Honeywell ControlEdge 900R04-0200 Getting Started page 36

Chapter 3 - Hardware
Item Description
1 18-30 VDC power supply
2 Right expansion connector: connects to an expansion I/O module.
3 Screw holes: used for locking left end plate and expansion I/O IOTA.
4, 5 Ethernet port 1 and Ethernet port 2: extends the I/O link to another row.
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ATTENTION: Two ports of the last right end plate should be
connected with a termination cable to complete ring formation.
Left End Plate
Left end plate is used only in multi-row ControlEdge 2020 systems for
the IOM power supply and Ethernet connection. Left end plate has an
18-30 VDC Power Input, two Ethernet ports and a right expansion
connector, as numbered in the following picture.
Figure 3-14: Left End Plate