4.0 INSTALLATION
This section tells you how to properly connect the Model 2084 to
the RS-232 and RS-485 interfaces, and how to operate the Model 2084.
4.1 CONNECTING THE RS-485 INTERFACE
The RS-485 interface is factory configured as Data Circuit
Terminating Equipment (DCE). Therefore, it “wants” to connect directly
to Data Terminal Equipment (DTE) such as a terminal or PC. If you
must use a cable to connect to the DTE, use a
straight-through cable
no longer than 50 feet.
4.2 CONNECTION TO THE RS-485 INTERFACE
To function properly, the Model 2084
must have one twisted pairs
of metallic wire. This pair must be "dry" (unconditioned) metallic wire,
between 19 and 26 AWG (the higher number gauges may limit distance
somewhat).
For your convenience, the Model 2084 is available with several
different physical interfaces on the RS-485 side: RJ-11 jack, RJ-45
jack, and terminal blocks with strain relief.
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4.2.1 Connecting via the RJ-11 Connector
The RJ-11 version of Model 2084 uses an RJ-11 connector on the
RS-485 side. The RJ--11 connector is prewired for a standard TELCO
wiring environment. The signal/pin relationships are shown below in
Figure 2.
When connecting the
twisted pair cable from the 2084’s RJ-11 jack to
the RS-485 device, your cable must be connected in the manner shown
below.
MODEL 2084
RS-485 DEVICE
SIGNAL
PIN#
RS-485 SIGNAL
GND
*
1
n/c
2
XMT+
3
XMT A
XMT-
4
XMT B-
n/c
5
GND
*
6
*Connection to ground is optional
6
1
2
3
4
5
6
1 Ground
2 (no connection)
3 TX Data + (XMT+)
4 TX Data - (XMT-)
5 (no connection)
6 Ground
Figure 2. RJ-11 Twisted Pair Pin/Signal Relationships
