Display Stats

For thermostats with LCD display, CBAS works with Invensys (formerly Seibe) MN-S3-700, MN-S3-HT, and MN-S4 LCD room sensors. The MN-S3-HT is the same as the MN-S3-700, with a humidity sensor added. The MN-S4 has a Fan On/Off button.

These display stats can be added to VAV controllers or to Professional line controllers (using a SI-S3 Stat Interface board). Only one S3 can be added to a VAV, but it does not require an interface board. You must follow different methods to add a S3 to the 2 different controller types.

Adding a Display Stat to a VAV

Once you have wired the Siebe S3 to Analog Input 3 of the VAV controller, you are ready to program it in Editor Mode of CBAS. First program the VAV controller, then follow the instructions below.

1. From the main menu, click on Database, then click Add a Controller.
2. In the first window, give the controller a descriptive name and click Next.
3. Choose Siebe on the left side of the next window and S3 on the right side.
4. Click Next and choose the VAV controller that will be hosting the display stat.
5. Click Next and click Finish in the next window, which lists the Channel and the address on the channel. There is only one address available on the Siebe Channel hosted by a VAV controller.
6. You can now find the VAV controller in Hardware view. Click on the controller and click Channels.
7. Click on Siebe Channel and click Controllers. You will see the Display Stat listed.
8. Click on the Display Stat and click Points. You will see a list of points with “Add A Point” next to each. These points are standard points, but they need to be added in order for them to show up in Text View.
9. Click Add A Point next to the points you want to use.
10. Give the point a descriptive name and select the one available configuration. Click Add Point Now.

The functions of the points are pre-determined and most are obvious. Here’s a description of some of the less obvious ones:

• Mode: There are 5 modes, which determine what is seen in the display on the Wall Stat itself. The modes are:
  • Temp: Stat display shows the Space Temp
  • SPTemp: Display shows Setpoint when in occupied status, shows Space Temp when in unoccupied status.
  • Setpnt: Shows Setpoint all the time
  • Altern: Display shows Alternate Display Number, which can be set to anything
  • RH: Display shows Relative Humidity if programmed (only thru VAV)
• Alternate Display Number: Put in the number you want to be displayed when in Altern Mode.
• Unoccupied/Occupied Enable: When enabled, this allows you to change Occupied/Unoccupied mode from the button on the Display Stat.

If you need to program many identical VAV controllers with S3 Display Stats, you can use a template. Program the first VAV with the Siebe channel, display stat, and it’s points. Click on the VAV controller and click Save Controller Database as Template. When programming the subsequent controllers, choose to create the controller from template, instead of a blank database.

Adding a Display Stat to a Professional Line Controller

In order to program a Wall Stat, you must first program the controller that it is wired to. Let’s assume we have an 8X controller programmed on a TCP/IP channel already.

1. In Editor Mode, go to Hardware View, TCP/IP Controllers channel, Controllers button, and click on the controller that is to be used as the host channel for the Display Stat(s).
2. Click on Channels, and click Add a Channel next to RS-485 Host.
3. Enter a name for the channel and click Select Configuration.
4. Choose Opto-22 on Controller and click Add Channel Now. This channel will not show up in the channel list in Hardware View. You will only be able to access it through Channels on the controller.
5. To program the Wall Stat on the Channel you created, click on the channel you just created and click Controllers. Each line corresponds to an address.
6. Click on the address you want to add a S3 to and you will see the following pop-up.
7. Give it a descriptive name.
8. Click “Select Configuration” and choose S3.
9. Click “Add Controller NOW!”
10. To add points to the S3, click on it, then Points.
11. Click on Add A Point next to the point you want to program and give it a name that includes the name of the Wall Stat.

The names and functions of the points are the same as those added through a VAV.

It is a good idea to erase any database that might be on the Wall Stat host controller when opening the database in Real Mode after adding a Wall Stat to the database. To do that, click on the Wall Stat Host controller and click Erase Database. The controller will automatically download the new database.

Setting the Address on the Stat Interface Board

There are toggle switches numbered 1 thru 8, which relate to the values of a binary Byte. Flip enough toggle switches to equal the number of the address. The values are as follows:

1 = 128
2 = 64
3 = 32
4 = 16
5 = 8
6 = 4
7 = 2
8 = 1

For example, a controller with address 10 would have switch 5 and 7 in the ON position. 8 + 2 = 10
Address 97 would have switches 2, 3, and 8 in the ON position. 64 + 32 + 1 = 97

Lights on the Interface Board:

• +5V: This light should be solid green when power is properly applied.
• RUN: Steady red blink when the board is running.
• STAT: Steady red blink when communication is established with the Display Stat (Stat will display also).
• RxD: Steady fast yellow blink when normal RS-485 communication is established.
• TxD: Occasional green blink when normal RS-485 communication is established.

Known Limitations:

• There is a problem with mode. Mode has 5 states (temp, SP & temp, SP, Alt, %RH). The RH mode does not work with the new S3 Interface firmware. So you can’t get the S3 to display Humidity when going through an 8X. All display modes work when attached to a VAV.
• When you change the range of the S3 Setpoint in CBAS, it will not download automatically to the Display Stat. It should download after commanding the Setpoint in CBAS. If it doesn’t, a download can be forced by cycling power to the Interface board.
• As of version 1.5.22 of CBAS, the Humidity point was added to S3 Display Stats with humidity capability, but only for use with VAV controllers. Now, Humidity is functional on the Professional line of controllers, through the host or secondary channel using a Stat Interface board. The requirements for this are: upgrade firmware on the Stat Interface board (cin# AB90; possible firmware upgrade to board hosting S3 channel. (V8.8)
• There are 2 ways of using the S3 with an interface board. One is to add it to an Opto-22 on Controller channel and the other is to put it on an Opto RS-485 over TCP/IP channel. Here’s the difference: When you add it to the Opto-22 channel, it becomes part of the database on the host controller. This is the preferred way, because the controller and the S3 stats are always talking, even if the head end computer is down. If you add the S3 to an Opto RS-485 over TCP/IP channel, the points on the S3 do not become part of the database on the host controller. The host controller only passes the information back and forth between the head end and the S3. It is not necessary to upgrade the firmware on the Stat Interface.