Emerson E2 - Manual (Page 55)

Battery Testing and Replacement E2 Hardware Setup • 4 - 5
4.3.4.1 LEDs
The plug-in Digital I/O Network card LEDs can be
used to determine the status of normal operating parame-
ters for the card.
4.3.5 E2 RS485 Port Card (P/N
537-4890)
The E2 main board has two RS485 Network channels,
allowing you to connect input and/or output boards via the
RS485 Network. This optional card adds a second RS485
port (COM4) to the E2, allowing a connection to the ISD
compressors, Control Link devices, and other supported
MODBUS devices.
The plug-in RS485 Network card connects to the
power interface board between the two fixed RS485 I/O
Network connectors and the battery.
4.3.5.1 LEDs
The plug-in RS485 Network card LEDs can be used to
determine the status of normal operating parameters for
the card.
4.3.6 Plug-In Four-Channel Inter-
nal Repeater
The four-channel repeater (P/N 832-4830) boosts sig-
nal strength on Echelon Networks. However, the four-
channel repeater is also useful as a means of connecting
the E2 to its associated devices using more than one daisy
chain.
With a four-channel repeater mounted in the E2, you
can run as many as three daisy chain segments out into the
field, each of which can be as long as the prescribed Eche-
lon maximum wire length. The fourth channel of the
repeater can be used to connect other E2s in a separate
daisy-chain, eliminating the need to run cable from the
field back to the next E2.
The plug-in Four Channel Internal Repeater card con-
nects above the power interface board on the case mounts
using standoffs and screws.
See Section 3.4.2.3, Mounting the Four-Channel
Repeater for more information.
4.4 Battery Testing and
Replacement
The 3.6V battery located on the E2 processor board
protects log and alarm data during power loss. It is very
important that each active E2 unit have a battery, and
therefore the E2 has several features that warn you of low
Figure 4-7 - E2 Digital I/O Network Card Install and Wiring
Plug-In Digital I/O
Card LEDs
Status
Red D1 (Out 1) ON: Relay Output 1 is On
Red D4 (Out 2) ON: Relay Output 2 is On
Table 4-2 - LED Status for Plug-In Digital I/O Card
E2 Power Interface Board (PIB)
COM 1 COM 2
OU
T P U T # 1
OU
T P U T # 2
IN
P U T #
1
IN
P U T #
2
E2 Plug-In
Digital I/O
Network Card
Input and Output Wiring
NORMALLY
OPEN
NORMALLY
CLOSED
RS485 Plug-In
Card LEDs
Status
Yellow D5 (RX1) ON: Communication is being
received on RS485 Port 2A
Yellow D2 (RX2) ON: Communication is being
received on RS485 Port 2B
Red D1 (TX) ON: Communication is being
sent on RS485 Port 2A and
2B
Table 4-3 - LED Status for RS485 Plug-In Card
WARNING: Fire, explosion, and severe burn
hazard. Do not recharge, disassemble, heat
above 212°F (100°C) incinerate, or expose
contents to water.
Battery replacement should only be performed by a
qualified, trained technician.