Emerson Make Connections, Make These Connections, Rear view - OpenComms EM ports, Link/Cx

MAKE CONNECTIONS

The OpenComms EM must be installed indoors where electrical service is available. The unit should be placed where it can be easily accessed for making connections. It may be placed on a flat surface or mounted on a wall (see the user manual for mounting instructions). Consider the length of the sensor and other cables and the distance to the monitored area when deciding where to place the unit.

Refer to Figure 1 when making the connections in Steps 1 - 5 below to the ports on the back of the OpenComms EM. The port placement and port labels differ for each model.

Figure 1 Rear view - OpenComms EM ports

		Sensor Sensor		Modem Ethernet DCN
EM	2		1				Power
CONTROLLER
Rear of unit
					Serial
	Sensors		Modem			Ethernet
					devices

EM PDU CONTROLLER Rear of unit

DCN	Sensor	Sensor	Modem	Serial	Serial	Ethernet
	2	1		2	1

Power

Serial

Sensors Modem devices Ethernet

Power

vEM-14

Dry contact inputs

Built-in temperature

& humidity

sensor

CONTROLLER

Rear of unit

	After connecting,
MAKE THESE CONNECTIONS:	check indicators
	on front of unit:
1. POWER: Connect the DC power adapter to the DCN/Power port on the back of the	Power
OpenComms EM.	ON (red)
2. ETHERNET: Connect a straight-through CAT5 Ethernet cable from your 10 Mbit	Link/Cx
network to the Ethernet/ETH port on the back of the OpenComms EM.	ON (green)
3. MODEM: If using a modem, connect an RJ45 cable from a modem to the Modem	Activity/Modem/
port on the back of the unit (see the user manual for modem	Mdm
setup and pinout).	ON (green)
4. SENSOR: Use a sensor—temperature, humidity, combination temperature &	Sensor 1-2
humidity or water detection—or a contact closure cable.*	(EM/EM PDU)
Connect a sensor or contact closure cable to any sensor port (e.g., Sensor 1,	or
	Sensor 1-4
Sensor 2). These connections may be made in any order; the ports are identical
	(vEM-14)
and are configured to accept and recognize all types of sensors.
	ON (green)
5. SERIAL (EM PDU Controller only): Use the serial cable provided with EM PDU
controllers (available separately for vEM-14 controllers).*	Serial 1
Connect the six-wire end of the serial cable into the RS232 port of an MP	or
Advanced power strip.	Serial 2
Connect the other end (eight-wire) of the serial cable to either serial port (Serial 1	ON (green)
or Serial 2) of the OpenComms EM.

*See the user manual for instructions on making your own cable. (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.)

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