Kramer VS-4228, User Manual

Page: 15 / 24

12 VS-4228 - Connecting the VS-4228
4.2 Connecting a PC or Controller to the RS-485 Port
You can operate the VS-4228 via the RS-485 port from a distance of up to 1200m
(3900ft) using any device equipped with an RS-485 port (for example, a PC). For
successful communication, you must set the RS-485 machine number and bus
termination.
To connect a device with a RS-485 port to the VS-4228 :

Connect the A (+) pin on the RS-485 port of the PC to the A (+) pin on the
RS-485 port on the rear panel of the VS-4228

Connect the B (
–) pin on the RS-485 port of the PC to the B (–) pin on the
RS-485 port on the rear panel of the VS-4228

Connect the G pin on the RS-485 port of the PC to the G pin on the RS-485
port on the rear panel of the VS-4228
4.3 Cascading Multiple Units
You can cascade up to eight individual VS-4228 units to switch up to 64
master/slave devices using either the RS-232 (see Section
4.3.1
) or RS-485 (see
Section
4.3.2
) interfaces.
When cascading two or more devices, you must set a unique machine number for
each device.
To set the machine number:
1. Turn the VS-4228 ON. The flashing digit in the display is the machine
number of the device.
2. To set another number, press the SLAVE button of the desired number while
the digit is flashing. The digit changes to the new number. When it stops
flashing, the new machine number is set.