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General Information
S
I
1.2.2
YSTEM
NTERFACES
1.2.2.1 S
I
ERIAL
NTERFACE
The SL70R includes an RS-232 serial port which is used to control the transponder from
a host.
When making serial connections to the SL70R, use a shielded two or three conductor ca-
ble. Make the RxD, TxD, and serial ground connections on the 37 pin D-sub connector.
Connect the shield to the rear of the mounting frame on the connector plate.
H
F
1.2.3
OST
AILURE
If the host stops sending altitude data to the SL70R, or upon power up if the SL70R does
not receive data from the host, then within 60 seconds the SL70R will enter Host Failure
Mode. In this mode, the SL70R will revert to altitude reporting (Mode C) using the cur-
rent squawk code. If the power is cycled the squawk code will revert to the default VFR
squawk code.
If the SL70R is configured for gray code altitude input, the transponder will continue to
transmit altitude data. If the SL70R receives altitude data from the host, in the event of
host failure, no altitude data will be transmitted.
If the host resumes normal operation, the SL70R then reports Mode C operation to the
host and altitude reporting resumes if valid serial data is supplied from the host.
1.3 S
PECIFICATIONS
This section includes detailed electrical, physical, environmental, and performance speci-
fications for the Apollo SL70R.
E
1.3.1
LECTRICAL
P
(A
1.3.2
HYSICAL
2
Input voltage ............. 10VDC to 35VDC, reverse polarity protected
Input current.............. 500mA typical, 1.4A max at 14VDC
Input power ............... 7 watts typical (8 pulse reply, 200 replies / second)
Internal fuse............... 3 amp slow blow (UPS Aviation Technologies
Memory backup ........ Internal EEPROM
V
I
S
IEWED
NSTALLED
Width................................................. 1.30 inches (3.30 cm)
Height................................................ 6.875 inches (15.88 cm)
Depth ................................................. 11.452 inches (29.09cm)
Weight (with mounting frame).......... 2.2 lb. (0.998 kg)
270mA typical, 660mA max at 28VDC
20 watts max (12 pulse reply, 1200 replies / second)
5.8 watts standby
#S172-0007-012)
)
Apollo SL70R Installation Manual
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