RS232 Wiring

This section also applies to the RS422 serial interface.

Equipment

  • Homer (equipped by default with RS232, on demand with RS422 interface).

  • DC power supply 24 V ±10% (see Power Supply Issues).

  • DC power supply cable.

  • Personal computer (PC) with Windows 7 or higher operating system (optimally Windows 10 or higher).

  • RS232-to-PC or RS422-to-PC adapter (e.g., RS232–USB) if your PC is not equipped with RS232 or RS422 port. Please also read A Note on USB-RS232 Adapter.

  • Standard serial RS232 cable (null modem – i.e., with crossed TX-RX wires).

Connection

Fig. 5.  Homer wiring diagram using RS232/RS422 interface.

Notes

Avoid sharing COM ports in your PC with other devices (modems, network cards) or uninstall such device drivers because they may impair communication with the Homer.

See also

Establishing Communication.

COM Port Settings

Fixed COM port settings are:

  • 8 data bits

  • 1 stop bit

  • No parity

Variable COM port settings are:

  • COM port number

  • Baudrate

One should distinguish between COM port settings of

  • Homer unit

  • Controller (PC, PLC, PAC)

With the exception of COM port number, the settings of Controller must be identical with those of the Homer.

Homer COM Port Settings

You cannot modify Homer COM port number because a fixed COM port is used internally. See Configuring Communication for more details.

PC COM Port Settings

In HomSoft, various COM port settings of your PC can be modified in the COM Port Setting dialog window. The window can be opened by clicking the Commun|COM Port menu item.