Инструкция компьютерное кресло Evolution LX 1

The converter its driver and the virtual serial port along with the cables are provided by Digital Design. Note that it assigns COM3 to the virtual serial port.

Also, in writing Windows Applications is necessary to considerer the following:

Since, we are using the RS485 the biggest difference
related to programming the RS232 is that we can
have up to 32 EVOLUTION Printers and since
communication is initiated by a master computer
some form of arbitration is necessary therefore, the
EVOLUTION
COMMUNICATIONS
PROTOCOL
which is described next must be used accordingly.
Here we must make sure the first data byte to be
sent to the EVOLUTION Printer is the address of the
recipient printer, further complicating this, is the fact
that for compatibility with our legacy systems we are
using 7 bits for transmitting data(which allow us to
transmit 127 ASCII characters), so the byte that
identify the printer address has to be split up into two
nibbles(4 bits long) which means that the original
printer’s address byte has to be masked and shifted in
order to have the Upper/Lower Address nibbles which
are sent separately.

The same has to be done when a parameter (like printer speed) is being transmitted.

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EVOLUTION LX SYSTEM MANUAL Issue 1.0 5 DEC 2009