Omega Speaker Systems LCIC-WIM-BEN manual RS485

D.5 RS485

Up to 64 LCIC-WIM boards may be connected to one PC port.

In the PC side, use a converter either from the RS232 port, or from the USB port (that is, RS232 to RS485 converter, or USB to RS485 converter). In the board side, use the serial port (CONN3) – refer to the table in the beginning of this appendix.

Using the LCIC-WIM-SETTINGS utility, each board is assigned a unique address between 1 and 64 – refer to section 3.3.2.1.3 (never give the same address to more than one board).

An RS485 board may be either ‘active’ or ‘inactive’. An ‘active’ board honours all commands, while an ‘inactive’ board honours only the RS485 address handling commands. Upon board reset it ‘wakes up’ inactive. A board starts being active when it receives its ‘activate board’ command and stops being active when an ‘activate board’ command to any other board is sent. Hence, only one board (at most) may be active at the same time.

About the handling of the RS485 address while coding your application please refer to the RS485 Commands and RS485 Responses sections below, which expand the summary given in section 4.1/h (‘RS485: Address selection, setting & reading’).

When a board is configured as an RS485 device, its address

is shown for a while on the LED display upon board reset, for example “rS.485-18” for the board addressed 18.

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