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SA/FC bus terminal block
You can connect an IOM to an SA bus or an FC bus, but not to both buses simultaneously. The SA/FC bus terminal
block is a removable, 4-terminal plug that fits into a board-mounted jack.
When you connect the IOM to an FC bus, wire the bus terminal block plugs on the controller and the other
controllers in a daisy-chain configuration using 3-wire twisted, shielded cable as shown in Figure 4. See Table 6 for
more information.
When you connect the IOM to an SA bus, wire the bus terminal block plugs on the controller and other SA bus
devices in a daisy-chain configuration using 4-wire twisted, shielded cable as shown in Figure 5. See Table 4 for
more information.
Note: The SA PWR/SHLD terminal does not supply 15 VDC. The SA PWR/SHLD terminal is isolated and you can
use the terminal to connect (daisy chain) the 15 VDC power leads on the SA bus (Figure 5) or the cable shields on
the FC bus (Figure 4). The SA bus supervisor advanced application field equipment controller (FAC), field
equipment controller (FEC), or VAV modular assembly (VMA) supplies 15 VDC to devices on the SA bus that
require power.
SA/FC bus port
The SA/FC bus port on the front of the controller is an RJ-12, 6-position modular jack that provides a connection for
devices on the SA bus, a Wireless Commissioning Converter, ZigBee® wireless dongle, or a ZFR1811 Wireless
Router, depending on which bus the IOM is operating on.
Figure 4:
FC bus terminal block wiring
Terminating Device
on FC Bus Segment
FC Bus
Terminal
Block Plugs
Stranded 3-Wire Twisted Shielded Cable
Figure 5:
Terminating Device
on SA Bus
Stranded, 4-Wire (2 Twisted Pair) Shielded Cable
(One twisted pair is the
The second pair is COM and SA PWR.)
PEAK® IOM57 Input/Output Modules Installation Instructions
Daisy Chained Device
on FC Bus Segment
Isolated Shield
Connection
To Next
Device on
the FC Bus
Segment
SA bus terminal block wiring
Daisy Chained Device
on SA Bus
SA Bus
Terminal
Block Plugs
To Next
Device on
the SA Bus
+
and leads.
-
6
Terminal
To Next
Device on
the FC Bus
Segment
Cable Shield
Connection
To Next
Device on
the SA Bus
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