Honeywell MKXXII installation manual 2.9.1 RS-232 / RS-422 Digital Serial BUS Inputs

Honeywell

MK XXII EGPWS Installation Manual

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 KΩ
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	J2-45	(GPS_TXA)
Receive	J2-29	(GPS_RXA)
Common	J2-28	(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	J2-45	(GPS_TXA)
Transmit B leg	J2-46	(GPS_TXB)
Receive A leg	J2-29	(GPS_RXA)
Receive B leg	J2-12	(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.

CAGE CODE: 97896 SCALE: NONE SIZE: A DWG NO: 060-4314-225 REV: C SHEET 173