User's Manual

SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
eNfusion® HSD-440 Mark 2 Terminal
23-15-30 F-8
3 JUN 10
C. Understanding General Format Iden
tifier (GFI) Definitions
Table F-7 defines the GFI definitions.
Table F-7 GFI Definitions
File Type
To
GFI
CMU
HSD-4
40 Mark 2
Terminal
Label
Destination
Co
de
Label
Destination
Co
de
Data 2 enveloped message 304 M 307 (1) S 1110b (Eh)
A GFI of 1110 b indicates a data 2 Enveloped ACARS Message.
This message indicates
to the HSD-440 Mark 2 Terminal that this message is to be passed on through the ACARS
network. Only one message is transferred per link layer ARINC 429 file. If the HSD-440
Mark 2 Terminal is unable to deliver an enveloped message to its destination (CMU or
GES), the HSD-440 Mark 2 Terminal discards the message.
A data-2 HSD-440 Mark 2 Terminal transmits to the GES all messages passed from the
av
ionics network interface during the time that the HSD-440 Mark 2 Terminal is logged
on. If the HSD-440 Mark 2 Terminal is not logged on, any messages passed to the
HSD-440 Mark 2 Terminal shall be discarded. While the HSD-440 Mark 2 Terminal is
logged on, any messages received from the GES shall be forwarded to the avionics
network interface regardless of the state or availability of the destination avionics
equipment.
Any CMU message contains a destination code of M if it arrives from the ground to the
CMU.
Similarly, any message originating from the CMU that is destined for a GES
contains a destination code of S. These codes are embedded in the RTS, CTS, and
NCTS protocol words (See "Understanding Protocol Words" on page F-9).
7. Understanding Word Types
The word types in Table F-8 are valid. For a full definition, see ARINC 429 P3, attachment 11.
Table F-8 Word Types
31 30 29 WORD TYPE
0 0 0 Full Binary Data Word
0 0 1 Partial Binary Data Word
0 1 0 Start of Frame—Version 3
0 1 1 End of Frame—Version 3
1 0 0 Protocol Word
1 0 1 Solo Word
1 1 0 Start Of Transmission—Version 1
1 1 1 End Of Transmission—Version 1