Kramer Electronics VP-4x8 - Manual (Page 14)

VP-4x8 - Connecting the VP-4x8 11
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 6 )—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 6: Straight Cable RS-232 Connection with a Null Modem Adapter
5.3 Connecting the RS-485 Port to a PC or Controller
You can operate the VP-4x8 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-4x8:
•
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-4x8
•
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-4x8
•
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-4x8
1
2
6
3
7
4
8
5
9
to PC
Null-Modem
Adapter