Hall Research VS-4A - Manual (Page 10)

4 Channel VGA Switch w/Audio & Serial C ontrol
8
After power-up the unit will output the following menu in ASCII
through its serial port:
3.4 Serial Port Control Codes
(1 byte commands from external control device)
ASCII 1 (or Hex 31)
Selects Video input #1
ASCII 2 (or Hex 32)
Selects Video input #2
ASCII 3 (or Hex 33)
Selects Video input #3
ASCII 4 (or Hex 34)
Selects Video input #4
Ver1.0
------
1 = #1 In
2 = #2 In
3 = #3 In
4 = #4 In
a = Auto mode
s = Scan
b = Blank
u = Un-Blank
p = Priorities
r = Reset
l = Lock/Unlock