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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

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 K

Ω

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.