Hall Research VSM-I-A-4-JA4 - Manual (Page 9)

Genesis™ Series 4x4 AV Matrix Switches
7
URA does not have RGB Skew correction so you would need to use low-
skew UTP cable for that option if the distance is over 200 ft. The URA-SKU,
or URA-XT, both have RGB skew correction so you can use any Cat5e or
Cat6 cable regardless of length
 Similar to the audio input, the audio outputs are also balanced. So when
connecting to balanced devices use both + and – terminals. But if you are
connecting the output to unbalanced sinks (such as using 3.5mm mini-stereo
plugs), do not connect the unused outputs to ground. You can connect the
tip and ring to either + sides or the – sides, as shown below.
Figure 4 –
Connecting balanced audio outputs to
unbalanced devices
 If the matrix needs to be controlled via RS-232, plug the controller (or PC) to
the DB9 Female port on the rear of the matrix. Connection to PC’s DB9 Male
is made using a straight through DB9 Male-to-Female cable (as shown
below).
DB9-Female on Matrix Controller DB9-Male
Pin Function Pin Function
2 TX (output)  2 RX (input)
3 RX (input)  3 TX (output)
5 Ground 5 Ground
Table 2 – RS-232 Control Port Pinout
Note on RS-232 port availability on PC
Most PCs do not have a serial port, so you may need
a USB to RS-232 Serial converter. These are available
from Hall Research (Model USB-RS232-1).
 The 4x4 VSM matrix is available with IP port (VSM-I- …). On these units
there is an RJ45 (10/100 Base-T) for connection to your Local Area Network.