Hall Research VS-2 - Manual (Page 7)

5
COMPACT ELECTRONIC VGA SWITCH
TTL: (3 down)
In this mode the selection of input is determined by an external contact closure or TTL
signal. The customer should provide his or her own cable. The signal is to be asserted
between the tip and ground of the 3.5mm mini-plug. A high (or open input) selects input
#1 and a low (or short to ground) will select input #2. The center ring of the connector
can be used to light an external LED for indication of the selected channel if desired.
Simply tie the ring to the anode of a Led with the cathode tied to ground.
RS-232: (4 down)
This position is to allow the switch to be controlled via a Serial device. The same CTRL
connector is used to attach the device to the serial port via a supplied cable. The unit
operates at 1200 baud (adequate since only single ASCII characters are used to
command the switching, and the lower baud rate eliminates cable length, shielding and
noise issues). From the serial port you have full control over the operation of the switch
(e.g. select input 1, input 2, blank the output, un-blank the output, or place the switch in
and out of auto-mode).
More on Serial (RS-232) operation
Approximately one second after power-up, the VS-2 will output a menu on the serial port.
To view the menu you need ASCII serial terminal or terminal emulator software. An
example is Windows® Hyper-terminal® (generally found in Accessories\Communication
folder).
To Configure Hyper-terminal:
• Connect Direct to Com1 or Com2
• 1200 Baud, 8 bits, No Parity,
1 Stop bit, No flow control
•
Settings per following figures :