6
6
a)
The wired circuit connecting the control system
(
Silo
Track
) and the Wireless Communication
Interface,
b)
The wired circuit connecting the second Wireless
Communication Interface and the sensors (SMUs 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".
2) RS-485 Connection:
(See Figure 9) The RS-485 pro-
tocol permits network interconnection of multiple
devices such as the control system (
Silo
Track
), sen-
sors (SMUs), Auxiliary Output Enclosures (AOEs),
Remote Display Units (RDUs) and Wireless Communi-
cation Interfaces. Devices on this “network” are inter-
connected in a daisy chain, multi-drop configuration
using a 2-conductor shielded cable (such as Belden
9322 or Alpha 6302). Order of connection is not impor-
tant (i.e.the Wireless Communication Interface can be
connected between SMUs if necessary). The Wireless
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:
Figure 9
