Main Processor Board (Previous Version); Power Interface Board; Powering The E2; Rs485 Ports - Emerson E2 Installation And Operation Manual

4.1.3 Main Processor Board (Pre-
vious Version)
Figure 4-3
- E2 Main Board (Previous Version P/N 237-4800)
4.1.4

Power Interface Board

Figure 4-4
- Power Interface Board
The PIB interfaces the power and most all communica-
tions with the main board, and contains all field wiring
connections.
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4-2 E2 RX/BX/CX I&O Manual
4.2

Powering the E2

Starting at the lower right side of the PIB, the first plug
is the 24VAC input. This must terminate into the power
supply transformer.
E2 requires 24VAC Class 2 power, which is supplied
by a non-center-tapped Class 2 transformer.
Retail Solutions supplies two transformers that may be
used to power E2s: one for use with 110VAC (P/N 640-
0041), and one for use with 220VAC (P/N 640-0042).
Both transformers are rated at 50VA, and each will power
one E2 unit.
4.2.1

RS485 Ports

On the lower left side of the PIB are two RS485 Net-
work connector ports. This is where all I/O boards (except
the case controllers, TD3, ESR8, and Echelon I/O boards)
are connected.
4.2.2

RS485 Jumpers

There is one set of RS485 jumpers for each RS485
port. Jumpers JP1-3 are located directly above the first
connector port, and jumpers JP4-6 are located directly
above the second connector port. The RS485 termination
jumpers (JP1, JP2, JP3, JP4, JP5, and JP6) are used to ter-
minate the devices at the beginning and end of an RS485
Network. If the E2 is the beginning of all RS485
I/O Networks, all three of these jumpers should be set to
the UP position.
4.2.3

Echelon Network Connect

The next connector is the Echelon Network plug. The
one connector handles both input and output connections.
The input and output cables are connected directly to the
Echelon plug. This plug is the connection to the Case Con-
troller (CC-100), the Evaporator Stepper Regulator board
(ESR8), TD3s, and other E2s.
4.2.4

Echelon Jumpers

The two Echelon jumpers (JP7 and JP8) are located
next to the Echelon Network port.
Additional information about Echelon Networking and
terminating the network can be found in Section 8.3, Ech-
elon Network Structuring (Daisy-Chains).
026-1610 Rev 12 25-APR-2011