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MK XXII EGPWS Installation Manual
CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C
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E 4.2.9.1 RS-232 / RS-422 DIGITAL SERIAL BUS INPUTS
Two full duplex RS-232 / RS-422 buses and a third RS-422 receiver are provided at the aircraft interface connectors. The
RS-422 transceivers are electrically multiplexed with the RS-232 transceivers, and are selected through the configuration
process. The third RS-422 receiver is electrically multiplexed with the ARINC 429 channel 1 receiver. The maintenance
RS-232 bus is described in section 0. The specific characteristics (data rate, parity, data bits, stop bits) is defined in the
configuration selection, see Section 5 and 6 for details. RS-422 cable termination will not be required for typical
applications, see TIA/EIA-422-B Annex A.
The RS-232 bus meets the characteristics specified in RS232C and supports the following characteristics:
Data Rate 1200, 2400, 4800, 9600, 19200 or 38400 bits/Sec
Parity None, Odd or Even
Data bits 7 or 8
Stop bits 1 or 2
Maximum Recommended Cable Length 15 meters
Data definition Refer to Section 6 of this document
The RS-422 bus meets the characteristics of TIA/EIA-422-B and supports the following characteristics:
Data Rate 1200, 2400, 4800, 9600, 12000, 19200 or 38400 bits/Sec
Maximum Transceivers on Bus 20
Receiver Input Impedance
12 K
Ω
Word/Frame Structure Refer to Section 6 of this document
Data definition Refer to Section 6 of this document
E 4.2.9.2 GPS RS-232 DIGITAL SERIAL BUS (SERIAL PORT 3)
One port is provided for use with external or internal RS-232 GPS interfaces. This port is common with the GPS RS-422 port
described in Section 0 and can only function as a RS-232 interface or a RS-422 interface but not both.
Pin Assignment (Signal Mnemonic):
Transmit
Receive
Common
J2-45
J2-29
J2-28
(GPS_TXA)
(GPS_RXA)
(GND)
NOTE: If an internal GPS configuration is used (965-1186-0XX, 965-1216-0XX or 965-1590-0XX) then the receive
input will be non-functional.
E 4.2.9.3 GPS RS-422 DIGITAL SERIAL BUS (SERIAL PORT 3)
One port is provided for use with external GPS interfaces. This port is common with the GPS RS-232 port described in
Section 0 and can only function as a RS-232 interface or a RS-422 interface but not both.
Pin Assignment (Signal Mnemonic):
Transmit A leg
Transmit B leg
Receive A leg
Receive B leg
J2-45
J2-46
J2-29
J2-12
(GPS_TXA)
(GPS_TXB)
(GPS_RXA)
(GPS_RXB)
NOTE: If an internal GPS configuration is used (965-1186-0XX, 965-1216-0XX or 965-1590-0XX) then the receive
input will be non-functional.