What is RS232?

RS232 is an industry standard communications interface between a PC computer and a peripheral device. The RS232 interface is usually known as ¡°serial¡± interface and is used to control a peripheral device, such as modems and display devices. The RS232 interface is sometimes called the RS232C interface. The RS232 standard requires peripheral devices to use a 25-pin or a 9-pin connector. Orion¡'s Public view monitor and 15LCD built in 4/8ch DVR use 9-pin connectors.

How does RS232 work?
The serial interface is a two-way communications device meaning that it can send and receive data at the same time.

The speed in which the interface communicates is denoted by the 'baud rate.'
Orion's Public view monitor and 15LCD built in 4/8ch DVR operate at a baud rate of 9600.

The RS-232 standard imposes a cable length limit of 50 feet; however, this is usually ignored since a cable can be as long as 10000 feet at baud rates up to 192000 if you use a high quality, well shielded cable. The external environment has a large effect on lengths for unshielded cables. In electrically noisy environments, even very short cables can pick up stray signals. For Orion's Public view monitor and 15LCD built in 4/8ch DVR, the following offers some reasonable guidelines for 24 gauge wire under typical conditions.

Baud Rate: 9600
Shielded Cable Length: 250
Unshielded Cable Length: 100
What is component video?
If you see the Check Signal or No Connection, Check Signal Cable message, it means either:
a) If you have an analog monitor, that the signal cable connecting your video card to your monitor is loose or disconnected.
b) If you have a digital monitor and you are using a DVI cable, that the DVI cable is loose or the monitor is set to analog.

To rectify the problem if you have an analog monitor, make sure that the signal cable is connected firmly to the monitor and to the video card.
To rectify the problem if you have a digital monitor, first make sure that the DVI cable is connected firmly to the monitor and to the video card.
If that does not solve the problem, press the source button on your monitor to make sure the monitor is in digital mode.

If you have a digital monitor, but you are using a standard D-sub cable to connect it to your computer and you are running the monitor in analog mode, use the instructions for analog monitors above.

If the signal cable is connected firmly to the monitor and the video card and you still see the Check Signal message, most likely the cable is defective. If this is the case, try replacing the cable.
What is EXT(RGB)?
EXT(RGB) is the name given to a kind of terminal or jack that is available on some multi-purpose ORION monitors.
The EXT(RGB) jack or connection terminal is actually a 21 pin SCART RGB video jack that is compatible with SCART plugs and connectors. SCART is found mainly in Europe where it is used on video devices compatible with the PAL video standard.
RGB, by the way, stands for red, green, blue.
What is contrast ratio?
The contrast ratio indicates the difference in light intensity measured in cd/m2 (candelas per square meter) between the brightest white on a monitor screen and the darkest black.
It is calculated by subtracting the value of the darkest black from the brightest white, then dividing the result by the darkest dark (Brightest - Darkest/Darkest). Results are typically shown in the following format: 400:1.
Generally, better monitors have higher contrast ratios.
Light intensity per unit of area is also known as luminance.
What is cd/m2?
Cd/m2 - Candelas per square meter. A candela is a measure of luminous intensity.

Cd/m2 is a measure of luminous intensity per square meter, a quality also called luminance.

The higher the cd/m2, the brighter the luminous object. Consequently, a monitor rated at 300 cd/m2, will look brighter than a monitor rated at 250 cd/m2.
What is a RGB?
sRGB - Standard Red Green Blue. The color standard that defines the standard combinations and luminance values of the red, green, and blue light that make up the colors used by most CRT monitors, LCD monitors, scanners, printers, and digital cameras.
What are the pin assignments for a 15 Pin D-sub connector?
The standard pin assignments and signal connections for a 15 pin D-sub monitor connector (15 pin video SVGA connector) are listed in the chart below:

Signal Connections and Pin Assignments

Pin Separate H/V Composite H/V Sync on green
1 Red Red Red
2 Green Green Green + H/V sync
3 Blue Blue Blue
5 GND (DDC Return) GND (DDC Return) GND (DDC Return)
6 GND-Red GND-Red GND-Red
7 GND-Green GND-Green GND-Green
8 GND-Blue GND-Blue GND-Blue
9 No Connection No Connection No Connection
10 GND Sync/Self Test GND Sync/Self Test GND Sync/Self Test
12 DDC Data DDC Data DDC Data
13 Horizontal Sync H/V Sync Not Used
14 Vertical Sync Not Used Not Used
15 DDC Clock DDC Clock DDC Clock