RocketLinx MP1204-XT Hardware Installation

You can use the following information to install the MP1204-XT hardware.

  • Connecting the power

  • Connecting the Alarm

  • Connecting the Ground

  • Mounting the MP1204-XT using the DIN rail or mounting plate option

  • Connecting the MP1204-XT to the network

  • MP1204-XT LEDs


You can use this installation procedure and the RocketLinx MP1204-XT User Guide, which contains detailed installation and configuration information for the MP1204-XT.

Connecting the Power

Use the following information to connect the DC power to the MP1204-XT.

The MP1204-XT provides redundant power inputs (PWR 1/2), which supports reverse polarity protection, and accepts a positive or negative powersource (12V – 57V). However, PWR1 and PWR2 must apply to the same mode In addition, the MP1204-XT supports reverse polarity protection.

Electrical SpecificationsIEEE 802.3afIEEE 802.3at

Power Input Voltage PWR1/PWR2


50-57VDC/5.2A (Max)

Maximum PoE Power/Port



Power Budget PWR1/PWR2


Power Consumption With PD Load (Max)

265W with 240W PSE

Power Consumption

2.92A @ 48VDC [134W]

4.89A @ 53VDC [247W]

Power Consumption without PD Load

14W (max.)


Do not plug the power terminal block into the MP1204-XT before making wire connections, otherwise the screwdriver can inadvertently short the terminal connections to the grounded enclosure.

Power Connector
  1. Insert the wires (12 - 24 AWG) from the power supply into the terminal block connector contacts. Power Connector

  2. Tighten the wire-clamp screws to prevent the wires from coming loose.

    When you apply power, the P1/P2 LEDs turn red during the boot cycle and turn green when the unit is ready.

Connecting the Alarm

If desired, connect the alarm relay output. The fault conditions can be defined using the MP1204-XT user interface or Command Line Interface (CLI) after you program the IP address.

The relay output contacts are on the terminal block connector with the power on the MP1204-XT

The relay contact supports up to 0.5A at 24VDC. Do not apply voltage and current higher than the specifications. The relay output is controlled by the pre-defined operating rules. To activate relay output function, refer to the RocketLinx MP1204-XT User Guide.

Alarm Relay

Connecting Ground

Connect a ground wire between the MP1204-XT chassis and earth ground using 12-24AWG wire to ensure that the MP1204-XT is not damaged by noise or electrical shock.

  1. Loosen the earth ground screw on the right side of the MP1204-XT.

  2. Tighten the screw after the earth ground wire is connected.

Chassis Ground

Mounting the MP1204-XT

Mount the MP1204-XT to the DIN rail using the clip on the back of the unit or use the wall mounting plate.

DIN Rail

Follow the steps below to install the MP1204-XT on a DIN rail:

  1. Attach the DIN rail clip using the screws in the accessory kit

    DIN Rail Mounting
  2. Insert the upper end of DIN rail clip into the back of DIN rail track from its upper side.

  3. Lightly push the bottom of DIN rail clip into the track.

    DIN Rail Mounting

  4. Verify that the DIN rail clip is tightly attached on the track.

Wall Mount Plate

Follow the steps below to install the MP1204-XT with the wall mounting plate:

  1. Place the wall mounting plate on the rear panel of the MP1204-XT.

  2. Use the screws to attach the wall mounting plate to the MP1204-XT.

  3. Use the hook holes at the corners of the wall mounting plate to hang theMP1204-XT onto the wall. DIN Rail Mounting

Connecting to the Network

Connect straight-through or cross-over Ethernet cables between the MP1204-XT RJ45 ports and the network nodes or powered devices (PDs) and connect SFPs.

RJ45 Ports

Ports 1-8 are Gigabit IEEE802.3af (PoE) and IEEE802.3at (PoE Plus) compliant Ethernet ports.

The following table shows the RJ45 PoE pin-out assignment.

PinAssignmentPoE Signal
1, 2T/RX+ and T/Rx-Positive Vport
3, 6T/Rx+ and T/Rx-Negative Vport
4 and 5T/Rx+ and T/Tx-N/A
7 and 8T/Rx+ and T/Tx-N/A

All of the fast Ethernet ports auto-detect the signal from connected devices to negotiate the link speed and duplex mode. Auto MDI/MDIX allows you to connect another switch, hub, or workstation without changing straight-through or crossover cables. Crossover cables cross-connect the transmit lines at each end to the received lines at the opposite end.

Always make sure that the cables between the switch and attached devices (for example, switch, hub, or workstation) do not exceed 100 meters (328 feet).

  • 10BASE-T: Category 3, 4, or 5 cable

  • 100BASE-TX: Category 5 cable

  • 1000BASE-TX: Category 5 or 5e cable

  • IEEE 802.3af: Category 5 cable

  • IEEE 802.3at: Category 5e or 6 cable

Connecting SFPs

Optionally, connect the SFP transceivers. Cross-connect the transmit channel at each end to the receive channel at the opposite end .

The MP1204-XT two Gigabit SFP ports are combo ports with the Gigabit Ethernet RJ45 ports. The speed of the SFP port supports 100BASE-FX and 1000BASE-X. The SFP ports accept standard mini-GBIC SFP transceivers. To ensure system reliability, Pepperl+Fuchs Comtrol, Inc. recommends using Pepperl+Fuchs Comtrol, Inc. certified SFP transceivers.

The SFP and corresponding RJ45 ports work in an exclusive mode. Traffic sent or received through the SFP module will have priority thus no traffic will be sent or received over the corresponding RJ45 connection. To use the RJ45 connection, remove the corresponding SFP module.

SFP Connections


This is a Class 1 Laser/LED product. Do not stare at the Laser/LED Beam.

The SFP port does not function until the fiber cable is linked to another active device. When the SFP module is plugged in and there is no active connection (link) on the fiber, then the Gigabit port will link.

  1. Plug the SFP transceiver into the SFP fiber transceiver.

  2. Connect the transmit channel to the receive channel at each end.

  3. Check the direction/angle of the fiber transceiver and the fiber cable.


Verify that the LEDs display that it is ready to configure the IP address.

P1/P2System readySystem is uploading firmware or the system is rebootingSystem not ready
AlarmIf configured, Ethernet link fails, alarm or power failure alarm occursNot applicableNo conditions configured or there are not any failures
Copper Port Link/Act

Ethernet link up but no traffic is detected

Ethernet link up and there is traffic detected

Ethernet link down
Copper Port SpeedA 1000Mbps connection is detectedNot applicableNo link, a 10Mbps or 100 Mbps connection is detected
SFP Port Link/ActEthernet link is upNot applicableEthernet link down
SFP Port SpeedSFP port speed 1000Mbps connection is detectedNot applicableNo link or a SFP port speed 100Mbps connection is detected
PoE LEDs (1 - 8)PoE is detectedNot applicableNo link
RRRR lights when the Role of the Ring is configured as the Ring-Master and Ring is enabled as either: Chain (Tail) or Balancing Chain (Central Block)Not applicableNot configured as the Ring-Master and ring is not configured.
RSLights when a Ring (or Chain) Signal Failure is detected.Not applicable.Ring or Chain failure not detected.

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