the 7900-126 enclosure, each component is powered individually from the power supply terminals, the DC-DC converter, or the DRM power outputs. 24-volt and 12-volt power supplies will be wired differently.

Caution: Do not short circuit the power supplies. For example, avoid connecting the V₄ POWER OUT terminals from a Data Retention Module to the Power In terminals on a device that is powered from another power supply. Doing so will damage components and may present risk of a fire.

Select the power supply option that describes your system:

24 VDC power supply with Data Retention Module. This configuration uses the 24 volt output from a SunWize solar power supply. The DRM provides voltage regulation for devices that are not compatible with the 24 volt power supply.
12 VDC power supply with Data Retention Module. With a 12 volt power supply, no voltage regulator is needed.
12 VDC power supply with no Data Retention Module. With a 12 volt power supply, no voltage regulator is needed.
24 VDC power supply with the TDK-Lambda DC-DC converter. With a 24 volt power supply and no Data Retention Module, the TDK-Lambda voltage regulator should be used to power devices that have maximum power supply limits lower than 24 VDC.

24 VDC power supply with Data Retention Module

**Table 2‑3**. Power wire connections for a system powered by a 24 VDC supply that includes a Data Retention Module.
From	Wire Color	To
DRM and DAqM Ground Lugs	yellow/green	Enclosure Ground Lug
DIN Terminal 1 (top)	black	DRM POWER IN GND (-)
DIN Terminal 5 (top)	red	DRM POWER IN +9-30 VDC (+)
DRM V₁ Power GND	black	DAqM 1 GND (-)
DRM V₁ Power +12V₁	red	DAqM 1 PWR (+)
DRM V₂ Power GND	black	DAqM 2 GND (-)
DRM V₂ Power +12V₂	red	DAqM 2 PWR (+)
DRM V₃ Power GND	black	DIN Terminal 12 (bottom)
DRM V₃ Power +12V₃	red	Left Breaker (bottom)
DRM V₄ Power GND	black	SmartFlux System (-)
DRM V₄ Power +12 V₄	red	SmartFlux System (+)
DIN Terminal 12 (top)	black	Network Switch (-)
DIN Terminal 15 (top)	red	Network Switch (+)
DIN Terminal 11 (top)	black	Cellular/Satellite Modem (-)
DIN Terminal 13 (top)	red/white	Cellular/Satellite Modem (+)

**Table 2‑4**. Power wire connections for a system powered by a 12 VDC supply that includes a Data Retention Module.
From	Wire Color	To
DRM and DAqM Ground Lugs	yellow/green	Enclosure Ground Lug
DIN Terminal 11 (bottom)	black	DRM POWER IN GND (-)
DIN Terminal 13 (bottom)	red	DRM POWER IN +9-30 VDC (+)
DRM V₁ Power GND	black	DAqM 1 GND (-)
DRM V₁ Power +12V₁	red	DAqM 1 PWR (+)
DRM V₂ Power GND	black	DAqM 2 GND(-)
DRM V₂ Power +12V₂	red	DAqM 2 PWR (+)
DRM V₄ Power GND	black	SmartFlux System (-)
DRM V₄ Power +12 V₄	red	SmartFlux System (+)
DIN Terminal 12 (top)	black	Network Switch (-)
DIN Terminal 15 (top)	red	Network Switch (+)
DIN Terminal 11 (top)	black	Cellular/Satellite Modem (-)
DIN Terminal 13 (top)	red/white	Cellular/Satellite Modem (+)

**Table 2‑5**. Power wire connections for a system powered by 12 VDC with no Data Retention Module.
From	Wire Color	To
DRM and DAqM Ground Lugs	yellow/green	Enclosure Ground Lug
DIN Terminal 11 (bottom)	black	DAqM GND (-)
DIN Terminal 13 (bottom)	red	DAqM PWR (+)
DIN Terminal 11 (top)	black	SmartFlux System GND (-)
DIN Terminal 14 (top)	red	SmartFlux System (+)
DIN Terminal 12 (top)	black	Network Switch (-)
DIN Terminal 15 (top)	red	Network Switch (+)
DIN Terminal 11 (top)	black	Cellular/Satellite Modem (-)
DIN Terminal 13 (top)	red/white	Cellular/Satellite Modem (+)

**Table 2‑6**. Power wire connections for a system with the TDK-Lambda DC-DC converter.
From	Wire Color	To
DRM and DAqM Ground Lugs	yellow/green	Enclosure Ground Lug
DIN Terminal 2 (top)	black	TDK-Lambda Input 1 (-Vi)
DIN Terminal 6 (top)	red	TDK-Lambda Input 2 (+Vi)
TDK-Lambda Output 3 (COM)	black	DIN Terminal 12 (bottom)
TDK-Lambda Output 4 (+V1)	red	Left Breaker (bottom)
DIN Terminal 11 (bottom)	black	DAqM GND (-)
DIN Terminal 13 (bottom)	red	DAqM PWR (+)
DIN Terminal 11 (top)	black	SmartFlux System GND (-)
DIN Terminal 14 (top)	red	SmartFlux System (+)
DIN Terminal 12 (top)	black	Network Switch (-)
DIN Terminal 15 (top)	red	Network Switch (+)
DIN Terminal 11 (top)	black	Cellular/Satellite Modem (-)
DIN Terminal 13 (top)	red/white	Cellular/Satellite Modem (+)

Installing data cables

Communication is handled through RS-485, SDI-12, and Ethernet cables.

Connecting RS-485 data cables

Each DRM and DAqM has RS-485 terminals labeled as DATA IN and DATA OUT. Although the communication is bidirectional, the labels describe the "flow" of readings through the unit toward the SmartFlux System. DATA IN receives biomet data from a DAqM. DATA OUT sends biomet data to a DRM, DAqM, or the SmartFlux System.

**Table 2‑7**. Data cable wiring for DRMs and DAqMs.
From DATA OUT	Wire Color	To DATA IN or SmartFlux System
TX-	white/green	RX-
TX+	green	RX+
RX-	white/yellow	TX-
RX+	yellow	TX+
RTN	black	RTN or Signal Return

For a DRM and one or more DAqMs

Data cables for a system with two DAqMs are installed as shown in Figure 2‑7.

For a solitary DAqM

The data cable for a system with one DAqM and no DRM is installed as shown in Figure 2‑8.

Connecting SDI-12 data wire leads

Red, blue, and black wire leads connect the SDI-12 terminals to the to the DIN terminals.

**Table 2‑8**. SDI-12 terminals from one DAqM to DIN terminals.
From	Wire Color	To
SDI-12 DAT	blue	DIN Terminal 8
SDI-12 GND	black	DIN Terminal 9
SDI-12 12V	red	DIN Terminal 10

Connecting network data cables

Network cables connect the SmartFlux System and gas analyzer to the network switch. Vacant ports on the network switch are for other networked components, PhenoCam, LI-7700, or connecting a PC. If you have an RV50X cellular modem, leave its Ethernet cable disconnected until you are done configuring the instrument network.

Connecting PhenoCam data and power cables

Note: The StarDot NetCam SC (PhenoCam) has been replaced by a new model - the NetCamLIVE2. The NetCamLIVE2 is a direct replacement and is supported by SmartFlux 2 and 3 Systems (firmware v2.4.2 and newer).

The PhenoCam data cable connects to the network switch. The power wires connect to terminals in the enclosure.

From	Wire Color	To
PhenoCam Power (GND)	black	Terminal 11
PhenoCam Power (+12 VDC)	red	Terminal 14

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