Kramer Electronics VM-24H - Manual (Page 14)

VM-24H - Operating the VM-24H 11
6 Operating the VM-24H
This section describes how to:

Control the VM-24H via RS-232, see Section
‎6.1

Operate the VM-24H, see Section ‎6.2

Use the EDID button, see Section ‎6.3
6.1 Controlling 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 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
1
2
6
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9
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PC