Preparing to enroll the Mercury controller

2026-03-31

Before you enroll the Mercury controller on the Synergis™ Cloud Link unit, you must assign a static IP address to the controller.

Before you begin

Make sure you have the following:

Mercury Setup and Configuration Guide: Instruction manual for connecting to the web portal of your Mercury controller and setting up its IP address (and other configurations).
Static IP address: Static IP address assigned to the controller by your IT department.
Physical addresses: Each interface panel attached to the same RS-485 port of the same Mercury controller must have a unique physical address (configured on a DIP switch).

Best Practice:

If you have many Mercury controllers to enroll on the same Synergis Cloud Link unit, it is best to enroll them all at the same time. Each controller you add or remove from the Synergis Cloud Link unit causes the unit to restart. While the unit restarts, it’s offline for about 30 seconds.

What you should know

Mercury controllers enrolled on the same Synergis Cloud Link unit cannot be assigned different partitions in Security Center. If you need to assign the controllers to different partitions, enroll them on different Synergis Cloud Link units, and then assign the Synergis Cloud Link units to different partitions.

Note:

The steps and instructions tagged with Hardening are optional, but will protect your system against cyberattacks.

Procedure

On the Mercury controller, set the DIP switch S1-1 to ON.
This gives you a five-minute window to sign in using factory default settings.
Sign in to the Mercury controller through its Configuration Manager web page. Use the default IP address (192.168.0.251) and credentials (admin/password). For more information, see the manufacturer’s documentation.
On the Mercury controller, set the DIP switch S1-1 back to OFF for normal operation.
This prevents the factory default settings from being used to sign in to the controller.
Select Network from the menu, configure the Mercury controller’s IP address, and click Accept.
Select Host Comm from the menu.
In the Host Communication page, configure the following settings, and click Accept.

Communication Address

Set to 0.
Important:
Not to be confused with the Channel that must be unique when you enroll the Mercury controller on the Synergis Cloud Link unit.

Port Number

The port number used by the Synergis Cloud Link unit to communicate with the Mercury controller (default=3001).

Authorized IP Address Required

(Hardening) Select this option, and set Authorized IP address to the IP address of the Synergis Cloud Link unit.

Data Security

Set to TLS Required.
Important:
If TLS is not selected, the Mercury controller stays offline.
Create a new user on the Mercury controller.
This saves you from having to physically access the unit and set the DIP switch S1-1 to ON every time you modify the controller configuration.
1. From the left-side menu, click Users.
2. Under the users list, click New User.
  The User Account page opens.
3. Enter a new Username and a strong Password.
4. Confirm the password, and then click Save.
The Users page opens and the new user is added to the list.
Under Time Server, select Disable.
The Time Server is not required. Synergis™ Softwire monitors and automatically sets the time on the Mercury units.
(Hardening) Next to SNMP Options, select Disabled, and then click Submit.
From the left-side menu, click Apply Settings, and then click Apply Settings, Reboot.

After you finish

The next time you need to sign in to the Mercury controller, you can user the new user.
Enroll the Mercury controller on the Synergis Cloud Link unit.