SCU dip switch 6 for dual station addressing


clarification on dip switch six and station addressing for the SCU1200, SCU1280, or SCU1284

Product Line



I/NET Seven with Access Control using an SCU

gives note on how to have One Reader, Two Doors, 1 Reader, 2 Doors


Clarification on SCU and dip switch settings being open, enabled for dual or single station addressing (2 or 4 doors)


If the Device Type is SCU1200, SCU1280, or SCU1284, set the Number of points to either 1 or 2. Choose 1 if the SCU is configured to operate in the “single-address” mode (DIP switch S1-6 = OFF). Choose 2 if the SCU is configured to operate in the “double-address” mode (DIP switch S1-6 = ON).

In order to control more than two doors, the SCU1284 must be configured to operate in the double-address mode. Though the TCON312 shows the dip switches for 1-6, there is still a bit of clarity which can be provided on how that looks on an actual SCU. The example from the TCON is shown here:

And this is a photo below of an SCU which is setup as 0101 with dual addressing since Dip Switch 6 is in Dual Address mode shown in the picture below. When penetrating down to it using Edit, Host Computer, Network Configuration, SCU 1284 is shown with 2 Points with door addresses:

010108 Door1

010109 Door2

010208 Door3

010209 Door4

After checking MCU Configuration, I added the points in the Network configuration. The main point here is that Dip Switch 6 is up on the Open side of the Switch bar shown in red which is the dual point and 4 door configuration.


Note: Concerning the numbering scheme for addressing the SCU, it is important to number your SCUs with an address then skip the next number so in the event you dual addressing for four doors, the second address is available. Don't use addresses 28, 29,30, and 31 as those are reserved for the Remote Arming Terminal.  Overlooking this can result in future headaches of moving SCUs around in the addressing scheme which is never recommended.

Example for a site containing 4 SCU door controllers: SCUa address 2, SCUb Address 4, SCUc Address 6, SCUd Address 8. 

Another example configuration: One reader inputs to READER1 and READER2? Here is that wiring example.

In order to use more than the first eight inputs on the SCU, you must configure the SCU as a double-address controller. When you enable the double-address mode (DIP switch S1-6 = ON), inputs 1 through 8 are monitored on the selected subLAN address (i.e., the primary address) and inputs 9 through 12 are monitored on the next consecutive subLAN address (i.e., the secondary address). The input points are defined in the I/NET host using two separate SCU controller assignments, the first providing eight input point definitions and the second providing 4 input point definitions.

The SCU’s outputs are also divided across two LAN addresses when the SCU is operating in the double-address mode. The first four outputs are assigned to bit offsets 00 through 03 on the SCU’s primary address. The last four outputs are assigned to bit offsets 00 through 03 on the SCU’s secondary address.