The Liebert OpenComms™ EM is a compact, half-duplex device designed to monitor temperature,
humidity, water detection and contact closure and notify personnel when those conditions exceed
user-defined limits.
The OpenComms EM is available in several models, which vary in size and number and types of
ports. All models have sensor ports to monitor temperature, humidity, water detection and contact
closure, and all models have either an external or built-in temperature/humidity sensor:
• EM
Controller
• EM PDU
Controller
• vEM-14
Controller
Sensor Ports
The OpenComms EM has sensor ports capable of monitoring temperature, humidity, water detection
and contact closure through sensors that may be purchased separately (see Table 3). The unit’s autosensing capability can determine which type of sensor is connected, making the unit ready to plug
into your operation. Default settings for alarm limits may be changed through a Web interface.
Introduction
•has two sensor ports
•ships with an external sensor to detect temperature only (TMNET kit) or
both temperature and humidity (THCMNET kit)
• has no serial ports
• takes up zero U rack space
•has two sensor ports
•ships with an external sensor to detect temperature only (TMPDUNET kit) or
both temperature and humidity (THCMPDUNET kit).
•has two serial ports to monitor Liebert MP Advanced Power Strips
• takes up zero U rack space
•has four sensor ports
• has a built-in temperature and humidity sensor
•has two serial ports to monitor Liebert MP Advanced Power Strips
•has 10 dry contact inputs
• takes up 1U rack space
Ethernet Ports
The unit has an Ethernet port for connection to a network, which provides access to the Web interface
and the capability of receiving alerts when monitored conditions reach alarm status. The
OpenComms EM may also be configured to send e-mail alerts and SNMP traps over the network.
Modem Port
A modem port provides the capability of sending pager messages to notify personnel of alarm conditions in the monitored area.
Web Interface
A Web interface makes it easy to view monitoring data in tabular and graphic formats, configure the
device for alarm thresholds and set up automatic e-mail and pager notifications when a level in a
monitored area crosses a predefined threshold.
Serial Ports (EM PDU / vEM-14 Controllers)
EM PDU and vEM-14 controllers have two serial ports that are ideal for monitoring Liebert Managed
Power (MP) Advanced Power Strips. Power, voltage, current and temperature levels can be monitored
with user-configured alarm thresholds. In addition, some MP Advanced Power Strip models allow
each receptacle on the power strip to be turned on or off through the Web interface.
Typical Applications
An OpenComms EM is highly useful in monitoring:
• Enclosures, particularly those housing electronic equipment such as servers or telephone
switching equipment sensitive to temperature, humidity and power fluctuations
• Process Areas, such as areas where environmentally sensitive chemical reactions occur
• A closet or an area of a room where temperature levels are important, for example, an area
that houses many servers, where you want to verify the area or closet doesn’t get too hot
1
1.1Overview
The OpenComms EM features indicator lights on the front, as shown in Figure 1.
Figure 1Front view (EM PDU & vEM-14 controllers shown)
EM PDU
CONTROLLER
Introduction
Power Link Serial 1 Modem Serial 2 Sensor 1 Sensor
vEM-14
CONTROLLER
2
A - Power and port indicators
(see Table 1)
1.1.1Dimensions and Mounting Overview - EM & EM PDU Controllers
• The unit is 4.75" wide, x 2.5" deep x 1.625" high (120.7 x 63.5 x 41.3mm).
• The unit may be placed on a flat surface or mounted on a wall, using mounting holes on the bottom of the unit. See 2.2.1 - Mounting the Unit on a Wall (EM / EM PDU Controllers) for
more information.
1.1.2Dimensions and Mounting Overview - vEM-14 Controllers
• The unit is 17" wide x 5" deep x 1.75" high (431.8 x 127 x 44.5mm).
• The unit may be placed in a rack-mount or desktop orientation.
2
1.1.3Connectors on Back of Unit
The back of the OpenComms EM, shown in Figure 2, has an input power source, sensor ports, a
modem port and an Ethernet port. The EM PDU and vEM-14 controllers have serial ports, and
vEM-14 controllers also have 10 dry contact inputs.
Figure 2Rear view
Introduction
EM
CONTROLLER
EM PDU
CONTROLLER
vEM-14
CONTROLLER
Sensor 2 Sensor
Modem DCN Ethernet
1
B - SensorsC - Modem
Sensor 2 Sensor
Modem DCN Ethernet
1
B - SensorsC - Modem
D - Serial
devices
Serial 2 Serial
1
D - Serial
devices
E - Ethernet
E - Ethernet
F - Power
F - Power
G - Dry
contact
inputs
F - Power
Table 1Description of indicators and connectors
ItemDescriptionFor more information, see:
A - Power and
port indicators
B - Sensors
C - Modem
D - Serial
devices
E - Ethernet
F - Power
G - Dry
contact inputs
Indicators on the front of the unit show the status of input power
and other connections (see Figure 1).
