Kramer Electronics VS-44FO - Manual (Page 17)

14 VS-44FO - Connecting the VS-44FO
Figure 5: DIP-Switch Settings
DIPS Function Description
RS-485 TERM RS-485 line
termination OFF for no RS-485 line termination
ON for RS-485 120

line termination
PROG Firmware update Set ON only to update device firmware
MACH # 1, 2, 3, 4 Self Address Sets the MACHINE # (see Section 5.3.1 )
The RS-485 TERM DIP-switch is used only when the RS-485 port is connected
(see Section 5.3 ). The first and last units on the RS-485 line (for example, the
controller and the last VS-44FO) must be terminated. The units in between must
not be terminated.
Set the PROG DIP-switch ON only while updating the unit firmware, otherwise the
switch must be OFF.
5.3 Connecting a PC or Controller to the RS-485 Port
You can operate the VS-44FO over the RS-485 port from a distance of up to 1200
meters (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-44FO:

On the PC, connect the A (+) pin on the RS-485 port to the A (+) pin on the
RS-485 port on the rear panel of the VS-44FO

On the PC, connect the B ( –) pin on the RS-485 port to the B (–) pin on the
RS-485 port on the rear panel of the VS-44FO

On the PC, connect the G pin on the RS-485 port to the G pin on the RS-485
port on the rear panel of the VS-44FO