VGA/Stereo Audio Matrix Switcher 8x8
PTN Electronics Limited www.PTN-electronics.com
7
5.3. Connection with RS232 Communication Port
Except the front control panel, infrared remote controller (Optional) and the Ethernet
control (Optional), the MVG matrix switcher can be controlled from far-end control
systems via the RS232 communication port. This RS232 communication port is a
female 9-pin D connector. The definition of its pins is as the table below.
No.
Pin
Function
1
N/u
Unused
2
Tx
Transmit
3
Rx
Receive
4
N/u
Unused
5
Gnd
Ground
6
N/u
Unused
7
N/u
Unused
8
N/u
Unused
9
N/u
Unused
F5-3 9HDF
5.4. Connection with Computer
When the switcher connects to the COM1 or COM2 of the computer with control
software, users can control it by that computer.
Please refer the details in
Communication Protocol and Command Codes
.
RS-232
Computer for controlling
Converter
F5-4 MVG connecting to computer
5.5. Audio Signal Connection
Audio connection is little complicated than video. It has two kinds of connection:
balanced and unbalanced.
The balanced connection transmits a pair of balanced signals with two signal cords.
Because interferences will have the same intensity and the opposite phases on the two
signal cords, it will be counteracted in the end. For the low frequency extent of the audio
signal, it would be easily interfered under long distance transmission. Therefore
,
as an
anti-interference connection, it is mostly used in audio connection of special device.
The unbalanced connection transmits signals only with a signal cord. Without
