Breadcrumbs

SlaveNetwork

The slave network is used for communication of the iSMA-B-FCU device with the upper-level systems (for example, BMS). Communication can be realized by the Modbus RTU/ASCII or the BACnet MS/TP protocol (depends on the PROTOCOL DIP switch configuration).

The SlaveNetwork component is used to manage the BACnet MS/TP or Modbus RTU/ASCII protocols, using the RS485 port. The SlaveNetwork component has to be placed under the Drivers component.

Note:

In the BACnet slave network, the ReadRange and ReinitializeDevice services are supported.

33 SlaveNetwork.png
The SlaveNetwork component

The SlaveNetwork component has the following slots:

  • Status: indicates the network status;

  • Fault Cause: shows the fault cause description;

  • Baudrate: indicates the baud rate of communication (set by the PROTOCOL DIP Switch);

  • Data Bits: displays the number of data bits; the default value is 8;

  • Parity Bits: configures the parity bits: Parity_Disabled, Odd, Even;

  • Stop Bits: displays the number of stop bits; the default value is 1;

  • Protocol: displays the protocol used for communication: Modbus or BACnet (set by the PROTOCOL DIP switch);

  • Slave Address: displays the actual address of the device (set by the MAC DIP switch);

  • Device Name: sets the BACnet device name;

  • BACnet Id: displays the actual BACnet Id; the default value equals to 826000 + Slave Address. The BACnet Id can be set using the Set BACnet ID action.

The SlaveNetwork component has the following action, available in the context menu:

  • Set BACnet ID: sets the BACnet ID of the device.

COV Increment

For the three components available for the SlaveNetwork (NVNetNumeric, NVNetBoolean, NVNetMultiState) it is possible to enable the COV Increment functionality over BACnet.

The FCU controller can report to up to 50 active subscriptions from up to 10 different clients simultaneously. Subscriptions are volatile and must renewed after the FCU restart.
If client requests the subscription of the already subscribed object, then subscription is renewed.
If subscribing client goes offline, its subscription is not removed from the FCU.

Note:

  • COV increment value for each subscription is non-volatile;

  • Restore default and Copy NV to default actions set all COV increment values to default value 1.