Rockwell Automation Publication 2711R-UM001H-EN-E - April 2021 89
Chapter 5
Virtual Network Computing
Virtual Network Computing
(VNC)
Virtual Network Computing (VNC) allows you to remotely connect to a
PanelView 800 terminal, either over the local network or the Internet. With
VNC you can interact with the terminal without having to be physically at the
terminal location. It transmits keyboard and mouse actions from your
computer to the terminal.
Guidelines for Using VNC
• We recommend that you enable only the view-only access to the
terminal. Enabling control access increases the security risk if the
password is compromised.
• Only one active VNC connection is supported and the terminal will reject
additional connection requests.
• For better performance when using VNC, we recommend that you use a
100 Mbps connection. Using a 10 Mbps connection may result in lower
performance, such as a slower refresh rate.
• If you are using a VNC Viewer application that supports configurable
refresh rate, set the minimum refresh rate to 500 milliseconds.
• Terminate the VNC connection before performing a firmware update as
it may interfere with the process.
• You cannot calibrate the touch screen using VNC. If you have triggered
the calibration process, you can press the “ESC” key on the keyboard to
cancel the procedure.
• The mouse action “Press and hold” is not supported over VNC.
Recommended VNC Clients
and Settings
There are many VNC viewer applications you can use to connect with the
terminal. These are the recommended VNC clients for use with PanelView 800
terminals.
Recommended VNC Clients and Settings
Client Name Remote Connection Type Recommended Settings
Tight VNC PC/Laptop – Windows 7
Change Preferred Encoding from “Tight” to “Hextile” for
smoother screen switching.
Real VNC
Mobile and Tablet – IOS None
Mobile and Tablet – Android None
PC/Laptop – Windows 7
• Change Color Level from “pal8” to “Full” for a clearer
display.
• Change Security Notification Timeout from “2500” to
“0” in the client options.
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