Tait T2000-A76, Operation Manual

Page: 23 / 30

March 2003 M2303-00-P00-805 23
[DATA]
The [DATA] field contains either an AVL Report or other data dependent on the type of acknowledgement
being sent. Refer to the previous table for acknowledgement details.
AVL Report
Note: If no AVL data is received within 20 seconds or a format error occurs in the RMC data (incorrect check-
sum), then the AVL report is not send. Bits 0 and 1 in the [RESPONSE] are set to 10 or 11 and only the response
and the radio ID bytes are sent.
Note: If a digit is not convertible to BCD, then its value is set to ‘F’.
[AVL_REPORT] MSB LSB Description
Byte 2 Radio ID ‘1’ Radio ID ‘2’ four digit BCD number - last four digits of
radio ID from configuration database
Byte 3 Radio ID ‘3’ Radio ID ‘4’
Byte 4 1 HH HH: Hour - two digit BCD number
Byte 5 1 MM MM: Minute - two digit BCD number
Byte 6 1 SS SS: Second - two digit BCD number
Byte 7 1 F Ld F: Latitude Ref bit 4: 0=N, 1=S
bit 5: 0=E, 1=W
Ld: Latitude degrees - two digit BCD number
Byte 8 Ld 1 Lm Ld: Latitude degrees cont.
Lm: Latitude minutes - two digit BCD number
Byte 9 Lm Ls Lm: Latitude minutes cont.
Ls: Latitude decimal points - two digit BCD
number
Byte 10 Ls Ls: Latitude decimal points cont.
Byte 11 1 0 1 Gd Gd: Logitude degrees - three digit BCD
number
Byte 12 Gd 1 Gm Gd: Longitude degrees cont.
Gm: Logitude minutes - two digit BCD
number
Byte 13 Gm Gs Gm: Longitude minutes cont.
Gs: Logitude decimal - three digit BCD
number
Byte 14 Gs Gs: Logitude decimal cont.
Byte 15 1 0 DD DD: Day - two digit BCD number
Byte 16 Vk Vk: Speed over ground (knots) - three digit
BCD number
Byte 17 Vk Vp Vk: Speed over ground cont.
Vp: Speed over ground decimal - one digit
BCD number