2.3 Rear Panel Connectors and Identification
9
2.3.6
IRIG-B Timing Output
The Model 1133A has one high-drive, unmodulated IRIG-B, timing output that uses a terminal
connector as seen in Figure 2.9. This output may also be “Tee’ed” for parallel-connected loads.
For more information concerning how to connect any timing output in parallel, for distribution,
see Section 3.5 and Appendix C.
Figure 2.9: IRIG-B Connector
2.3.7
Communication Ports
The Model 1133A has two identical communication ports with your choice of RS-232, RS-485 or
modem, and one Ethernet port (illustrated in Figure 2.10). Generally, for RS-232 communications,
you will only need pins 2, 3 and 5 using a null-modem cable. For more information, see Chapter 3,
Section 3.6.1 on the serial interface, Chapter 6 on page 42 for connecting basics, and Section 12.8.2
for specifications.
Figure 2.10: Communication Ports Connec-
tors
2.3.8
Form C Contacts
The Model 1133A has four sets of Form C relay contacts (illustrated in Figure 2.11) that have
three contact points: Normally Open (NO), Normally Closed (NC) and Common (C), where the
”normal” condition means the 1133A powered OFF. For information on how to connect to them
and their specifications, see Chapter 3, Section 3.3, Relay Contact Outputs.
Figure 2.11: Relay Contact Connector
