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APPENDIX A
RS-232 PROGRAMMING INSTRUCTIONS
The VP251 can communicate with other controllers
that provide an RS-232 interface. Adjustable baud
rates are 19,200, 9,600, 4,800, 2,400 and 1,200
with 9,600 as factory default. (Contact factory for
details if baud rate needs to be changed.)
Communication settings are 8 bits, N parity and 1
stop bit. A terminal emulator program, like the one
found in Windows, can be used to control the
VP251.
All RS-232 commands require the header of
‘VP251’ to be used at the beginning of each new
command string, followed by any of the commands
listed below. Commands may be of either upper or
lower case characters. All commands are
terminated by a carriage return (13H).
RS-232 Commands:
The following commands can be listed a a multiple
command separated by a comma:
B = Brightness ( 0 to 255 )
C = Contrast ( 0 to 255 )
K = Color ( 0 to 255 )
T = Tint (0 to 255)
D = Detail (0 to 15)
Example: VP251,B100,C75 (ENTER)
2
3
5
2
3
5
RxD
TxD
Ground*
TxD
RxD
Ground*
PC Computer
9 Pin Male “D”
VP251
9 Pin Female “D”
*2 Conductor Shielded Wire Recommended
VP251 RS-232 Cable
The following commands must be entered individually:
HELP = Displays a help menu
P0 = Factory Preset ( not user changeable)
P1 = User Preset 1
P2 = User Preset 2
P3 = User Preset 3
P4 = User Preset 4
L1 = Store User Preset 1
L2 = Store User Preset 2
L3 = Store User Preset 3
L4 = Store User Preset 4
ON = Turn On the VP251
OFF = Turn Off the VP251
ST = Return current settings status to controller
V = Select Video Input Mode
Y = Select Y/C Input Mode
X = Select YUV Input Mode
R = Select RGB Input Mode
G = Select VGA Input (Computer/HDTV pass-through)
E0 = Echo Off
E1 = Echo On (default)
The On-Screen-Display (OSD) location on the monitor
can be changed using RS232 commands. The OSD
can also be disabled by RS232.
OSD ON = Enable the OSD
OSD OFF = Disable the OSD
OSD xxx,xxx = (Where xxx = 0 to 152) Select
placement of OSD (factory default: 0,35)
OSD can also be changed by moving a jumper located
inside the unit. Contact factory for details.
