BMTW-SVN01F-EN 37
Chapter 3
BCU I/O Module
The BCU input/output (I/O) module is an optional board that adds capa-
bilities for five universal inputs (UIPs) and one binary output (BOP) to
the BCU.
Each UIP can be configured for any of the following:
• Binary (switches or outputs)
• Current (0–20 mA)
• Pulse meter (water, gas, and electric)
• Temperature sensor (Trane thermistors)
• Voltage (0–10 Vdc) inputs
Both the hardware jumper selection and the software configuration set
the UIP type.
A BOP has been included in the BCU I/O module to provide a convenient
single output. The BOP can be used to control equipment or provide sta-
tus information such as an alarm condition.
BCU I/O Module Installation
Install the BCU I/O module into the BCU enclosure. Refer to Figure 2 on
page 4 for BCU I/O module installation location. Two posts and two
screws secure the board into the back of the enclosure.
A RJ45 cable is provided to connect the BCU I/O module to the BCU.
Refer to Figure 2 on page 4 for RJ45 connector locations and cable dia-
gram. The BCU will communicate with and provide power to the BCU I/O
module through this cable.
I/O Wiring
All wiring must conform to national and local electrical codes. Analog wir-
ing should not exceed a run length of 300 ft (91 m). Binary wiring should
not exceed a length of 1,000 ft (305 m). If the recommended lengths are
exceeded, the wire may pick up EMI/RFI, which would affect operation of
the BCU I/O module.
For input and output wiring, Trane recommends using a plenum wire
that is 18–22 AWG (1.02–0.643 mm
2
) shielded, twisted-pair wire. Each
conductor is stranded, tinned copper. Only one end of the shielded wire
should be grounded. At the BCU end, connect the wire’s shield to the neg-
ative lead input. On the other end of the wire, cut back and tape the
shielding.
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