Sensor ports to connect compatible sensors:
• Temperature sensor
(provided with TMNET & TMPDUNET kits)
• Temperature & humidity combination sensor
(provided with THCMNET & THCMPDUNET kits)
• Humidity, water detection or dry-contact sensor
(available separately)
Port for connection to a modem.
• Requires RJ45 cable (customer-supplied)
Serial 1 and Serial 2 ports to connect serial devices
(EM PDU and vEM-14 controllers).
• Requires serial cable (one provided)
Port for connection to an Ethernet network.
• Requires RJ45 cable (customer-supplied)
Power connection for the OpenComms EM.
• Requires 9VDC
10 dry contact inputs for auxiliary devices (vEM-14 controller).
• Requires Form C dry contacts
1.2:Indicators
2.3.4: Connect Sensors
5.3:Sensors Window
2.3.3: Connect to a Modem
2.3.5: Connect Serial Devices
(EM PDU/vEM-14 Controllers)
5.4:Power Window (EM PDU &
vEM-14 Controllers)
5.7.4: Serial Ports
2.3.2: Connect to an Ethernet Network
5.7.1: Network Connectivity
2.3.1: Connect Power to the Unit
—
3
1.2Indicators
The front of the OpenComms EM has indicators that show input power to the unit and the status of
various connections, as shown in Figure 3 and described in Table 2.
Figure 3Indicators on front of unit
EM CONTROLLER
Power Link Activity Sensor 1 Sensor
EM PDU CONTROLLER
Introduction
2
Power Link Serial
1
vEM-14 CONTROLLER
2
Modem Serial
Sensor 1 Sensor
2
Table 2Indicators summary
Indicator
Type
PowerPowerPowerOnRedPower is connected and powering the OpenComms EM.
EthernetLinkLinkCx/TxYellowThe OpenComms EM is connected to an active network.
Sensor
port
Serial
port*
Indicator Label on Model:
ColorDescriptionEMEM PDUvEM-14
Sensor 1Sensor 1Sensor 1GreenA sensor is connected to the Sensor 1 port.
Sensor 2Sensor 2Sensor 2GreenA sensor is connected to the Sensor 2 port.
——Sensor 3**GreenA sensor is connected to the Sensor 3 port.
——Sensor 4**GreenA sensor is connected to the Sensor 4 port.
—Serial 1Serial 1GreenA device is connected to the Serial 1 port.
—Serial 2Serial 2GreenA device is connected to the Serial 2 port.
ModemActivityModemMdmGreenA modem is connected.
* EM PDU and vEM-14 controllers
** vEM-14 controllers
4
2.0INSTALLATION
This section provides instructions for installing, mounting and connecting power and other cables to
the OpenComms EM.
2.1Installation Considerations
The OpenComms EM must be installed indoors where electrical service is available. The unit should
be placed where it can be easily accessed for connecting the unit to a modem, a computer or a network
hub and, if used, serial devices.
The unit may either be mounted on a wall or be placed on a surface, depending on the user’s application and the location of equipment to be connected and monitored. Consider the length of the sensor
cable and the distance to the monitored area when deciding where to place the OpenComms EM,
whether you use the 1-ft. (0.3m) cable provided with the unit or the optional 15-ft. (4.6m) cable that
may be purchased separately.
2.1.1Unpacking and Preliminary Inspection
• Before unpacking the OpenComms EM, inspect the shipping carton for damage or signs of mishandling, such as gashes or holes in the carton or severely flattened corners.
• Open the shipping carton carefully. Use care to avoid puncturing the container with sharp objects
that might damage the contents.
• Inspect the OpenComms EM and all included components for damage. See Table 3 for a list of
items that should be included with each model.
• If any damage from shipping or mishandling is observed, immediately file a damage claim with
the shipping agency and forward a copy to:
Table 3Standard and optional components shipped with OpenComms EM
Kit Part Number
STANDARD COMPONENTS (Shipped With Kits)
• EM Controller - 2 sensor ports✔✔ ———
• EM PDU Controller - 2 sensor ports, 2 serial ports——✔✔—
• vEM-14 Controller - 4 sensor ports, 2 serial ports————✔
• CD with software and user manual✔✔ ✔✔✔
• Power supply✔✔ ✔✔✔
• Quick-start guide✔✔ ✔✔✔
• Temperature sensor, 1 ft. (0.3m)✔—✔——
• Temperature & humidity combination sensor,
1 ft. (0.3m)
• Built-in temperature and humidity sensor————✔
• Serial cable for MP Advanced Power Strips,
5 ft. (1.5m)
OPTIONAL COMPONENTS (May be Purchased Separately)
• Contact closure cable, 15 or 100 ft. (4.6 or 30.5m)• Humidity sensor, 15 or 60 ft. (4.6 or 18.3m)
• Water detection sensor, 15 or 60 ft. (4.6 or 18.3m)• Temperature sensor, 15 or 60 ft. (4.6 or 18.3m)
• Serial cable for MP Advanced Power Strips,
10 ft. (3m)
TMNETTHCMNETTMPDUNETTHCMPDUNETvEM-14
—✔—✔—
——✔✔—
• Temperature & humidity combination sensor,
15 or 60 ft. (4.6 or 18.3m)
5
2.2Decide on Placement of the OpenComms EM
The unit may either be placed on a level surface or mounted on a wall, depending on the user’s application and the location of equipment to be connected and monitored. vEM-14 controllers may also be
mounted in a rack.
