5
Data Communications:
The
Wireless
EZ
Communication Interface transmits and
receives data through an RS-485 communications BUS.
Before wiring, determine which data communication
wiring medium is to be tied to the Wireless
Communication Interface and proceed as follows (Refer
to Setup section for further explanation).
1) RS-485 Connection:
(See Figure 9) The RS-485 pro-
tocol permits network interconnection of multiple
devices such as the control system (
Silo
Track or
HMI
2
), sensors (SMUs or
Flexar
), Auxiliary Output
Enclosures (AOEs) and
Wireless
EZ
Communication
Interfaces. Devices on this “network” are
interconnected in a daisy chain, multi-drop
configuration using a 2-conductor shielded cable
(such as Belden 9322 or Alpha 6302). The order of
connection is not important (i.e.the
Wireless
EZ
Communication Interface can be connected between
SMUs if necessary). The
Wireless
EZ
Communication
Interface creates a “wireless link” that replaces a
section of the RS-485 wiring.
This break in the wiring results in two wired circuits:
a)
The wired circuit connecting the control system
(
Silo
Track or
HMI
2
) and the
Wireless
EZ
Communication Interface,
b)
The wired circuit connecting the second
Wireless
EZ
Communication Interface and the sensors
in the field.
Each wired circuit operates most effectively when the
interconnection has only two ends. “T”s should be
avoided whenever possible. Observe polarity when
making the communication interconnection (D+ and
D-). Attach the cable shield to the "SHD".
Refer to Installation and Operation Bulletin #344J for
connection to the USB serial adapter when
Silo
Track
is
the operator interface.
Summary of Contents for WirelessEZ
Page 6: ...6 Figure 9...
