User's Guide
Table Of Contents
- Introduction
- System Description
- System Operation
- Testing and Fault Isolation
- Maintenance and Repair
- Appendix A: Return Material Authorization
DRAFT
Page 3-6
17 Mar 2016
23-15-87
© Honeywell International Inc. Do not copy without express permission of Honeywell.
SYSTEM DESCRIPTION, INSTALLATION, AND MAINTENANCE MANUAL
ARINC 781-500 SDU and SCM
B. SCM
The SCM uses a 15-pin D-type male connector and locking screws. Pin assignments are compliant
with ARINC Characteristic 781 and shown in Table 3-3.
Table 3-2. SDU Front Connector DSUB and RJ45 Pin Assignment
9S DSUB Pin Number Description RJ45 Pin Number Description
1NC1RX+
2TX2RX-
3RX3TX+
4NC4NC
5GND5 NC
6NC6TX-
7NC7NC
8NC8NC
9NC
Table 3-3. SCM D-Type Connector Pin Assignment
Pin Number Description
1 Data to SDU A (RS422)
2 Data to SDU B (RS422)
3 Data from SDU A (RS422)
4 Data from SDU B (RS422)
5 Reserved - RS232 Gnd (used for shop loading)
6Spare
7 Chassis Ground
8 Power Input +8 V to +15 V
9 Reserved - Enable RS232 (used for shop loading)
10 Reserved - 0 V strap output (used for shop loading)
11 Spare
12 Reserved - RS232 Tx (used for shop loading)
13 Reserved - RS232 Rx (used for shop loading)
14 Spare
15 Power Return 0 V
DRAFT as of
4 Mar 2016