• If placing the unit on a level surface, such as a shelf or a desk, proceed to 2.3 - Make Connec-tions.
• For wall or rack mounting, see the appropriate section for your model:
• 2.2.1 - Mounting the Unit on a Wall (EM / EM PDU Controllers)
or
• 2.2.2 - Mounting the Unit on a Wall or in a Rack (vEM-14 Controllers)
2.2.1Mounting the Unit on a Wall (EM / EM PDU Controllers)
The bottom of the EM / EM PDU controller has two holes to accommodate screws to secure the unit to
a wall, either horizontally or vertically. You will need a screwdriver and any screws or bolts that will
fit in the slots on the bottom of the unit.
1.Mark the wall for the mounting holes 1-3/4" (44.5mm) apart (see Figure 4).
2.Drill holes, if required, to install the two screws that will secure the unit to the wall. Clean up the
debris.
3.If the wall material is not strong enough to hold the screws securely, use wall anchors.
4.Install the two screws—the screw heads must be small enough to slip through the larger, bottom
portion of the mounting slot in the OpenComms EM (see Figure 4). The screws must also be
large enough to extend over the edges of the top of the mounting slot.
5.Tighten the screws until they will hold the OpenComms EM tightly to the wall.
6.Hang the OpenComms EM on the screws, pushing the unit down until the screws are in the
smaller, upper portion of the slot.
7.Proceed to 2.3 - Make Connections.
Installation
Figure 4Mounting dimensions - EM / EM PDU Controllers
1-3/4"
(44.5mm)
horizontal mounting
1-3/4"
(44.5mm)
vertical mounting
6
2.2.2Mounting the Unit on a Wall or in a Rack (vEM-14 Controllers)
The vEM-14 controller may be mounted on a wall or in a rack, such as the Liebert Foundation. The
unit has four holes on each side, as shown in Figure 5.
Figure 5Mounting - vEM-14 Controllers
Installation
REAR OF
UNIT
After determining where to place the unit, check to ensure that you have all the hardware required to
install the unit in a rack.
Obtain the needed tools and material. You will need these items for wall or rack mounting:
Follow the instructions below for either Wall Mounting or Rack Mounting.
Wall Mounting
The vEM-14 controller has four holes on each side to accommodate various ways of attaching the
brackets (see Figure 5).
The brackets can be installed facing up or down for wall mounting.
1.Mark the wall for the mounting holes 1-3/4" (44.5mm) apart (see Figure 5).
2.Drill holes, if required, to install the screws that will secure the unit to the wall. Clean up the
3.If the wall material is not strong enough to hold the screws securely, use wall anchors.
4.Install the screws and tighten until they will hold the brackets tightly to the wall.
5.Hang the unit on the brackets.
6.Proceed to 2.3 - Make Connections.
Holes for rear mountingMounting brackets
Holes for front mounting
• Brackets for rack mounting - 2 (provided)
• Screws to attach brackets - 4 (provided)
• Phillips screwdriver
debris.
FRONT
OF UNIT
Rack Mounting
The vEM-14 controller has four holes on each side to accommodate various ways of attaching the
brackets (see Figure 5). The unit may be front- or rear-mounted, and it can fit into a 19" or 23" rack.
The brackets can be installed facing forward or toward the rear for rack mounting.
1.Decide whether the unit will be front- or rear-mounted. Use the longer side of the bracket for a 19"
rack; use the shorter side of the bracket for a 23" rack:
2.Attach the bracket using two screws at front of unit for front mounting. For rear mounting, use
holes at rear of unit. Attach the second bracket on the other side.
3.Slide the unit into the rack and secure the brackets to the frame (mounting hardware not
included).
4.Proceed to 2.3 - Make Connections.
7
2.3Make Connections
All ports are on the back of the OpenComms EM. The port placement and port labels differ for each
model. Refer to Figure 2 for your model.
2.3.1Connect Power to the Unit
• Connect the DC power adapter to the DCN/Power port on the back of the OpenComms EM, as
shown in Figure 2. When power is connected, the Power indicator on the front is ON (red).
