How can a central monitoring system (CMS) be integrated with the SLCS?

  1. The SLCS has the CC1000 Modbus gateway device that serves as a communications converter between the D-Bus and the Modbus to enable a CMS to be integrated with the SLCS. The CC1000 serves as a slave to the CMS which can report the real time status of the relays as well as control them.
  2. The CC1000 is equipped with both RS232 and RS485 as its communications interface with the CMS. When RS485 is the interface selected, each CC1000 will have its own device which enables multiple CC1000 devices to be placed on the same RS485 bus to build a large scale multiple SLCS networks controlled from a single CMS. Of course when RS232 is selected, then the link between the CC1000 and the CMS can only be one to one.

How does one determine the quality of a gateway?

    The gateway serves as a bridge and converts between two different types of communication systems, as a CMS by itself is unable to directly command, nor can it determine the status of any device on the D-Bus, which is what the CC1000 is for. A good gateway should have a short response time between the sending of a command and getting a response.

Is it possible to synchronize the status information for both the local switches and CMS?

    Yes it is possible as the CC1000 constantly monitors the D-Bus activity for any changes and records it for the CMS to read from, the maximum latency for the change to occur to the CMS getting the information is 2 seconds, this time is not inclusive of the processing delay by the software on the CMS.

How should the CMS respond when the power is interrupted and subsequently restored?

    The CC1000 will take at least 3 seconds to reestablish its connections with the various devices on the D-Bus and update its data, within this 3 second period, the CC1000 will not respond to any commands or requests for data. The CMS should thus wait at least this much time before starting it polling of the CC1000.

Can the CC1000 communicate through TCP/IP?

    An Ethernet to RS485 converter can be connected to the RS485 interface of the CC1000, this would then enable a CMS on the Internet or local network to connect to the D-Bus network.

How does one determine the communication activity of the CC1000?

    The CC1000 has activity indicator LEDs for both the CC1000 to D-Bus as well as the CC1000 to CMS interfaces. These LED indicators will flash continuously when there is activity in their respective connections.

What are the differences between the CC1000 and the CC500?

    The CC500 is an economical small scale version of the CC1000, it is typically used for homes and small offices or used in conjunction with the color touch panel. Their differences are:
  1. Capacity - A D-Bus network can have up to 64 LTUs. The CC1000 can service all 64 LTUs, while the CC500 can only service up to 16 LTUs. Although up to four CC500 can be connected to the same D-Bus, with each serving a different segment of LTUs (1 to 16, or 17 to 32, or 33 to 48, or 49 to 64)
  2. Power Supply - The CC1000 uses AC 110 or 220V, while the CC500 requires DC 24V
  3. Communications Interface - The CC1000 is equipped with both RS485 and RS232, while the CC500 is available in two separate models with either RS485 or RS232 interfaces, but not both.

How to connect the CC1000 to different types of CMS?

  1. When the CMS is based on a BAS such as a Honeywell/Siemens system, such a system typically has an optional Modbus gateway component which can be interfaced with the CC1000.
  2. For an industrial software such as Intouch, iFix, Citech, etc. They can be configured for the type of protocol to use, simply select Modbus/RTU for it to be able to communicate with the CC1000.
  3. 3. When using an embedded PC with custom designed software, simply directly write the necessary Modbus protocols and registers into the program.

What is the protocol and data format used by the CC1000/CC500 for communicating with the CMS?

    The protocol is Modbus/RTU, the data format is 8 bits, no parity, 1 stop bit. The baud rate is 9600. The hardware interface on the CMS side can be either RS232 or RS485.