How to install Johnson AE55/NIE55?

N2 or MS/TP network: Connect three bus lines to a 4-terminal plug labeled FC A or FC B (Figure 6).

LONWorks compatible network: Connect the bus line to a 3-terminal plug (Figure 7), and there is no polarity requirement for the network wiring.

Note: The N2 and BACnet MS/TP bus protocols are different and cannot be connected to the same FC bus port; If connecting to N2 or MS/TP bus, an End of Life (EOL) switch needs to be set up (see "Settings and Adjustments" section).

Modem connection: If needed, connect the phone line to the MODEM port (built-in modem model), or connect an external modem to the USB A port.

RS-232 serial port connection (if required): Use a 9-pin male to male null modem cable to directly connect to a computer, only for point-to-point protocol (PPP) network connection (Serial A port) or obtaining an IP address (Serial B port).

Power connection: Connect the power cord of the 24VAC transformer to the power terminal block (Figure 8) to ensure that the transformer phases of all network devices are consistent (reducing interference and grounding loop issues).

Different network topology wiring specifications

Core limitations and requirements for network types

The N2 network supports 100 devices on a single bus, with a maximum cable length of 1500 meters without repeaters; Recommended 1.5mm ² (18 AWG) 3-core wire,+/- bus must be twisted pair

BACnet MS/TP network supports 100 devices on a single FC bus, with a cable length of 1500 meters without repeaters; Recommended 0.6mm (22 AWG) 3-core shielded twisted pair cable

Ethernet network star topology (requiring network hub/switch), with a maximum of 100 devices connected to a single site

LONWorks network bus topology stub cable with a maximum length of 3 meters; FTT-10 nodes can have a maximum of 64 (without repeaters) or 128 (with repeaters); Install corresponding terminators according to topology type

Settings and Adjustments

Install data protection battery

Remove the battery and open the battery compartment cover on the device (Figure 1).

Connect the connector of the battery cable to the connector inside the battery compartment.

Place the battery in the compartment and secure it with a battery strap (pass through the hole and fasten to reduce movement).

Cover the cabin and immediately connect the 24VAC power supply (to avoid battery depletion and damage).

Attention: The battery can only provide data protection in the event of a power outage after at least 2 hours of initial charging. Full charging (24 hours) can support three consecutive power outages for protection; The battery model is MS-BAT1010-0, with a service life of 3-5 years (at 21 ° C).

Set End Connection (EOL) switch

The devices at both ends of the FC bus section need to be set as network termination devices, and each FC port of NAE55 corresponds to a set of EOL switches:

If NAE55 is an FC bus termination device, set both sets of EOL switches for the corresponding ports to the ON position (default factory ON).

If it is not a terminating device, turn the switch to positions 1 and 2.

Startup and shutdown operations

boot process

Confirm that all wiring is correct and the battery is installed.

Connect the 24VAC power supply, and the device will take up to 5 minutes to start.

Startup completion indicator: The green RUN LED is constantly on, and the red GEN FAULT LED is off.

LED test sequence at startup

After the power is turned on, the PEER COM, RUN, GENL FAULT LEDs (NAE55 also includes FC A, FC B) light up, indicating that the operating system is started.

The above LED is off and the RUN LED is flashing, indicating that the device software is loading.

The LED displays the running status of the device, and if the RUN LED is constantly on, it indicates that the device is ready.

Shutdown process

Disconnect the 24VAC power supply (unplug the power terminal block plug).

The device is powered by a data protection battery and continues to operate for 1-8 minutes (backup volatile data) until the POWER LED goes out.

If the power outage exceeds 48 hours, the data protection battery should be removed after the POWER LED is turned off (to avoid battery depletion and damage).

System restart switch

The System Re Boot switch (Figure 1) can only be pressed when the device is unresponsive and cannot be accessed through the user's device. Restarting will lose the data saved last time (including alarm, trend, and audit tracking data), and other troubleshooting methods should be attempted first.

Troubleshooting

LED status indication (core reference)

Meaning and handling suggestions for abnormal LED names in normal states

POWER (green) constantly on and off indicates that the device is turned off; Always on indicates power supply from battery or 24VAC

ETHENET (green) flashing off indicates no Ethernet traffic, possibly due to network failure or poor connection

FC A/FC B (green) flashing constantly indicates that the port has defined a controller but there is no communication; Extinguish indicates no controller definition (NIE55 does not have this port)

BATT FAULT (red) is off and constantly on, indicating a battery fault (not connected, unable to charge). If it still lights up after 48 hours, check the connection or replace the battery