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SYSTEM DESCRIPTION AND INSTALLATION MANUAL
Figure 3-7. HSU Maintenance Connector (X1) Pin Layout
Table 3-1. HSU X1 Connector Pin Assignments
Pin
1
Not Used
2
CMT1 RXD Output (EIA/TIA--232--E)
3
CMT1 TXD Input (EIA/TIA--232--E)
4
CMT2 Interface Disable Input
5
CMT1 GND (EIA/TIA--232--E)
6
CMT1 --12VDC (to pull down pin 4)
7
Not Used
8
Not Used
9
Not Used
(3) HSU X2 Connector
(a) The HSU rear panel X2 connector is an interface to aircraft and SATCOM
interconnections. The X2 connector is an ARINC 404 shell size 2 receptacle
connector. The layout of the HSU X2 connector is shown in Figure 3-8. Table 3-2
gives the pin assignments of the X2 connector.
(b) The HSU disable input is used by the SDU to reset and inhibit the transmitter
output signal from the HSU. The ARINC 429 interface is used by the SDU to
control the HSU. The HSU operates as a slave to the SDU. The interface is a
100 kbps high speed ARINC 429 receive and transmit data bus to/from the SDU.
The HSU transmits and receives simultaneously on the two ARINC 429
channels.
(c) The CMT2 interface (pins 5, 6, and 7) has a Baud rate of 9,600 bps fixed. There
are eight data bits and one stop bit with no parity.
Use or disclosure of information on this page is subject to the restrictions in the proprietary notice of this document.
HS--700 High Speed Data System
Signal Name/Description
23- -20- -33
Page 3--7
30 Aug 2002
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