Garmin GNC 420 - Manual (Page 222)

GNC 420(A) Pilot’s Guide and Reference 11-32
SECTION 11
ADDITIONAL FEATURES
190-00140-20 Rev. K
Monitoring the Data Link
The Data Link Status Page provides an indication of
the integrity of the Data Link. The Data Link Page allows
the pilot to monitor the system and determine the possible
cause of a failure.
View the Data Link Status Page:
1) From the AUX Page Group, select the Data Link
Page.
2) Highlight ‘Data Link Status’ and press the ENT
Key.
3) The Data Link Status Page (Figure 11-47) is
displayed.
Figure 11-47 Data Link Status Page
The GDL 49 Datalink Status Page shows the following
fields:
• TX Queue - Shows the number of requests in the
GDL 49’s transmit queue waiting to be sent to the
satellite.
• RX Queue - Shows the number of responses in the
GDL 49’s receive queue waiting to be sent to the
GNC 420.
• Sat ID/Connectivity - Shows the current satellite
in view and also indicates the status of the current
satellite connection. See Table 11-8.
SAT ID/CONNECTIVITY FIELD
MESSAGE DESCRIPTION
‘_ _ _’ RS-232 communication with the GDL
49 has been lost.
‘Data Link has
failed’ There is a disconnect inside the GDL
49.
‘Linked to sat’ Can exchange data with the satellite.
‘Satellite in view’ Found satellite but have not yet
identified it.
‘Searching...’ No satellite is currently in view.
Table 11-8 Sat ID/Connectivity Field
• SATCOM Operation - This field indicates the
current activity being performed by the satellite
communicator within the GDL 49. Table 11-9
lists the messages that can be displayed, including
interpretations of the most common ones:
SATCOM OPERATION FIELD
MESSAGE DESCRIPTION
‘_ _ _’ Unknown task is being performed,
or RS-232 communication with the
GDL 49 has been lost.
‘Idle’ Waiting to perform the next task.
‘Receiving
message’ Receiving a response from the
satellite.
‘Sending message’ Transmitting a message.
‘Sending request’
Transmitting a request to the
satellite.
Table 11-9 SATCOM Operation Field
• SATCOM SER NUM - This field shows the serial
number assigned to the GDL 49’s internal satellite
communicator.
• GDL SW - This field shows the currently installed
software version for the GDL 49.