6.10 REAR COMMUNICATION BOARD
Figure 22: Rear communication board
The optional communications board containing the secondary communication ports provide two serial
interfaces presented on 9 pin D-type connectors. These interfaces are known as SK4 and SK5.
SK4 can be used with RS232, RS485 and K-bus. SK5 can only be used with RS232 and is used for
InterMiCOM communication.
The second rear communications board and IRIG-B board are mutually exclusive since they use the same
hardware slot. The board comes in two varieties; one with an IRIG-B input and one without.
MiCOM P747 Chapter 3 - Hardware Design
P747-TM-EN-1 51
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