Installation manual

Serial Interface Specifications

62 Apollo GX50/60/65 Installation Manual

FUEL / AIR DATA COMPUTER INPUT

The fuel / air data input is used to input fuel flow and airdata computer information from the

Shadin ADC-200 fuel / air data computer.

The format of the fuel / air data computer input is as follows, which conforms to the Shadin

“S” format serial message. Definition of the input message data that the GX50/60/65 uses is

included in Table 12. A sample input message is illustrated in Figure 21.

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

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

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

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

Expected input rate: ......................... approx. 1 second

Message length: ................................ variable (512 character max.)

The serial input message string is expected in the following format.

<STX>............................................... ASCII “start of text” character (STX = 02h)

<message>......................................... starts with an ASCII “S”, then an ID character,

followed by the message data, a carriage return (CR

= 0Dh), and a line feed (LF = 0Ah) See the

following table.

<checksum> ...................................... the message checksum, same format as message

<ETX> .............................................. ASCII “end of text” character (ETX = 03h)

Altitude Sign Altitude in Feet

Temperature Sign Example 1

Altitude Encoder/ Internal Temperature

Converter Identifier Message Checksum

210 feet above sea level (@29.92 gh)

#AL +00210T+25D4 with temperature of 25°C

Altitude Sign Altitude in Feet

Temperature Sign Example 2

Altitude Encoder/ Internal Temperature

Converter Identifier Message Checksum

45 feet below sea level (@29.92 gh)

#AL -00045T+45DE with temperature of 45°C

Status Code Example 3

Message Checksum

Indicates encoder is warming up

#AL -09980T+12E9 (is still below +25°C)

Figure 20 Altitude Data Input