UPS Aviation Technologies Apollo SL70R, Installation Manual

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Serial Interface Specification
Apollo SL70R Installation Manual
29
7. S
ERIAL
I
NTERFACE
S
PECIFICATION
7.1 INTRODUCTION
This section is a specification of the SL70R Mode A/C Transponder serial input and output.
7.2 G
ENERAL
R
EQUIREMENTS
7.2.1
H
OST
I
NTERFACE
The SL70R communicates with a “host” unit such as a navigation computer or a control panel.
Any device connected to the SL70R’s external serial port will be referred to as the “host.”
7.2.2
H
ARDWARE
I
NTERFACE
The SL70R’s external RS-232 port can be found on the 37-pin D sub connector located on the
back of the unit.
7.2.3
B
AUD
R
ATE
The baud rate is fixed at 9600 baud.
Baud Rate: 9600
Data Bit: 8 bits
Stop Bit: 1 bit
Parity: None
7.2.4
C
OMMUNICATIONS
Establishing communications between the SL70R and the host is independent of which device is
turned on first. The SL70R operates in a broadcast mode. Once the startup is finished, the
SL70R will begin sending the appropriate serial data and processing any incoming serial data.
7.2.5
M
ESSAGE
D
EFINITIONS
These messages support the basic operation of the SL70R module.