The Datalink system is made of 2 distinct parts;
The Datalink can use two methods of communication;
To use Hoppie a log on code is required that can be obtained from here, this code is not required to send messages using the frequency. The Code shall be entered at login, the field is displayed by pressing the cog and the field will be displayed as shown below;
Telex/DLC is used for normal messages and clearances but is not used for airborne instructions or clearances.
To send these message first select Datalink and then the aircraft the message is for. The D-Link window will now populate and two columns of groups will be present on the right of the window. Most groups are CPDLC but there will be one field at the bottom labelled DCL, by selecting this it will open the Telex fields.
In the centre of there window, there are lines of pre-written parts that can be added to construct the message. Some of the fields contain “XXX” and in most this will be replaced with the information from the aircraft tags. If required it is possible to add, remove and edit the text in the message section to the left of the window. Once the message is ready this may be sent by pressing the send button, this will attempt to send the message via Hoppie but if not possible this will be sent via the “Frequency”.
Messages may be created and not sent, by selecting another aircraft a new message box will display but selecting the original aircraft will show the unsent message. This allows messages to be pre-written while being able to continue using the system before sending the message.
Once the message has been sent the text will become orange, please note that you will not see the message on the frequency but it has sent.
CPDLC with Hoppie requires a “Connection” with the pilot, if this connection is not achieved the message will be sent via the frequency instead.
A Hoppie connection will be initiated by the pilot, when this happened as the audible sound is played (If on in the sound settings) and CPDLC will flash in red above the pilot's tag.
Using the right mouse button on the aircraft will bring up a menu with CPDLC, you have 5 options- ACCEPT LOGON, STANBY., REQUEST DEFERRED, UNABLE, UNABLE DUE TRAFFIC and UNABLE DUE AIRSPACE.
Once the connection is accepted a + symbol will be displayed in front of the callsign.
Selecting an aircraft will show the CPDLC page on the D-link window. There will be 5 lines on the left and each one can contain one of the pre-programmed messages that are created for the sector file, see Datalink Sectorfile. There will be up to 20 category's with the last one normally being for telex (See above).
To create the message select the line and then select the category for the message and this will display the list of pre-written messages, selecting one of these will automatically add this to the line selected. Parts of messages will be modifiable such as flight level speeds and waypoints. This data will be taken from any tags that have been prefilled or can be manually selected via the Datalink system.
Once the message is sent the text will turn orange, you can clear the lines by pressing the X to the left of each line.
It is possible to prepare a CPDLC message and save it to send later, as the D-Link screen is by callsign.
Sending a message via Hoppie is the same as above but the sent message will be displayed in the bottom left of the D-link window. Nearly all the CPDLC messages have a default set of replies that the pilots may use, see Datalink Sectorfile, for more information.
Each set of the message will have an ID number and when a pilot replies you will see the reply in the bottom left with the same ID. To send a reply to a message, therefore keeping the same ID, you can select one of the previous messages. This will highlight all the provide messages of that ID and any message sent will be sent under this ID.