user manual

Connecting the VP-81KSi 8x1 UXGA/Audio STEP-IN Switcher

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