Kramer Electronics VS-162V - Manual (Page 27)

Connecting a Control Interface
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the RS-232 control interface, each switcher must interconnect via the
RS-232 control interface and not via the RS-485 control interface.
Choose the RS-232 control interface for a point-to-point connection with a
range of about 25 meters.
Choose the RS-485 control interface to operate the switcher from an
extended distance of up to 1000 meters.
9.1 Connecting the RS-232 Control Interface
Connect several switchers (from the series of 16x16 matrix switchers) and
the control unit in an RS-232 daisy chain arrangement, with or without
using a null-modem adapter, as shown in
Figure 13 .
The RS-232 daisy chain switcher arrangement is transparent. This lets you
arrange the switchers (from the series of 16x16 matrix switchers) according
to your requirements, and not according to a fixed sequence dependent on
the MACHINE # and/or MACHINE ADDRESS #.
Figure 13: Connecting a PC to 4 VS-162V Units