Question 1

Does this monitor allow rotation to portrait orientation?

Accepted Answer

It's a wonderful monitor but it does not allow rotation to portrait orientation.  Other than that, I've very happy with it, beautiful screen, stable (doesn't wobble or shake), Good selection options.

Question 2

what kind of disport is it 1.2, 1.3 or 1.4?

Accepted Answer

Version 1.2

Question 3

What is the refresh rate on this monitor?

Accepted Answer

Here are more detailed specs for the model. Hope this helps. The required Frequency is 50/60 Hz. The Vertical Refresh Rate is 49 - 76 Hz and the Horizontal Refresh Rate is 30 - 83 Hz.

Display Type: LED-backlit LCD monitor / TFT active matrix

Aspect Ratio: Widescreen - 16:9

Native Resolution: Full HD 1920 x 1080

Contrast Ratio: 1000:1 / 100000000:1 (dynamic)

Color Support: 16.7 million colors

Controls & Adjustments: Color temperature

Dimensions (WxDxH): 20.2 in x 7.7 in x 15.1 in - with stand

Horizontal Viewing Angle: 178

Vertical Viewing Angle: 178

Pixel Pitch: 0.248 mm

Panel Type: IPS

Brightness: 250 cd/m²

Screen Coating: Anti-glare

Horizontal Refresh Rate: 30 - 83 Hz

Backlight Technology: LED backlight

Vertical Refresh Rate: 49 - 76 Hz

Nominal Voltage: AC 120/230 V

Frequency Required: 50/60 Hz

Power Consumption Operational: 21.09 Watt

Power Consumption Stand by: 0.5 Watt

Power Consumption Sleep: 0 Watt

Speakers - stereo 
Output Power / Channel - 2 Watt

Image Brightness: 250 cd/m2

Image Contrast Ratio: 1000:1

Video Format: 1080p (Full HD)

Type: LED-backlit LCD monitor

Microsoft Certifications: Compatible with Windows 7

Color: black

Controls & Adjustments: color temperature

Flat Panel Mount Interface: 100 x 100 mm

Environmental Standards:
EPEAT Compliant 
EPEAT Gold 
ENERGY STAR Qualified: Yes

Display Position Adjustments: Tilt

Flat Panel Mount Interface: 100 x 100 mm

Tilt Angle: -5/+20

Audio Output:
Output Power / Channel - 2 Watt

Dimensions & Weight:
Width: 20.2 in 
Depth: 7.7 in 
Height: 15.1 in 
Weight: 8.38 lbs

Brand: ASUS

Model: C422AQ

Limited Warranty Full Contract Period: 3 years

Cable Details: 
DisplayPort cable, USB cable, VGA cable, audio cable 
Included Qty : 1

TV Tuner: No

Interfaces:
DVI-D, DisplayPort, USB 2.0, VGA, audio line-in, headphones

Manufacturer: Asus

Question 4

What version of DisplayPort does the monitor support?

Accepted Answer

Version 1.2

Asus Commercial Series C422AQ 21.5 " Black 1920x1080 IPS LED Backlight LCD Monitor 5ms 250cd/m2, Built-in Speakers, Flick Free Technology, Ergonomic tilt with 178° wide viewing angle

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Item#: N82E16824236587