Instruction Manual

VS-311H - Connecting the VS-311H

connect the appropriate input number (input 1, 2 or 3) pin on the REMOTE

terminal block connector to the G (Ground) pin, as Figure 4 illustrates.

When in the manual mode (DIP-switch 4 set to OFF), you can switch an input to the output

using the front panel INPUT SELECT button.

Note that unless the connection is permanent, the VS-311H will revert to an automatic

switcher when the connection is removed.

DO NOT Connect more than one PIN to the Ground PIN at the

same time.

Figure 4: Connecting the Contact Closure Remote Control PINS

4.4 Connecting to the VS-311H via RS-232

You can connect to the unit via a crossed RS-232 connection, using for example,

a PC. A crossed cable or null-modem is required as shown in method A and B

respectively. If a shielded cable is used, connect the shield to pin 5.

Method A (Figure 5)—Connect the RS-232 9-pin D-sub port on the unit via a

crossed cable (only pin 2 to pin 3, pin 3 to pin 2, and pin 5 to pin 5 need be

connected) to the RS-232 9-pin D-sub port on the PC.

Note: There is no need to connect any other pins.

Figure 5: Crossed Cable RS-232 Connection

To route IN 1 to the

output, temporarily

attach PIN 1 to

PIN G (Ground)

To route IN 2 to the

output, temporarily

attach PIN 2 to

PIN G (Ground)

To route IN 3 to the

output, temporarily

attach PIN 3 to

PIN G (Ground)