Serial (SerialPort)

The Serial component allows to configure the BACnet MS/TP or Modbus RTU communication over the RS485 port.

The Serial component has the following slots:

• Status: indicates the current status of the component. If the component works properly, its status is OK; the component's status becomes Disabled if its Enabled slot has been set to false.

  • Available information: Disabled, OK.

• Info: provides a detailed information about non-OK statuses of the component;

  • Available information:

    • Incorrect placement - must be placed under Interfaces container (status Fault): occurs if the component is added anywhere outside the Interfaces folder under BACnet or Modbus;

    • Incorrect configuration (status Fault): occurs when a parameter is missing or wrongly configured (e.g., port number is wrong);

    • Could not reserve port - already in use (status Fault): occurs if the component’s configuration duplicates parameters of a port which is already in use;

    • Port disabled (status Disabled): the Enabled slot in the component is set to false;

    • Network protocol disabled (status Disabled): the Enabled slot in BACnet or Modbus component is set to false;

    • There is a problem with the network protocol (status Disabled): the BACnet or Modbus component is in a status other than OK or Disabled;

• Enabled: change of the slot's value enables or disables the component.

  • Available settings: true (enabled), false (disabled).

Note: If the Enabled slot is in false (meaning the component is disabled), the Status slot becomes Disabled.

Note: By default, the component is enabled.

• Serial Port: shows a serial communication port available in the device;

• Baud Rate: allows to set the baud rate;

  • Available settings: 2400, 4800, 9600, 19200, 38400, 57600, 115200 bps;

• Data Bits: shows the data bits configuration of the Modbus data frame;

  • Available information: 8 bits (Modbus RTU);

• Stop Bits: allows to set the stop bits configuration of the Modbus data frame;

  • Available settings: One, OnePointFive, Two;

• Parity: allows to set the parity bit configuration of the Modbus data frame;

  • Available settings: None, Even, Mark, Odd, Space.

BACnet

Additionally, the following slots are available if the component is configured for BACnet:

• Object Id:

• Max Master: allows to set a maximum address of a master device in the MS/TP network, which server devices send tokens to;

  • Available settings: 0-127 (default);

• Max Info Frames: allows to set a maximum number of information frames that a master device in the MS/TP network may send before it passes the token;

  • Available settings: 1-100 (default: 3);

• Mac Address: allows to set the Mac address of the BACnet server device to be identified by the client device in communication.

Modbus

Whereas if the component is used in Modbus, the following slot is available:

• Steady Time: allows to define the time from the start of the controller to the start of the communication on the Modbus client network.