Emerson E2 Manuel D’Utilisation

The PIB interfaces the power and most all communica-

tions with the main board, and contains all field wiring 
connections.

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. 

Emerson 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.

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. 

There is one set of RS485 jumpers for each RS485 port 

(COM2A-2B; COM6; and COM4A-B). Jumpers J8-J10 
are located directly above the COM2A connector port, and 
jumpers J11-J13 are located directly above the COM2B 
port. The RS485 termination jumpers (J8-J22) are used to 
terminate the devices at the beginning and end of an 
RS485 Network. If the E2 is the beginning of all RS485  



I/O or MODBUS Networks, all three of these jumpers 

should be set to the UP position. For MODBUS, the jump-
ers should all be in the top-most position (MOD). For I/O 
Net, the jumpers should be in the middle position (I/O). 
For no termination, set the jumpers to the down position 
(NO). 

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. 

There is one Echelon jumper (J2) located on the Eche-

lon board that plugs into the main processor board.

Additional information about Echelon Networking and 

terminating the network can be found in Section 8.3, Ech-
elon Network Structuring (Daisy-Chains).

The E2 has many plug-in card options to choose from: 

• Plug-in Echelon card with mounting screw

• RS485 Modem/communication expansion card

• Plug-in digital I/O Network card

• Plug-in Four-Channel Internal Repeater

Echelon Plug-In Card Kit 

Echelon is a two-conductor network that interconnects 

E2s and other associated devices. All Echelon devices are 
wired together using the daisy-chain method of network 
structuring. For the E2 to communicate on the Echelon