1 connecting a pc or controller to the rs-232 port, Connecting a pc or controller to the rs-232 port, Figure 6: crossed cable rs-232 connection – Kramer Electronics VS-4228 User Manual
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VS-4228 - Connecting the VS-4228
4.1
Connecting a PC or Controller to the RS-232 Port
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 (
)—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 6: 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 (
)—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 7: 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