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Configuration and Use Manual 19
Digital Communications Setup
Installation Using the DisplayDigital Communications SetupBefore You Begin
3.4 Setting up Bell 202 communications
Follow the steps below to set up Bell 202 communications between the Series 3000 device and a
remote device.
1. Locate and identify the primary mA output terminals on the Series 3000 device. Refer to
Table 3-3 and Figure 2-2. Additionally, the Series 3000 device has a label or card that shows
input/output wiring terminal designations. See Figure 2-3.
2. Determine if the primary mA output will be used to report both analog (mA) process data and
HART digital data. It may already be wired for analog output.
3. Using twisted-pair shielded cable, and a signal converter if required, connect the remote device
to the Series 3000 device’s primary mA output terminals. Maximum cable length between the
Series 3000 device and the remote device is 4000 feet (1200 meters).
If the output will be used for HART digital communications only, see the following:
• Model 3300 or Model 3500 with screw-type or solder-tail terminals: Figure 3-4
• Model 3300 or Model 3500 with I/O cables: Figure 3-5
• Model 3350 or Model 3700: Figure 3-6
Additionally, the following wiring examples are provided:
• Using the primary mA outputs for both digital communication and analog output
(HART/analog single-loop wiring) – see Figure 3-7
• Wiring the Series 3000 device to a HART multidrop network – see Figure 3-8
• Wiring for pressure or external temperature compensation – see Figure 3-9
• Wiring the Series 3000 device to a HART Tri-Loop – see Figure 3-10
• Wiring for pressure or external temperature compensation with HART Tri-Loop – see
Figure 3-11
Note: The HART loop is not polarity-sensitive.
4. The HART interface must be connected across a resistance of 250–600 Ω. Add resistance to
the connection if necessary.
5. Configure Bell 202 communications as described in Section 13.4.
Table 3-3 Bell 202 wiring terminals
Model
Primary mA output terminals
location/description
Primary mA terminals
+–
Model 3300 or Model 3500 with
screw-type or solder-tail
connectors
Input/output wiring terminal block c 2 a 2
Model 3300 or Model 3500 with
I/O cable
I/O terminal block on DIN rail 14 15
Model 3350 or Model 3700 Gray terminal block, non-intrinsically safe
wiring compartment
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