Sennheiser S-MCD 3000 HP - Manual (Page 51)

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You also require special interface cards or convertors which comply with the RS 485 standard. There
are three ways of controlling the receiver from the PC.
1 Operation with interface cards
You can install interface cards with 2 or 4 interfaces in your PC. The interface cards must comply
with the RS 485 standard or have automatic detection of the data direction.
2 Operation via the PC standard ports COM 1 and COM 2
If you want to make the connection via the standard ports, you will require a convertor to trans-
form the RS 232 signals into RS 485 signals.
3 Operation with a laptop
If your laptop has at least one serial RS 232 interface, you will require a convertor to transform the
RS 232 signals into RS 485 signals.
There is also a PCMCIA adaptor with which you can make additional RS 232 interfaces available.
3 Installation
Call up the SETUP.EXE program and this will carry out automatic installation onto the hard disk.
The program is now ready for use.
In order to start the program, it is now only necessary to call up the file “SMCD”.