Document Part # 026-4703 Rev 8 10-JUN-2009
Page 6 of 18
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Installation Instructions: Control Link ACC Anti-Condensate Controller System
technical bulletin
The sensor is supplied with an 8-foot cable, with a Molex connector. Plug the connector into the
matching socket at the bottom of the Control Link ACC enclosure.
Network Wiring and Configuration
If each Control Link ACC will be configured with its own dewpoint sensor, it is not necessary to
network the Control Link ACC together. However, when networked, multiple Control Link ACC
controllers may use a single dewpoint sensor. Furthermore, because the Control Link ACC is a
MODBUS-compliant device, a site controller can be programmed to communicate with the Con-
trol Link ACC controllers via MODBUS, supporting remote configuration and data acquisition.
The E2 controller supports networking of up to 63 Control Link ACC controllers.
Network Connection to E2
Connecting a Control Link ACC to an
E2 unit requires the E2 to be version
2.71 or above. Contact Retail Solutions
for upgrade information if the controller
is a version before 2.71.
An E2 has up to three COM ports that
can be assigned for MODBUS commu-
nication (COM2, an RS485 port on the
E2 power interface board, and COM4
and COM6, which are optional ports
requiring expansion cards). COM ports
can only be used for one function; in
other words, if COM2 is set up as the
I/O network, you cannot connect MOD-
BUS devices to COM2. Ensure your E2
is equipped with an RS485 COM Card
(
P/N 637-4890
) and configured in E2
General Services (
I
,
Serial
tab)
to enable COM4 or an E2 Expansion COM Card (
P/N 637-4871
) to enable COM6.
Connect the MODBUS network cable to the three-terminal connector on the COM port you wish
to assign as MODBUS. Like other Control Link connections, wire RS485+ to RS485+, RS485- to
RS485-, and the shield cable to the middle terminal. If the E2 will be the first device in the daisy-
chain, set the port’s termination jumpers to the TERMINATED & BIASED position (all three
jumpers UP); otherwise, set all jumpers DOWN if not the first device.
COM1
COM4
COM6
COM2
Serial Device
RS485 COM Port
(2 Connectors)
RS485 COM Card
(2 Connectors)
Serial Device
RS232 Port
POWER INTERFACE BOARD
(PIB)
E2 Modem/Expansion
COM Card Mounted
Above PIB
Plug-In
Modem
Card
COM3
E2 Enclosure (Right Side)
RS485
RS232
Figure 9 - Location of E2 COM Ports
