FreeFlight 2101 I/O PLUS, Installation And Checkout Manual

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Page 2-4
Revision E
May 31, 2006
FreeFlight 2101 I/O Approach Plus GPS Navigation System
2.3.4 Receiver/Display Unit Installation
2.3.4.1 Unit Installation
Select a mounting location that will allow easy viewing of the unit's display during normal instrument panel scan
and allow easy access to the front panel controls. After the desired mounting location is identified, refer to Figure
2-6 for unit outline and mounting dimensions. Relocate existing equipment as necessary.
2.3.4.2 Placard Use
Placard use is dictated by the particular installation. The installation agency is required to fabricate a
placard to label the annunciators, transfer switches, and circuit breakers.
2.3.4.3 J1 Wiring Notes
The external wire supplied by the installing agency should be MIL-W-16878E/4 or equivalent 22 gauge with the
exception of the serial communication connections (pins 2, 5, 7, 8, 9, 18, 23, 24, 29, 35, 36, and 37). Serial
communication connections require 22 gauge twisted shielded pairs. Refer to pin-out diagram Figure 2-1. For
CDI/HSI Interconnections, refer to Figure 2-10. For Serial Port Interconnections, refer to Figures 2-12 through
2-14.
These considerations should be followed to ensure proper interface.
A. Audio output (pin 13). Audio Common (pin 32) is common for AURAL ALERT. For KMA20 Audio panels,
install a 620
Ω
±10%, 1/4W resistor in series with the audio output. Refer to Figure 2-11.
B. The Message annunciator (MSG), pin 14, Hold annunciator (HLD), pin 15, Waypoint Alert annunciator
(WPT), pin 28, and Approach annunciator (APR), pin 30 duplicate the annunciators on the front panel.
These pins are connected to open-collector transistors which will sink a maximum of 200 mA. If they are
connected to a relay for higher current capability, the relay must have a protection diode placed across
the coil. The pins sink current when the annunciator condition is true.
C. Serial Port 1 (pins 5, 7, 8, and 37) and Serial Port 2 (pins 9, 23, 24, and 36) are designed for signals
adhering to the RS-422 standard. Direct RS-232 output is available via the Bipolar ports, see D.
D. Bipolar Serial Port 1 (pin 6) and Serial Port 2 (pin 10) are single-ended RS232 signals . This signal must
be the same format as the corresponding serial output port (e.g., if Serial Output Port 1 is configured for
K0 at 9600 baud, so will Bipolar Output Port 1).
E. Serial Port 3 (pins 2, 4, 18, 29, and 35) is reserved for Differential GPS (DGPS) operations. Do not use
these communication ports for peripheral interface operations.
F. Only a single device may be connected to each serial input port (RXD1 and RXD2). Up to 5 devices may
be connected in parallel to each serial output port (TXD1 and TXD2), provided that all devices in parallel
use the same message format and data rate (e.g., K0 at 9600 baud).
G. The ONE PPS (pin 12) is a TTL pulse occurring once per second. When GPS time is available, the leading
edge of ONE PPS is synchronized to GPS time within 1 ms.
H. Pin 26 is a 14 Vdc or 28 Vdc Superflag driver.
CAUTION:
Do not connect pin 26 directly to GND.