1 connecting a pc, Connecting a pc, Figure 4: crossed cable rs-232 connection – Kramer Electronics VP-730 User Manual

Page 18: N 5.1

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VP-730 - Connecting the VP-730

13

13

5.1

Connecting a PC

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 4

)—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 4: Crossed Cable RS-232 Connection

Hardware flow control is not required for this unit. In the rare case where a
controller requires hardware flow control, short pin 1 to 7 and 8, and pin 4 to 6 on
the controller side.

Method B (

Figure 5

)—Connect the RS-232 9-pin D-sub port on the unit via a

straight (flat) cable to the null-modem adapter, and connect the null-modem adapter
to the RS-232 9-pin D-sub port on the PC. The straight cable usually contains all
nine wires for a full connection of the D-sub connector. Because the null-modem
adapter (which already includes the flow control jumpering described in Method A
above) only requires pins 2, 3 and 5 to be connected, you are free to decide
whether to connect only these 3 pins or all 9 pins.

Figure 5: Straight Cable RS-232 Connection with a Null Modem Adapter

1

2

6

3

7

4

8

5

9

1

2

6

3

7

4

8

5

9

PC

1

2

6

3

7

4

8

5

9

to PC

Null-Modem

Adapter

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