Hall Research VS-4A - Manual (Page 9)

4 Channel VGA Switch w/Audio & Serial C ontrol
7
3.3 RS-232 Control
The VS-4A can also be controlled via a serial device. The unit
operates at a baud rate of 4800 bps. From the serial port, you
have full control over the operation of the switched output; mode,
priorities, scan time and front-panel lock status.
Note on RS-232 port availability on your PC
Most PCs and notebooks do not have a serial port. So to program
the Switch you may need a USB to RS-232 Serial converter. Please
contact your Hall Research Technologies sales representative if
you need to buy one.
The VS-4A will output a menu to a serial port on power-up. This
menu will also be displayed when a “List” command is sent to it via
a serial port. To view the menu, An ASCII serial terminal or
terminal emulator software is needed. An example is Microsoft
Windows
 HyperTerminal (generally found in
Accessories\Communication folder)
. To configure HyperTerminal
- Connect direct to any available COM port
- 4800 Baud, 8 bits, No Parity, 1 Stop bit, No flow
control