Honeywell
MK VI MK VIII EGPWS Installation Design Guide
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4.2.5 ARINC 429/575 Digital Serial Bus Inputs
Quantity 8
Format DITS, ARINC 429/575 Low or high speed 1
Low Speed Data Rate 12.0 KBPS to 14.5 KBPS
High Speed Data Rate 100 KBPS ± 1%
Direction of Information Flow Type ‘A’ broadcast for ARINC 429/575
Word/Frame Structure Type ‘B’ 32 bit words consisting of 8 bits label and 24 bits data/status
Data definition Refer to Section 6 of this document
Channel
Receive #1 A leg
Receive #1 B leg
Receive #2 A leg
Receive #2 B leg
Receive #3 A leg
Receive #3 B leg
Receive #4 A leg
Receive #4 B leg
Receive #5 A leg
Receive #5 B leg
Receive #6 A leg
Receive #6 B leg
Receive #7 A leg
Receive #7 B leg
Receive #8 A leg
Receive #8 B leg
Pin Assignment
J2-37
J2-36
J2-39
J2-38
J2-41
J2-40
J2-25
J2-8
J2-21
J2-4
J2-22
J2-5
J2-23
J2-6
J2-24
J2-7
(Signal Mnemonic):
(429/422RX_1A)
(429/422RX_1B)
(429RX_2A)
(429RX_2B)
(429RX_3A)
(429RX_3B)
(429RX_4A)
(429RX_4B)
(429RX_5A)
(429RX_5B)
(429RX_6A)
(429RX_6B)
(429RX_7A)
(429RX_7B)
(429RX_8A)
(429RX_8B)
SSM/SDI Definition: Refer to Section 6.2 of this document
4.2.6 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 4.3.1. 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
1 The bus speed is defined in the configuration selection, see Section 5 for details.