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Connecting the VP-81KSi 8x1 UXGA/Audio STEP-IN Switcher
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6.6 Connecting to the VP-81KSi via the RS-485 Port
You can operate the VP-81KSi 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 VP-81KSi:
• 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 VP-81KSi
• 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 VP-81KSi
• 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 VP-81KSi
6.6.1 Setting the RS-485 Machine Number and Bus Termination DIP-switches
This section describes the VP-81KSi DIP-switch settings that determine the
RS-485 machine number and bus termination.
Figure 8 illustrates the factory default DIP-switch positions.
Figure 8: RS-485 DIP-switches
Table 3: RS-485 DIP-switch Settings
DIP-switch Number Function
1, 2, 3 Machine number (see Table 4)
Default—All off (up), machine number 1
4 RS-485 Bus Termination
Default—Off (up)
DIP-switches 1, 2 and 3 determine the RS-485 machine number of the
VP-81KSi. When several VP-81KSi units are connected, the machine number
determines the unique identity of the VP-81KSi on the bus (see
Table 4).
Note:
• When using a stand-alone VP-81KSi unit, set the machine number to 1
(factory default)
• When connecting more than one VP-81KSi, set the first machine (connected
via RS-232) to be machine number 1. The other VP-81KSi units must each be
set to a unique machine number between 2 and 16