2.3.2Connect to an Ethernet Network
• Connect a straight-through CAT5 Ethernet cable from your 10 Mbit network to the Ethernet/ETH
port on the back of the OpenComms EM (see Figure 2).
• When the unit is connected to an active network, the Link/Cx indicator on the front is ON (green).
2.3.3Connect to a Modem
• If using a modem, connect an RJ45 cable from a modem to the Modem port on the back of the unit
(see Figure 2). Also refer to 6.1 - Modem Setup and Pinout Guide.
• When the unit is connected to a modem, the Activity/Modem/Mdm indicator on the front is ON
(green).
2.3.4Connect Sensors
Use a sensor—temperature, humidity, combination temperature & humidity or water detection (see
Table 3)—or a contact closure cable (see 6.2 - Contact Closure Cable Pinout Guide).
Installation
For a contact closure cable, the orange/white and white/orange wires must be tied together to form the
common. The blue/white wire is the contact that may be defined as either Normally Open or Normally
Closed.
• Connect a sensor or contact closure cable to any sensor port—for example, Sensor 1—shown in
Figure 2. These connections may be made in any order; the ports are identical and are configured
to accept and recognize all types of sensors.
• When a sensor or contact closure cable is connected properly to any sensor port, the corresponding
Sensor indicator on the front is ON (green).
2.3.5Connect Serial Devices (EM PDU/vEM-14 Controllers)
Use the serial cable provided with EM PDU controllers (available separately for vEM-14 controllers),
or see 6.3 - Serial Cable Pinout Guide (EM PDU & vEM-14 Controllers).
• Connect the six-wire end of the serial cable into the RS232 port of an MP Advanced power strip.
• Connect the other end (eight-wire) of the serial cable to either serial port (Serial 1 or Serial 2) of
the OpenComms EM, shown in Figure 2.
• When a cable is connected properly to either port, the corresponding Serial 1 or Serial 2 indicator
on the front is ON (green).
8
3.0ASSIGNAN IP ADDRESS
After connecting the OpenComms EM device to your network, the next step is to identify the device to
the network by assigning an IP address.
Consult Your Network Administrator
Consult your network administrator to obtain an IP address that is appropriate for your network, as
well as a subnet mask and default gateway address. When your device is assigned a new IP address,
it is saved in the Electrically Erasable Programmable Read-Only Memory (EEPROM), meaning the
unit will retain its IP address even after power is recycled.
Select a Method
There are three methods of assigning the IP address, as listed in Table 4, depending on your network’s method of assigning IP address (static or dynamic) and your computer’s operating system (OS).
The IPSET.exe program is included on the CD that came with your unit.
Select a method and refer to Table 4 to determine which instructions to follow.
Table 4Methods of assigning IP addresses
MethodRecommended for:Follow instructions in:
IPSET.exe
program
ARP
command
DHCP
Network that uses static IP addresses; computer with Windows operating
system (shipped with unit)
Network that uses static IP addresses; computer with Windows or other
operating system
Network that uses Dynamic Host Configuration Protocol (DHCP), where
IP addresses are assigned dynamically
Assign an IP Address
3.1 - Use IPSET.exe to
Assign an IP Address
3.2 - Use ARP to
Assign an IP Address
3.3 - Use DHCP to
Assign an IP Address
3.1Use IPSET.exe to Assign an IP Address
If your network uses static IP addresses and your computer has a Windows operating system, you
may use the IPSET.exe program included on the CD that came with your unit.
NOTE
These steps must be done on the same network segment where the OpenComms EM is connected.
To do this:
1.Insert the OpenComms EM CD in the CD
drive.
2.Click on the Start button, then on Run.
3.In the Run window, click on Browse to
locate the file IPSET.exe on the CD,
highlight the file name and click Open.
4.In the Run window, click OK. The IPSet
window opens, as shown at right.
5.In the IP address box in the Target area,
enter the IP address for your unit.
Note: The IP address must be unique on the
network—not assigned to any other device.
6.Enter the Subnet Mask of your network in the Subnet box. (Depending on your IP address, some
or all of the Subnet Mask might be entered automatically after you enter the IP address.)
7.Enter the default gateway address in the Default box.
8.In the MAC address box, enter the MAC address of your device.
Note: The MAC address is found on a sticker on the bottom of the device.
9.Click on the Apply button. If the device identification is successful, the message “Successfully set
IP address” appears in the Status box. (If not, the message “No response from target” appears in
the Status box.)
10. Click on the Close button and proceed to 4.0 - Web Interface Overview.
Enter a
unique
IP address
Subnet
mask
Default
gateway
address
Enter the unit’s
MAC address
(look on
bottom of unit)
Apply button
9
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