Installation manual

Environmental Qualifications

Apollo MX20 Installation Manual

APPENDIX A – I/O SPECIFICATIONS

This appendix includes the RS-232 serial port interface specifications.

6.1 MOVING MAP INPUT

The format of the moving map data output is as follows. Definitions of the input data is included in

Table 11 and Table 13. A sample output message is included in Figure 21.

Baud rate: ............................................... 9600

Data bits: ................................................ 8

Stop bits: ................................................ 1

Parity: ..................................................... none

Output rate: ............................................ approx. 1 seconds

Message length: ..................................... variable, approx. 83 to 484 characters

The serial output messages are in the following format.

<STX> ................................................... ASCII “start of text” character (1 byte, 02h)

<id> ........................................................ item designator (1 byte, from following table)

<data> .................................................... item data (format listed in following table)

<it> ........................................................ item terminator (1 byte, 0Dh)

<ETX> ................................................... ASCII “end of text” character (1 byte, 03h)

Table 11 - Moving Map ASCII Navigation Data

ID Data Format Length Description

A sddmmhh 9 Present latitude

s =sign: N for north, S for south

dd = degrees

mm = minutes

hh = hundredths of minutes

B sdddmmhh 10 Present longitude

s = sign: E for east, W for west

ddd = degrees

mm = minutes

hh = hundredths of minutes

C ddd 3 Track (magnetic): ddd = degrees

D ddd 3 Ground speed: ddd = knots

E ddddd 5 Distance to active waypoint: ddddd = nm x 10

G sdddd 5 Cross track error:

s = sign: R for right, L for left of course

dddd = distance off course, hundredths of nm

I dddd 4 Desired track (magnetic):

dddd = degrees x 10

K ddd[dd] 3 to 5 Active waypoint identifier:

ddd[dd] = ASCII waypoint identifier

L dddd 4 Bearing to active waypoint (magnetic):

dddd = degrees x 10

Q sddd 4 Magnetic variation: